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Article

Evaluation of the Effects of the Application of Glauconitic Fertilizer on Oat Development: A Two-Year Field-Based Investigation

1
Division for Geology, Tomsk Polytechnic University, 634050 Tomsk, Russia
2
Laboratory of Sedimentology and Paleobiosphere Evolution, University of Tyumen, 625003 Tyumen, Russia
3
Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India
4
Siberian Research Institute of Agriculture and Peat, Branch of the Siberian Federal Science Centre of Agrobiotechnologies, 3 Gagarina st., 634050 Tomsk, Russia
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(6), 872; https://doi.org/10.3390/agronomy10060872
Submission received: 19 May 2020 / Revised: 16 June 2020 / Accepted: 17 June 2020 / Published: 18 June 2020

Abstract

:
This study explores the fertilizer potential of glauconitic soil by monitoring its impact on the growth of plants during the second growing season after application. Our study documents a higher growth of oats (Avena sativa) in glauconitic amended soil compared to that recorded with the control sample at the end of a 97-day-long experiment. Concentrations of nutrients (K, P, ammonium, Ca, Mg) and pH of the soil increase sharply in the first growing season and mildly thereafter, after an initial concentration of 200 g·m−2 glauconite (equivalent to 2 t·ha−1). The pH of the glauconitic-amended soil increases from an initial 6.0 to 6.34 during the second season. Organic matter and nitrates decrease in the soil mixture at the end of the second growing season, while the exchangeable ammonium increases. Organic acids promote the mobility and bioavailability of nutrients in the soil. Glauconitic soil is particularly effective for weakly acidic soils with a low moisture content. The steady increase in total yield and plant height, and the slow-release of nutrients during the second growing season indicates that glauconitic soil can be an effective and eco-friendly fertilizer.

1. Introduction

Basic fertilizers, such as nitrogen, phosphate, and potassium, are commonly used for enhancing agricultural output [1,2,3]. Nitrogen (N)-based fertilizers are the most widely used fertilizer in the world [4,5]. However, the intensive use of nitrogen fertilizers such as urea often results in excess nitrogen in the soil which can contaminate ground and surface water [6,7]. While phosphate and potassium (K) fertilizers are extracted usually from phosphorites and potassic salts, both occur in limited quantities only in Canada, Russia, and Belarus.
Clay minerals [8,9,10] and potash feldspars [11,12] are being explored for agronomic applications as sources of conventional fertilizers are rapidly being depleted. Further, these alternative fertilizers need to be non-polluting. A few studies indicated glauconite as a promising alternate potash fertilizer [13,14,15,16,17,18,19,20,21,22,23,24]; however, its non-polluting nature has not yet been demonstrated.
Glauconite is a dioctahedral micaceous phyllosilicate mineral with interlayer potassium often exceeding 6% [25,26,27,28,29]. It occurs widely in ancient shallow marine deposits [30,31,32,33,34,35,36,37,38,39,40,41,42]. It is widely used in various industries, such as agricultural [13,16,17,20,22,24,43], water treatment [44,45], environmental [46,47], and chemical industries. Agricultural applications of glauconite are as follows: (a) direct application of whole rock to the soil [13,16,17,20,22,24,43]; (b) extraction of potassium salts from the original rocks [14,21,48,49,50,51,52,53,54,55]; and (c) as a component of complex slow-release fertilizers [56].
Experiments with glauconite fertilizer have benefited the growth of plants like olive trees [22], sunflowers [57], grass [17], oats [16], coffee [58], and durum wheat [24]; however, all these studies were short-term, recording the growth of plants during the first season. Long duration experiments are yet to be carried out to record the growth of plants in successive growing seasons and to check the usefulness of glauconitic fertilizer. Recent investigations indicate that glauconite releases a quarter of the total K2O content at the end of the first growing season [24]. Thus, it is reasonable to expect the usefulness of glauconitic fertilizer on soil fertility and plant growth during subsequent growing seasons.
This study aims to document the fate of glauconite fertilizer and its usefulness on the productivity of plants (oats) during a period of two years. We document grain yield, plant height, and the contents of potassium, phosphorus, ammonium nitrogen, nitrate, magnesium, and the pH of the soil during the second growing season to track changes in soil fertility and compare those with the published data of the first growing season. The two-year-long experiment provides information regarding the rate of the release of nutrients and plant growth through time.

2. Materials and Methods

2.1. Samples and Duration of Experiment

Glauconite samples were collected from the Bakchar deposit located at the south-eastern corner of Western Siberia, 200 km west of the town of Tomsk. The detailed geological background of the Bakchar deposit has been provided in the published literature [16,59,60,61,62].
The glauconitic rocks were collected from the core at depths of 201.8–205.0 m [16]. The K2O content of the globular glauconite aggregates was 7.4–7.8%. The glauconite content of the original rock was ~60%. Glauconite was separated from the rock by grinding, followed by sieving and magnetic separation. Glauconite was introduced into agricultural soil as a fertilizer on 1 June, 2018 at a concentration of 200 g·m−2, after which a durum wheat variety was grown for 120 days and its growth recorded [24]. This study was conducted on the same soil for 97 days from 22 June to 27 September, 2019.

2.2. Plant Growth Tests

Field experiments were conducted with oats (Avena sativa) in the Tomsk Region (village of Zyryanskoe, 56°49′18″ N; 86°36′0″ E) with three replications. Rainfall and temperature during the growing season were within the range of normal. The average air temperatures for day and night were 21.2 °C and 15.7 °C, respectively. Glauconitolite introduced into the soil (hereafter referred to as glauconitic soil) one year prior was used as the one treatment and a control (without glauconitolite) served as the second (Figure 1). Six plots were used for the field experiment (1 with glauconitic soil and 1 control × 3 replications). Plots were 1 m long and 1 m wide, and included 5 lines with 40 g·m−2 of oat seeds, with a seed distance of about 5 cm. The control soil had the following initial properties at a depth of 0–30 cm (Table 1): organic carbon 7.29%; pH 6.32; nitrate 20.1 mg·kg−1; ammonium nitrogen 3.5 mg·kg−1; P and K contents of 565 and 426 mg·kg−1, respectively. Meanwhile, the glauconitic soil had the following initial characteristics (Table 1): organic carbon 7.76%; pH 6.11; nitrate 19 mg·kg−1; ammonium nitrogen 3.58 mg·kg−1; P and K contents of 742 and 411 mg·kg−1, respectively. These soils were dark grey and typical of S–E Western Siberia. Grain yield, plant height and protein content were measured after the field test. The protein content was determined using the Kjeldahl Method by multiplying the value of crude protein content by 6.25.
Soil samples were collected on 1, 19, 32, 53, 74, 92 and 97 days after the start of the field experiment. The agrochemical parameters measured in the soil samples each time included the contents of humus using Tyurin’s Method and total nitrogen by the Kjeldahl Method, besides soil pH using the potentiometric method (pH KCl), exchangeable bases (using the trilonometric method), the content of exchangeable cations using ammonium acetate extract, the available phosphorus using Kirsanov’s method, and the available potassium content using flame photometry in an 1 N CH3COONH4 extract [63]. Soil organic matter was determined using the Tyurin titrimetric Method. The soil was oxidized using a 0.2 M potassium dichromate solution with sulphuric acid and heated at the boiling point for precisely 5 min [64].
The data were analyzed using a one-way analysis of variance (ANOVA). Tabulated data are presented as means, with significant differences between fertilizer and the controls indicated by the least significant difference (LSD) with p > 0.05.

3. Results

3.1. Changes in Soil Physico–Chemical Properties

Basic agrochemical characteristics for the control plots and glauconitic soils changed with time after the sowing of oat (Figure 2 and Table 1). The pH of the glauconitic soil increased from 6.11 to 6.34 (standard deviation of 0.09) by the end of the experiment. The pH of the control soil decreased from 6.32 to 6.25 (standard deviation of 0.08). The glauconitic soil showed a marked increase in exchangeable potassium (up to 468 mg·kg−1; Figure 2b) relative to the control soil (up to 425 mg·kg−1). Both soils reflected an increase in exchangeable phosphorus during the growing season, with a maximum concentration of 802 mg·kg−1 in the glauconitic soil (Figure 2c).
The concentration of nitrates gradually decreased in the soils of both plots (Figure 3a). However, the glauconitic soil showed a sharper decrease in nitrates (from 19 to 6.12 mg·kg−1) than the control sample. The concentrations of Ca and Mg varied in the soils. Both were higher in the glauconitic soil than in the control sample. Although the concentration of Ca showed an oscillating trend, it increased in the glauconitic soil from 18.2 to 19.2 mg·kg−1 by the end of the experiment. The Mg content of the soil also showed an oscillating trend (Figure 3d). The Mg content showed a marginal increase from 3.84 to 4.20 mg·kg−1 in the glauconitic soil by the end of the experiment (Table 1), whereas the Mg content decreased in the control soil relative to the initial value from 3.41 to 3.39 mg·kg−1 during the same period.

3.2. Changes in Plant Growth

Grain yield, plant height and protein content of oats (Avena sativa) were higher in the glauconitic soil compared to the control (Figure 4). The glauconitic soil yielded 147 kg·ha−1 of oats on average, which is higher than that of the control soil (134 kg·ha−1). The average height of the plant recorded a sharper increase in glauconitic soil (108 cm) than the control sample (105 cm) (Figure 4b). The average protein content of oats in plots with the glauconitic soil and the control were the same at 16.6% (Table 2).

4. Discussion

4.1. Improvement of Soil Characteristics with Glauconitic Fertilizers

Found in the amended soil, pH, ammonium nitrogen, potassium, phosphorus, calcium, and magnesium content increased by the end of the second field season relative to the initial state. Exchangeable potassium increased by 10.1% relative to the control (Table 1, Figure 2b). Rudmin et al., [24] recorded a 45% increase in exchangeable potassium in the glauconitic soil after the first growing season. Probably, the most accessible potassium gets released from the glauconite structure during the first field season. The structure of glauconite is modified by the expansion of smectite layers during the process of the release of potassium (cf. [65]). An increasing smectite content possibly increases the soil moisture capacity which, in turn, elevates the pH (Table 2, Figure 2a). Glauconite is particularly useful to elevate the pH in the weakly acidic soil of the study area [66].
The content of phosphorus increased during the growing season in both soil plots (Table 1, Figure 2c). The content of phosphorus increased by 9% in glauconitic soil relative to the control sample by the end of the growing season. The phosphorus content in the glauconitic soil remained 51.3% higher compared to the control at the end of the first season [24]. The increase of phosphorus is associated with a rise in the organic acid content, which promotes the transition of phosphorus to a bioavailable and exchangeable form [67,68,69,70].
An increase in ammonium nitrogen by 52.8% in glauconitic soil by the end of the experiment, contrary to its decrease by 5.7% in the control soil, probably relates to a change in the content of organic carbon and nitrates. The organic carbon content decreased by 8.5% in the glauconitic soil, while it remained nearly the same in the control soil. The content of nitrates decreased by 67.8% and 26.9% in the glauconitic and the control soils, respectively, in the same period. The changes in these parameters are related to an increase in organic acids, formed by the decomposition of organic matter. Organic acids facilitate the transformation of nitrates to the exchangeable form (ammonium). The increase in exchangeable Ca and Mg contents in the soils were recorded for potential alternative mineral fertilizers, such as glauconite [24] and basalts [71,72].

4.2. Improvement of Soil Fertility

The yield of oats at the end of the experiment increased in the amended soil relative to the control. The results of the field agrochemical experiment with glauconitic soil, introduced a year ago, show the continuation of the stimulating effect on the growth of oat plants (Figure 4). The average oat yield increased by 10.4% in the plots with glauconite soil (Figure 4a). During the first sowing season, experiments with durum wheat showed an 18.4% increase in the yield [24]. The plant height increased by 3% in plots with glauconitic soil (Figure 4b), while in the first year it recorded a 32.3% increase [24]. The new data reveals that the same glauconitic soil remains an effective fertilizer for two years, although recording a lesser increase in yield and plant height in the next season.

4.3. Advantages of Glauconitic Fertilizer

The solubility of potassium salts is much higher than silicate minerals and, therefore, these are the most used potassium fertilizers [72]. However, the excess salt anions (Cl, SO42−) released during the fast dissolution of salts [17] pollute the environment [73]. Glauconite releases the bioavailable potassium slowly during the growing season [17,20,22,24,57,58] and it contains micro-nutrients such as Ca, Mg, P, Cu, Zn, Cr [16,17,24,53], which also are released into the soil. Other potassium silicates, such as feldspars and feldspathoids [74,75,76,77,78], release potassium very slowly [72] but are devoid of micronutrients. Potassium is released from glauconite faster than other metals [53]. The rate of release of the nutrient is linked to the mineral structure; the strength of the covalent or ionic bond, environmental degradation, particle size, moisture, and the pH of the soil [79]. The rate of release of potassium is higher in the case of phlogopite and biotite in neutral conditions due to fusion between soil water and minerals [10], while the release of potassium from clay minerals takes place at a slower rate under acidic conditions [10,80]. Removal of potassium from the glauconite leads to its sequential transformation into smectite [35,65], which contributes to the retention of soil moisture. Therefore, glauconite fertilizer is particularly suitable for agricultural soils with a low pH and low soil moisture.
The results obtained during the second sowing season are direct evidence that glauconite is an environment-friendly fertilizer that releases K content slowly, but adequately for plant growth. Further studies are necessary to control the rate of release of nutrients from glauconitic soil, as attempted in a few studies [81,82,83,84,85]. The mechanical mixing of glauconite with urea also needs to be explored to reduce the application of traditional fertilizer.

5. Conclusions

Field experiments on the growth of oats during the second growing season after the application of the glauconitic soil revealed the following:
(1) Glauconite maintained improved soil fertility of the soil during the second year. The concentration of nutrients (K, P, N, Ca, Mg) increased gradually in glauconitic soil. The content of nutrients in the soil increased slowly compared to those in the first growing season.
(2) An increase of organic acids in the soil was accompanied by a decrease in the organic carbon content. This correlates with the decrease of nitrates and an increase in ammonium nitrogen. Organic acids contribute to a better intake of nutrients from the soil through the root systems by increasing their mobility and bioavailability.
(3) Plant growth and yield increased in the glauconitic-amended soil compared to the control during the second growing season. However, both these parameters recorded a smaller increase in the second growing season compared to the first year. The protein content of the oats remains the same for two seasons and for all samples.
(4) Glauconite stimulated plant growth for a long duration, releasing its potassium content slowly and, therefore, it can be considered an eco-friendly fertilizer. Glauconitic soil was particularly useful to raise the pH of slightly acidic soil.

Author Contributions

M.R. conceived and designed the study; M.R. and B.M. performed the laboratory investigations; M.R., S.B. and B.M. analyzed the data; M.R. and B.M. contributed materials; M.R. and S.B. wrote the paper. All authors have read and agreed to the published version of the manuscript.

Funding

The reported study was funded by RFBR and DST according to the research project № 19-55-45002.

Acknowledgments

Laboratory investigations were carried out at Tomsk Polytechnic University within the framework of a Tomsk Polytechnic University through the Competitiveness Enhancement Program grant. We thank Associate Editor Sofija Petrovic, and two anonymous reviewers, which very much helped to improve the manuscript.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Photos of the field test showing three plots for control samples to the left and three plots for glauconitic soil to the right. Note the growth of oat plants on day 1, 4, 52 and 87.
Figure 1. Photos of the field test showing three plots for control samples to the left and three plots for glauconitic soil to the right. Note the growth of oat plants on day 1, 4, 52 and 87.
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Figure 2. Cross plots showing changes in pH (a), K content (b), P content (c) and ammonium N (d) of soil versus time during the duration of the experiment, comparing the control and the glauconitic soil. Dashed lines indicate correlation trends.
Figure 2. Cross plots showing changes in pH (a), K content (b), P content (c) and ammonium N (d) of soil versus time during the duration of the experiment, comparing the control and the glauconitic soil. Dashed lines indicate correlation trends.
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Figure 3. Changes of soil nitrate (a), organic carbon (b), Ca (c) and Mg (d) in the soil over the duration of the experiment, comparing the control and the glauconitic soil. Dashed lines indicate correlation trends.
Figure 3. Changes of soil nitrate (a), organic carbon (b), Ca (c) and Mg (d) in the soil over the duration of the experiment, comparing the control and the glauconitic soil. Dashed lines indicate correlation trends.
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Figure 4. Histograms showing changes in grain yield (a), plant height (b) and protein content (c) of oat (Avena sativa) at the end of the 97-day experiment for the control sample and the glauconitic soil. Bars show both minimum and maximum values.
Figure 4. Histograms showing changes in grain yield (a), plant height (b) and protein content (c) of oat (Avena sativa) at the end of the 97-day experiment for the control sample and the glauconitic soil. Bars show both minimum and maximum values.
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Table 1. Agrochemical characteristics of soil (mean 1 ± standard deviation) during plant growth test.
Table 1. Agrochemical characteristics of soil (mean 1 ± standard deviation) during plant growth test.
Soil SampleTime 2pHAvailable K (mg∙kg−1)Available P (mg∙kg−1)Ammonium N (mg∙kg−1)Nitrate (mg∙kg−1)Organic Carbon (%)Available Ca (mg∙kg−1)Available Mg (mg∙kg−1)
Method Potentiometric methodKirsanov’s methodKirsanov’s methodTrilonometric methodKjeldahl’s methodTyurin’s methodKirsanov’s methodKirsanov’s method
Control16.32 ± 0.10426 ± 64565 ± 1133.49 ± 0.5220.1 ± 1.57.29 ± 0.7316.0 ± 1.13.41 ± 0.26
196.13 ± 0.10387 ± 58573 ± 1353.31 ± 0.514.7 ± 1.17.87 ± 0.7916.8 ± 1.32.40 ± 0.18
326.10 ± 0.10365 ± 55507 ± 1014.09 ± 0.6116.4 ± 1.27.71 ± 0.7718.4 ± 1.43.28 ± 0.25
536.19 ± 0.10409 ± 72710 ± 1524.74 ± 0.8316.8 ± 1.37.62 ± 0.7618.9 ± 1.61.88 ± 0.09
746.27 ± 0.10421 ± 63772 ± 1923.79 ± 0.4911.0 ± 0.87.45 ± 0.7417.9 ± 1.32.27 ± 0.17
926.17 ± 0.10392 ± 59737 ± 1233.99 ± 0.6013.6 ± 1.07.31 ± 0.7317.3 ± 1.43.03 ± 0.23
976.25 ± 0.10425 ± 64736 ± 1233.29 ± 0.4314.7 ± 1.17.28 ± 0.7317.1 ± 1.23.39 ± 0.27
Glauconitolite16.11 ± 0.10411 ± 55742 ± 1603.58 ± 0.5419.0 ± 1.47.76 ± 0.7818.2 ± 1.53.84 ± 0.30
196.16 ± 0.10414 ± 56718 ± 1323.62 ± 0.5416.2 ± 1.27.49 ± 0.7517.8 ± 1.33.79 ± 0.28
326.17 ± 0.10426 ± 55743 ± 1494.91 ± 0.8714.8 ± 1.17.94 ± 0.7918.6 ± 1.44.21 ± 0.34
536.12 ± 0.10433 ± 55772 ± 1424.39 ± 0.6610.5 ± 0.87.69 ± 0.7219.3 ± 1.83.66 ± 0.27
746.05 ± 0.10451 ± 53741 ± 1484.88 ± 0.7310.2 ± 0.87.47 ± 0.7518.3 ± 1.43.23 ± 0.23
926.20 ± 0.10432 ± 43778 ± 1305.73 ± 1.017.8 ± 0.67.51 ± 0.7518.7 ± 1.43.53 ± 0.25
976.34 ± 0.10468 ± 48802 ± 1265.47 ± 0.716.1 ± 0.57.10 ± 0.7119.2 ± 1.34.20 ± 0.29
LSD 30.0925900.814.50.290.930.58
1 The means in each column are followed by at least one letter in common and are not significantly different at the 5% level of probability (p ≥ 0.05); 2 Days after plant seeding; 3 LSD—Least significant difference according to a Fisher test (at p < 0.05).
Table 2. Agrochemical parameters of oat growth test.
Table 2. Agrochemical parameters of oat growth test.
Grain Yield (kg∙ga−1)Plant Height (cm)Protein Content (%)
ControlWith GlauconiteControlWith GlauconiteControlWith Glauconite
Average133.7147.5105.1108.516.616.6
minimum129.1145.6101.4106.816.416.5
maximum137.6148.6109.4109.617.016.8
LSD 1 0.7 6.9 0.6
1 LSD—Least significant difference according to a Fisher test (at p < 0.05).

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Rudmin, M.; Banerjee, S.; Makarov, B. Evaluation of the Effects of the Application of Glauconitic Fertilizer on Oat Development: A Two-Year Field-Based Investigation. Agronomy 2020, 10, 872. https://doi.org/10.3390/agronomy10060872

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Rudmin M, Banerjee S, Makarov B. Evaluation of the Effects of the Application of Glauconitic Fertilizer on Oat Development: A Two-Year Field-Based Investigation. Agronomy. 2020; 10(6):872. https://doi.org/10.3390/agronomy10060872

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Rudmin, Maxim, Santanu Banerjee, and Boris Makarov. 2020. "Evaluation of the Effects of the Application of Glauconitic Fertilizer on Oat Development: A Two-Year Field-Based Investigation" Agronomy 10, no. 6: 872. https://doi.org/10.3390/agronomy10060872

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