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Review

Sustainable and Low Greenhouse Gas Emitting Rice Production in Latin America and the Caribbean: A Review on the Transition from Ideality to Reality

by Ngonidzashe Chirinda 1,*, Laura Arenas 1, Maria Katto 1, Sandra Loaiza 1, Fernando Correa 1, Manabu Isthitani 1, Ana Maria Loboguerrero 1,2, Deissy Martínez-Barón 1,2, Eduardo Graterol 3, Santiago Jaramillo 3, Carlos Felipe Torres 4, Miguel Arango 5, Myriam Guzmán 6, Ivan Avila 6, Sara Hube 7, Ditmar Bernardo Kurtz 8, Gonzalo Zorrilla 9, Jose Terra 9, Pilar Irisarri 10, Silvana Tarlera 11, Gabriel LaHue 12, Walkyria Bueno Scivittaro 13, Aldo Noguera 14 and Cimelio Bayer 15add Show full author list remove Hide full author list
1
Centro Internacional de Agricultura Tropical (CIAT), Palmira 6713, Colombia
2
Consultative Group on International Agricultural Research (CGIAR) Research Program on Climate Change, Agriculture and Food Security (CCAFS), Palmira 6713, Colombia
3
Fondo Latinoamericano para Arroz de Riego (FLAR), Palmira 6713, Colombia
4
Instituto de Hidrología, Meteorología y Estudios Ambientales (IDEAM), Bogotá, 111711, Colombia
5
Corporación Colombiana de Investigación Agropecuaria (CORPOICA), Via Puerto López 502007, Colombia
6
Federación Nacional de Arroceros (FEDEARROZ), Bogotá 111831, Colombia
7
Instituto de Investigaciones Agropecuarias (INIA), Santiago 7083150, Chile
8
Instituto Nacional de Tecnología Agropecuaria (INTA), Corrientes 3400, Argentina
9
National Agricultural Research Institute (INIA), Treinta y Tres 33000, Uruguay
10
Department of Plant Biology, College of Agriculture, University of the Republic, Montevideo 12900, Uruguay
11
Department of Biosciences, College of Chemistry and Science, University of the Republic, Montevideo 11800, Uruguay
12
Department Plant Sciences; Land, Air and Water Resources, University of California, Davis, CA 95616, USA
13
Embrapa Clima Temperado (CPACT), Pelotas, RS 96010-971, Brazil
14
Ministerio de Agricultura y Ganadería (MAG), Asunción 1329, Paraguay
15
Department of Soil Science, Universidad Federal de Río Grande del Sur (UFRGS), Porto Alegre, RS 91540-000, Brazil
*
Author to whom correspondence should be addressed.
Sustainability 2018, 10(3), 671; https://doi.org/10.3390/su10030671
Submission received: 24 November 2017 / Revised: 27 January 2018 / Accepted: 23 February 2018 / Published: 1 March 2018

Abstract

:
The burgeoning demand for rice in Latin America and Caribbean (LAC) exceeds supply, resulting in a rice deficit. To overcome this challenge, rice production should be increased, albeit sustainably. However, since rice production is associated with increases in the atmospheric concentration of two greenhouse gases (GHGs), namely methane (CH4) and nitrous oxide (N2O), the challenge is on ensuring that production increases are not associated with an increase in GHG emissions and thus do not cause an increase in GHG emission intensities. Based on current understanding of drivers of CH4 and N2O production, we provide here insights on the potential climate change mitigation benefits of management and technological options (i.e., seeding, tillage, irrigation, residue management) pursued in the LAC region. Studies conducted in the LAC region show intermittent irrigation or alternate wetting and drying of rice fields to reduce CH4 emissions by 25–70% without increasing N2O emissions. Results on yield changes associated with intermittent irrigation remain inconclusive. Compared to conventional tillage, no-tillage and anticipated tillage (i.e., fall tillage) cause a 21% and 25% reduction in CH4 emissions, respectively. From existing literature, it was unambiguous that the mitigation potential of most management strategies pursued in the LAC region need to be quantified while acknowledging country-specific conditions. While breeding high yielding and low emitting rice varieties may represent the most promising and possibly sustainable approach for achieving GHG emission reductions without demanding major changes in on-farm management practices, this is rather idealistic. We contend that a more realistic approach for realizing low GHG emitting rice production systems is to focus on increasing rice yields, for obvious food security reasons, which, while not reducing absolute emissions, should translate to a reduction in GHG emission intensities. Moreover, there is need to explore creative ways of incentivizing the adoption of promising combinations of management and technological options.

1. Introduction

Rice production is increasing in Latin America and the Caribbean (LAC), as the crop is now classified as both a staple and a cash crop in several countries [1,2,3]. Currently, rice is grown in 26 LAC countries under diverse production systems and agro-climatic conditions [4]. In the LAC region, rice production over the period 2010–2012 is reported to have averaged 26 million tonnes [5], which translates into an estimated US 8.8 billion dollars in revenue [6]. The regional per capita rice consumption increased from 9 kg of milled rice in 1924–1928 to about 30 kg in 2008–2010 [2]. To meet increased regional demand for rice, there has been an increase in both productivity (yield per unit area) and planted area [6] however, with a net rice deficit of over 1 million tonnes, the LAC region remains a net rice importer [4,5]).
In the LAC region, irrigated rice, rain-fed lowland rice and upland rice are responsible for about 59%, 22%, 19% of total rice production in the region respectively [2]. Further expansion of rice production is still possible in countries such as Colombia and Venezuela, which have substantial land and water resources [7]. There is also a possibility to expand lowland rice production to wetlands in Brazil, Bolivia, Ecuador, Peru, Venezuela, Argentina, Paraguay, Uruguay, Guyana and Central America [2]. However, as irrigated and lowland rice production expands, an increase in CH4 emissions is expected.
Irrigated lowland rice production is a significant anthropogenic source of methane (CH4) and nitrous oxide (N2O), two important greenhouse gases (GHGs). Methane, which accounts for 20–30% of the global warming effect, is second only to carbon dioxide (CO2) as the most significant GHG [8]. Methane from rice fields represents about 10% of non-CO2 emissions from agriculture [8] and about 89% of the global warming potential (GWP) from rice [9]. The current understanding of the mechanisms responsible for soil CH4 dynamics, including the influence of soil properties and dynamic conditions, has been documented in several previous reviews [10,11,12]. Basically, the source or sink strength of an environment depends on the balance between methanogenesis and methanotrophy. Methanogenesis is the dominant process under flooded conditions, while CH4 consumption becomes more important in drained soils. The CH4 that is released to the atmosphere escapes through three pathways: diffusion of dissolved CH4 gas, loss through ebullition (gas bubbles), and mainly (80–98%) by plant transport through the aerenchyma [13,14,15]. Variations in the quantities of CH4 emitted from rice production systems depend on variations in the amounts of labile carbon from root exudates, sloughed root cells, mucilage and litter (the main sources of substrate for methanogenesis), soil oxygen dynamics, soil characteristics such as iron oxides and nitrogen content and differences in rice aerenchyma structure [13,16,17,18]
In addition to CH4 emissions, agricultural soils contribute approximately 60% of anthropogenic N2O emissions, which account for about 6% of total anthropogenic radiative forcing [19]. Several previous reviews give detailed accounts on the mechanisms responsible for soil N2O dynamics [20,21,22]. Under flooded conditions, soil N2O emissions are generally lower than those from aerobic soils as, in the former, denitrification tends to be complete, thus releasing dinitrogen (N2) gas [9]. In addition, if urea, ammonium or ammonia-based fertilizers are applied, the flooded conditions may prevent nitrification and thus limit substrate availability for denitrification and therefore N2O emissions. Draining of paddy rice fields may increase N2O losses by increasing nitrification and incomplete denitrification [15,23,24,25]. A recent study conducted in Uruguay (Illarze et al. [26]) highlighted that soil type and drainage management had a strong influence on soil N2O emissions. Specifically, soils with higher organic matter content exhibited higher denitrifier activity and thus showed higher soil N2O emissions. End of season drainage also resulted in high soil N2O emissions.
To reduce the rice deficit in LAC and increase food security, the region needs to further increase the area under rice production and/or increase productivity. However, it is important that increased rice outputs are not associated with increases in GHG emissions. This is particularly important if we consider that, under the 2015 Climate Agreement, several LAC countries have committed to reduce their economy-wide GHG emissions, including those from the agriculture sector [27]. However, we must hasten to mention that reductions in yield-scaled GHG emissions will not necessarily enable countries to reach their IPCC targets unless absolute emissions also decline.
In recent years, there has been an increase in the number of studies aimed at quantifying GHG emission from rice systems in LAC [25,28,29,30,31,32,33]. The aim of this review is to explore the state of knowledge of GHG emissions and mitigation strategies for rice systems in LAC. Besides identifying pragmatic options for reducing GHG emissions from rice production systems, we aim to understand knowledge gaps in the GHG mitigation potential of rice systems in LAC and discuss possibilities for making rice production systems in LAC more sustainable.

2. Contrasting LAC to Asia Rice Production Systems

In this review, we will compare and contrast the LAC region with Asia—the most important rice growing region in terms of both the area under rice production and the volume of rice produced [2]. Table 1 shows rice statistics for the five main rice producer countries in Asia and LAC [2,34].
The size of farm holdings among rice farmers in Asia is generally smaller (<5 ha per household) than the predominantly highly-mechanized commercial farms of LAC (>10 ha per household) [2]. In both regions, a variety of land preparation techniques ranging from no-tillage, minimum tillage, dryland conventional tillage (i.e., disc plowing and leveling operations) and wet tillage (puddling) are practiced by rice producers. Generally, conventional tillage on dry soil conditions is common in LAC while puddling is common in Asia. The LAC farmers mainly practice direct seeding and those in Asia predominantly practice the labor-intensive rice transplanting system. In both regions, quantitative estimates of rice straw amounts and utilization are limited. Nonetheless, rice straw is mainly either burnt (through open-field burning or used as a fuel for cooking) or incorporated into the soil and to a limited extent used for field mulching, animal bedding or livestock feeding [35].
An overview on GHG emissions and emission intensities from rice production systems in Asia and LAC was determined using FAOSTAT data [5] (Figure 1). Emissions reported in Figure 1 were quantified using activity data disaggregated into irrigated, rain-fed and upland water regimes. Where available, country specific emission factor (EF) values were used [36]. For Asian countries with no default EF value, an area-weighted average EF (15.7 g CH4 m−2 yr−1) was used. For the LAC region, the global Intergovernmental Panel on Climate Change (IPCC) EF value (20 g CH4 m−2 yr−1) was used. The EF values were modified by the application of a scaling and correction factor for water regimes and organic amendments, respectively. According to FAOSTAT, a scaling factor of 0.7 was used for rain-fed rice and 0 for upland rice or dry conditions [37]. In addition, for the FAOSTAT data, a default correction factor of 2 was used for organic amendments for all countries [37] Results from this very coarse data suggest that emissions are lower in Brazil that in the other major rice producing countries in Asia and LAC. However, results from field studies conducted in the LAC region indicate wide variation in methane emissions (0.3–64 g CH4 m−2 yr−1) suggesting that over-reliance on the IPCC’s default emission factors may either overestimate or underestimate GHG emissions from rice production systems in the different LAC countries. In the next section, we will discuss how several of the technological options and management practices used by rice farmers may influence GHG emissions in LAC countries.

3. Mitigation Actions That Have Been Studied in LAC

3.1. Soil Tillage Practices

To the best of our knowledge, the effect of tillage systems on GHG emissions from rice fields has been investigated in LAC in only three studies conducted in Brazil. In one of these studies that was conducted in the state of Goiás, a clayey Oxisol reported a 39% reduction in CH4 emissions in no-tillage compared to disc-ploughed plots [38]. Two of the studies were conducted on a loamy soil in Southern Brazil, and they report a potential to mitigate CH4 emissions by 21% with adoption of a no-till system and by 25% with fall tillage in comparison with the spring conventional tillage [31,32]. Bayer et al. [31,32] concluded that biomass incorporation under spring conventional tillage is the main cause of the higher CH4 emissions, implying that rice production systems where residue incorporation is excluded (no-till) may contribute to mitigation of GHG emissions from South Brazilian rice fields. The same conclusion resulted from the anticipation of conventional tillage (plow and disking) from spring to fall, where a significant portion of labile C from rice straw is decomposed under aerobic soil conditions during the off-season (fall and winter), which produces CO2 emissions and decreases the amount of available labile C to act as substrate for CH4 production under flooded conditions [32].There is also evidence in the literature that suggests that soil compaction in no-till soils may increase the soil residence time of CH4 thus increasing the probability of its oxidation by methanotrophic bacteria and reducing emission through the rice plant [39]. Similarly, studies conducted in other regions have also reported significant reductions in CH4 emissions (21–60%) from no-till compared to tilled fields [40,41]. Ali et al. [42] report further reductions (54%) of CH4 emissions from no-till fields when soils were amended with silicate fertilizer.
Bayer et al. [31] observed similar soil N2O emissions under no-till and conventional tillage systems. This result corroborates Zhang et al. [43], who reported similar N2O emissions under no-till and conventional tillage in a field experiment conducted in the Jiangsu province of China. However, for a study conducted in the Hubei Province of China, N2O emissions were 33% higher in fertilized no-till compared to fertilized conventional tillage fields [41]. The authors attribute the higher soil N2O emissions in the no-till systems to fertilizer exposure on the soil surface, resulting in increased nitrification, and also higher denitrification due to higher soil bulk density (lower total pore volume) and, possibly, increased anaerobic conditions in the topsoil.
Statistics on the extent of the different types of tillage practices conducted by rice farmers in LAC countries are limited. However, about 50% of the cropping area under no-tillage is reported to be in the LAC region where some countries have about 70% of their total cultivated area, including rice fields, under no-tillage [44]. This implies that both the knowledge and the technical capacity to conduct no-tillage farming exist in the region. Considering that no-tillage systems have the potential of reduce CH4 emissions from rice fields, quantification of the area under this practice and other tillage systems would enable better estimates of tillage induced regional emissions from the rice sector.

3.2. Nitrogen Fertilizer Management

The application of nitrogen (N) fertilizer to agricultural soils increases productivity and may also influence GHG emissions from rice systems. In a meta-analysis conducted by Linquist et al. [45], N fertilizer-induced N2O emissions were reported to be 0.21% under continuous flooding and 0.40% under alternate wetting and drying (AWD) rice production systems. In the same meta-analysis an effect of fertilizer type was reported, with N2O emissions shown to increase by 24% and CH4 emissions to decrease by 40% when urea was replaced by ammonium sulphate. However, in soils under irrigated rice, the relationship between N fertilizer and CH4 is multifaceted [46]. Nitrogen fertilizer increases plant growth and may also increase the quantity of crop residues and root exudates which supply carbon substrate for methanogenesis [46,47]. Moreover, similarities in size and structure between CH4 and NH4+ may result in the latter inhibiting CH4 consumption [48]. In a field experiment conducted in China, increasing the rates of ammonium sulphate and urea fertilizer from 100 to 300 kg N ha−1 decreased CH4 emissions by 30 and 7%, respectively [49]. However, a decrease in CH4 emissions with high N application rates may show tradeoffs with an increase in N2O emissions, demonstrating the complexity of interactions between N-fertilization and CH4 emissions [50].
In the LAC region, research on N management has focused on increasing N use efficiency. For instance, a study conducted in Uruguay focused on exploring the N2O mitigation potential of a nitrification inhibitor used in rice fields, and showed a decrease in N2O emissions and nitrate content in soil about 30 days after sowing; however, in the same study, cumulative N2O emissions for the first 35 days were not significantly different between systems with and without nitrification inhibitors [51]. Additionally, in Brazil, evaluations related with N losses from ammonia volatilization and response to use of a urease inhibitor in rice fields were conducted by Scivittaro et al. [52], who reported that the urease inhibitor can reduce the ammonia volatilization by 83 to 88% in muddy and moist soils. A greenhouse experiment conducted in Uruguay reported that early flooding in combination with nitrogen fertilization tends to increase soil N2O emissions [30]. In the same study [30], there was evidence that the use of cover crops (i.e., ryegrass) in combination with fertilization may increase GHG emissions during the rice production cycle.

3.3. Water Management

Water management influences rice production and CH4 and N2O emissions from rice systems. Single or multiple drainages during a rice growing season (e.g., AWD) are reported to reduce CH4 emissions by 48 to 93% compared to those observed under continuous flooding systems [53,54,55,56,57]. Several studies conducted in LAC have reported a decrease in CH4 emissions for AWD compared to continuous flooding: in Uruguay a 55% decrease was observed [58] and in Brazil a 25–45% decrease was seen with intermittent irrigation [25,29]. A recent study conducted in Colombia reported a 70% decrease [33]. The reduction in CH4 emissions has been attributed to changes in soil redox conditions [29,59].
The few studies conducted in LAC corroborate with studies conducted in other regions, which show that AWD water management results in a reduction in CH4 emissions from irrigated rice production systems [15,60,61,62]. A recent incubation study suggests that the structure of soil microbial communities, which changes with water management histories, also affects GHG production [63]. Specifically, Lagomarsino et al. [63] report less abundant methanogens in soils that were never subjected to flooding, which suggests the possibility of decreasing long-term CH4 emissions by adopting management practices that rotate irrigated rice with aerobic crops. Rotating irrigated rice with aerobic crops and pastures, which has several inherent challenges related to managing for different soil properties (e.g., compaction, drainage), has been done in some LAC countries such as Uruguay, Argentina and Brazil. However, GHG emissions from these systems are yet to be adequately quantified.
Although several studies have reported similar N2O emissions from soil under either AWD or continuous flooding [53,58,61,64], trade-offs between CH4 and N2O emissions have also been widely reported [49,61,65]. To concurrently reduce CH4 and N2O emissions and, consequently, the GWP of irrigated rice, both water and nitrogen inputs need to be optimized [63]. Therefore, to obtain a more holistic view, future studies in LAC should simultaneously, explore the influence that water and N fertilizer management practices have on GHG emissions.
In Asia, though the mitigation benefits associated with AWD are well documented, adoption of this water management practice by farmers is still limited despite the many dissemination efforts [66,67]. For instance, Lampayan et al. [68] report that, since 2002, approximately 2% of the Philippines’ total rice area had adopted AWD. In Bangladesh, where AWD was introduced in 2004 and implementation began in 2007, no mass uptake of the technology had been observed by 2010 [69]. One of the main challenges of AWD is related to the possibility of yield reductions, if it is not implemented properly (e.g., if drying is done during critical stages of the plant growth cycle such as flowering). To avoid yield penalties associated with AWD, there is need to improve awareness on good water scheduling approaches and explore new irrigation techniques that allow for proper timing of drying. In addition, weed management needs to be adequately adjusted under AWD in order to avoid competition from weeds that are normally suppressed with continuous flooding [70]. More importantly, to promote adoption of AWD, there is need to create an enabling environment with regards to policy and the necessary infrastructure for water pricing delivery and control by farmers [67]. A study conducted in China reported that AWD was adopted on about 40% of the rice growing area [71]. It appears that water pricing mechanisms, whereby water is priced on a volumetric rather than an area basis, were critical factors in incentivizing the wide-spread adoption of AWD in China. Similar proposals have been made to incentivize AWD adoption in LAC [33], however, as is the case in China, a change in the pricing mechanisms would require strong political will.
The mitigation potential of other water management practices pursued in the region is yet to be quantified. For instance, in Argentina, farmers are generally recommended to suspend irrigation 15–20 days after flowering [72], a management practice that enables farmers to save water and money and may reduce CH4 emissions. Another example is in Colombia, where under the massive technology adoption programme (AMTEC by its Spanish acronym) led by the National Federation of Rice Producers (FEDEARROZ by its Spanish acronym), farmers are encouraged to avoid flooding their fields but to keep their soils saturated throughout the rice growing season by controlled irrigation (similar to aerobic rice) [73]. Recent reports show that at least one component of the AMTEC package had been adopted on about 56% of the rice growing area [74]. The avoidance of flooding, which is part of the AMTEC package, may lead to a reduction in CH4 emissions; however, these presumed emission reductions are yet to be validated through field measurements.

3.4. Residue Management

The amount of rice produced in LAC is estimated at 28 million tonnes, mostly from improved short varieties [34,75]. Since the grain to straw ratio of rice ranges from 0.5 for traditional tall varieties to 1.0 for improved short varieties [76], we can assume that similar amounts of straw (28 million tonnes) are produced. With only 4.2 percent of world rice production [77], the LAC region definitely produces less straw than Asia, which may in turn influence GHG emissions. The incorporation of rice residues contributes toward long-term nutrient cycling but may, due to high C/N ratios, cause short-term N immobilization and thus affect N availability for subsequent crops [78,79]. In a pot experiment conducted in Brazil, Zschornack et al. [80], demonstrated that, compared to residue incorporation, leaving cover crop residues (ryegrass and serradella) on the soil surface minimizes both soil CH4 and N2O emissions from irrigated rice. In the same study crop residue type had no significant effect on CH4 but on N2O emissions [81]. The open burning of crop residues emits CO2, CH4 and N2O, with the magnitude of these emissions depending on straw moisture content at the time of burning [81].
Globally, there is limited published work on GHG emissions from open air burning of agricultural residues. Several cases studies have used the IPCC guidelines, where open burning emissions can be estimated by multiplying the quantity of rice straw subject to open burning with a combustion factor (fraction of the mass combusted during the course of a fire) and emission factors of the different GHGs [82]. While we are not aware of any research in the LAC region that has determined region-specific GHG emission factors from open burning of rice straw, we would not expect GHG emissions from open burning of straw to vary much across regions. However, we expect within the region variations in GHG emissions to be related to differences in straw moisture content as influenced by harvest time, post-harvest rainfall and burning time.
Timing of straw incorporation has been shown to influence CH4 emissions and can be managed to reduce CH4 emissions during the rice growing season [83,84]. Specifically, CH4 emissions have been reported to increase when crop residues are incorporated prior to planting, due to higher amounts of readily available carbon stimulating soil microbial activity [78,85,86,87,88,89] An approach for reducing the amount of CH4 associated with straw incorporation was reported by Sander et al. [84], in a study conducted in Los Baños, Philippines. In this work, the strategy of incorporating rice residues immediately after harvest and subsequent aerobic decomposition of the residue before soil flooding (for the next crop) reduced CH4 emissions by 2.5 to 5 times and also improved nutrient cycling.
As mentioned earlier, the incorporation rice straw immediately before planting negatively affects rice yields due to high N immobilization [79]. This implies a double negative effect of straw incorporation prior to planting the next crop: higher CH4 emissions and lower yields [90]. On the other hand, early incorporation of straw has been reported to be an effective way of increasing soil fertility and reducing CH4 emissions [89]. For example, in the Corrientes region which produces 40% of Argentina’s rice [2], straw from about 85% of the planted area is incorporated with disks after harvest which could lead to aerobic decomposition and thus could mitigate CH4 emissions, as previously reported in the Philippines [84]

4. Mitigation Actions That Have Not Been Studied in LAC

4.1. Cultivar Choice

No studies have been conducted on varietal differences in CH4 or N2O emissions in LAC. Nonetheless, several previous studies conducted outside of LAC have observed inter-varietal differences in CH4 emissions from rice fields [13,18,91,92,93]. The varietal differences in emitted CH4 are regulated by the amount of root exudates and degrading roots which influence substrate (i.e., carbon) availability [94]; tiller numbers, leaf area and quantity [95,96]; grain starch content [97]; duration in the field [98] and aerenchyma structure which affects methane transport from the soil to the atmosphere [99]. In contrast, studies conducted outside of LAC have found no varietal differences in soil N2O emissions [93]. Even though about 80% of the total N2O produced in the soil is known to be transmitted through the rice aerenchyma, under flooded conditions [14,100], (the low redox potential, under these conditions is associated with complete denitrification, which probably masks cultivar-based differences. However, several of these studies have also reported inconsistencies across sites and seasons suggesting a stronger influence from the environment.
Zheng et al. [101] reported significantly higher yield-scaled GWP in the Indica (1101.72 kg CO2 equiv. Mg−1) compared to Japonica (711.38 kg CO2 equiv. Mg−1) race. They attribute these differences to dissimilar gas transport capacity among these two rice races. The fact that Indica rice varieties are more common in the LAC region suggests a possibility of higher GWP for rice produced in LAC compared to rice produced in Asia, where Japonica rice varieties are common. Research should aim to identify high-yielding rice cultivars with low GWP. This approach is probably the most effective option for mitigating CH4 emissions as, unlike other approaches, it does not require significant changes in farmer practices [102].

4.2. Seeding Practices

Direct seeding, whereby seeds are sown in well-prepared dry soil or in association with zero or minimum tillage, is common in LAC [6,103]. Unlike transplanted rice, direct seeding is known to have economic and logistical advantages as it is associated with a reduction in labor costs, field preparation, water demand and nursery establishment [104,105]. It also implies 20 to 40 fewer days of soil saturation by flooding compared with transplanting, directly reducing the favorable conditions for methanogenesis. Evidence from previous studies conducted in Asia suggest that CH4 emissions associated with direct seeding are 8–92% lower than those under transplanted rice [106,107]. In addition, CH4 emission reductions have been observed to be higher for dry-direct seeding compared to wet-direct seeding, a difference which can be attributed to dissimilar periods when fields are subjected to dry conditions [107]. The prevalence of dry direct seeding systems in LAC may lower CH4 emissions relative to Asia, where transplanted rice is common. We are not aware of any studies that have compared greenhouse gas emissions form direct seeding and transplanted rice in the LAC region.

5. Summary and Future Perspectives

In summary, since research on GHG emissions from the rice sector in LAC is still limited to a few countries and management practices (Table 2), there is evidently a need for more research to cover existing information gaps on the environmental impacts of other rice management practices conducted in the region. Since rice production systems and conditions in LAC vary greatly between countries, it is difficult to generalize mitigation actions. Partners in the Global Research Alliance Americas sub-group are exploring the possibility of multi-nation projects to simultaneously quantify the mitigation potential of promising management options. Such studies are expected to provide insights on regional and site-specific variations in GHG emissions.
In our opinion, idealistically, the most effective mitigation strategies should be based on identifying or breeding low-emitting rice varieties. Compared to other management practices, for which adoption could be costly for the farmer, changing seed choices may be easier to implement, especially if the new varieties also have traits for increased productivity (high rice grain harvest index) and adaptation to climate change impacts (e.g., heat stress, water scarcity). Such robust rice varieties would be key to realizing an eco-efficient rice production. While developing rice varieties with ideal characteristics (high yielding and low emitting) is an attractive option, this approach is currently in the realm of ideality and is currently difficult to realize due to the resource-demanding process of variety development. In the short-term, a more realistic approach is that research conducted in the LAC region should continue focusing on increasing rice yields, which we expect to translate into less GHG emissions per kg of rice produced (emission intensity). Focus should also simultaneously be placed on exploring and quantifying the climate change mitigation potential of different technologies and management practices that are currently pursued in the region and elsewhere. A modelling study conducted in Argentina found that, in rice production systems, lower emissions can be achieved through a combination of management practices including conventional tillage, optimal sowing dates, commencing irrigation 10 days after sowing, maintaining a 10 cm layer of water during the whole growing period and optimal fertilization [108]. More creative approaches as are being pursued in countries such as Argentina, where there are plans to explore the mitigation potential of alternating rice-fish productions systems on current rice fields should also be encouraged.
We anticipate that increasing consumer awareness and influencing consumer preferences towards more sustainably produced rice will also contribute towards incentivizing the adoption of good management and technological choices. However, for these changes to occur, there is a need for improved integration of rice value chain actors. We therefore suggest that rice stakeholders, in all rice-growing LAC countries, may need to invest in exploring creative ways of combining technological, management and policy innovations to ensure that future efforts, from land preparation to rice consumption, aim to both increase productivity and reduce GHG emissions along the rice value chain. Finally, multi-stakeholder platforms such as the Latin American Irrigated Rice Fund (FLAR by its Spanish acronym) should consider working to improve documentation of adoption rates for promising mitigation actions.

Acknowledgments

This work was implemented as part of the Global Research Alliance Paddy Rice Americas sub-group; the Climate and Clean Air Coalition (CCAC); and CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS), which is carried out with support from CGIAR Fund Donors and through bilateral funding agreements. For details, please visit https://ccafs.cgiar.org/donors. The views expressed in this document cannot be taken to reflect the official opinions of these organizations.

Author Contributions

As this article contains a review of literature on different aspects of rice production and climate change mitigation and adaptation, authors participated in reviewing literature on different aspects covered in this review: contrasting LAC to Asia rice production systems; soil tillage practices; cultivar choice, seeding practices; nitrogen fertilizer management, water management and straw management. Specifically, the authors contributed as follows: Contrasting LAC to Asia rice production systems—N.C., S.L., L.A., M.K., M.I., G.Z. and S.T.; Soil tillage practices—N.C., S.L., L.A., I.A., S.H. and C.B.; Cultivar choice—L.A., G.Z., S.H., F.C., P.I. and S.T.; Seeding practices—C.B., S.H., L.A. and F.C.; Nitrogen fertilizer management—M.A., I.A., D.B.K., S.T. and P.I.; Water management—G.L., S.J., C.F.T., G.Z., D.B.K. and W.B.S.; C.B., S.H., J.T., and Straw management—M.A., D.B.K., P.I., J.T. and W.B.S. In addition, N.C., A.N., D.M.-B., A.M.L., E.G., M.G. and G.L., contributed towards the introduction as well as the summary and perspective sections.

Conflicts of Interest

The authors declare no conflicts of interest.

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Figure 1. Mean methane emissions per unit rice production and per area in the main rice producing countries in Asia and Latin America and the Caribbean. These values were generated using rice statistics from FAOSTAT [5], which were disaggregated according to irrigated, rainfall and upland water regimes.
Figure 1. Mean methane emissions per unit rice production and per area in the main rice producing countries in Asia and Latin America and the Caribbean. These values were generated using rice statistics from FAOSTAT [5], which were disaggregated according to irrigated, rainfall and upland water regimes.
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Table 1. Mean (2004–2014) rice statistics in the main rice producer countries in Asia and Latin America and the Caribbean (LAC) (Source: FAOSTAT, [35]).
Table 1. Mean (2004–2014) rice statistics in the main rice producer countries in Asia and Latin America and the Caribbean (LAC) (Source: FAOSTAT, [35]).
CountryHarvested AreaTotal ProductionYieldsCH4 Emissions
(million ha)(million tonnes)(tonnes ha−1)(tonnes CH4 ha−1)
India431463.40.11
China291956.50.18
Indonesia12634.90.21
Bangladesh11464.20.10
Viet Nam7405.30.18
Brazil2124.30.06
Colombia0.524.60.21
Peru0.437.20.24
Argentina0.216.60.28
Uruguay0.217.60.28
Table 2. Greenhouse gas emission reductions and yield changes observed in studies on climate change mitigation options for rice production systems in Latin America.
Table 2. Greenhouse gas emission reductions and yield changes observed in studies on climate change mitigation options for rice production systems in Latin America.
Agronomic PracticeReferenceCountryTreatmentsMitigation Strategy AssessmentGHG Reduction (%)Yield Change (%)
CH4N2O
Soil tillageBayer et al. [32]BrazilCT vs. NTNo tillage213−2
Bayer et al. [33]BrazilST vs. FTFall tillage24-+4
Metay et al. [39]BrazilOFF vs. DMCDMC3911-
Water managementTarlera et al. [59]UruguayCF vs. AWDAWD57–62-−8.2–−16
Moterle et al. [30]BrazilCF vs. IIII25-<1
Zschornack et al. [26]BrazilCF vs. II regimesII47–7137–70−1
Chirinda et al. [34]ColombiaCF vs. AWDAWD7241-
Nitrogen fertilizerIrrisarri et al. [31]UruguayRCF vs. RCRC5064−11
Domínguez et al. [52]UruguayUrea-F vs. F + INENTEC-NS−18
Residue managementZschornack et al. [81]BrazilResidues incorporated in soil vs. residues left on soil surfaceleft on soil surface6971–94-
CT: Conventional Tillage; NT: No-Tillage; ST: Spring Tillage; FT: Fall Tillage; OFF: Offset or disc arrowing treatment in which soil was tilled only to 15 cm depth; RC: Rice without fertilization but with cover crop; RCF: rice with cover crop + fertilization; Urea-F; Urea fertilization; ENTEC (fertilizer containing nitrate, ammonium and the nitrification inhibitor DMPP); NS: no significant difference; DMC: Direct Seeding Mulch based treatment with cover crops; CF: Continuous Flooding; AWD: Alternate wetting and drying; II: intermittent irrigation; IN: Nitrification inhibitor. For yield change, a negative sign indicates yield reduction while a positive sign indicates a yield increase.

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Chirinda, N.; Arenas, L.; Katto, M.; Loaiza, S.; Correa, F.; Isthitani, M.; Loboguerrero, A.M.; Martínez-Barón, D.; Graterol, E.; Jaramillo, S.; et al. Sustainable and Low Greenhouse Gas Emitting Rice Production in Latin America and the Caribbean: A Review on the Transition from Ideality to Reality. Sustainability 2018, 10, 671. https://doi.org/10.3390/su10030671

AMA Style

Chirinda N, Arenas L, Katto M, Loaiza S, Correa F, Isthitani M, Loboguerrero AM, Martínez-Barón D, Graterol E, Jaramillo S, et al. Sustainable and Low Greenhouse Gas Emitting Rice Production in Latin America and the Caribbean: A Review on the Transition from Ideality to Reality. Sustainability. 2018; 10(3):671. https://doi.org/10.3390/su10030671

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Chirinda, Ngonidzashe, Laura Arenas, Maria Katto, Sandra Loaiza, Fernando Correa, Manabu Isthitani, Ana Maria Loboguerrero, Deissy Martínez-Barón, Eduardo Graterol, Santiago Jaramillo, and et al. 2018. "Sustainable and Low Greenhouse Gas Emitting Rice Production in Latin America and the Caribbean: A Review on the Transition from Ideality to Reality" Sustainability 10, no. 3: 671. https://doi.org/10.3390/su10030671

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