Energy Use Patterns of Pearl Millet ( Pennisetumglaucum (L.)) Production in Haryana, India

: Pearl millet ( Pennisetumglaucum (L.)) is the ﬁfth most important cereal crop in the world after rice, wheat, maize and sorghum. A resolution adopted by the UN General Assembly on 3 March 2021 decided to declare 2023 as the International Year of Millets. Millet has been promoted due to its nutritional value and low irrigation requirement. In this study, pearl millet was selected for energy auditing, and its production amount is a direct function of energy input. The production of pearl millet needs to be augmented to fulﬁll an increasing demand. Pearl millet is produced using various sources of energy. This study was conducted to examine the energy use pattern of different categories of farmers, such as small, medium and large, for pearl millet production in Hisar district, Haryana, India. The energy was distributed in different operations, including preparatory tillage, sowing, interculture, fertilizer, irrigation, pesticide, harvesting, threshing and transportation. The source-wise energy (direct and indirect) and operation-wise energy consumption were calculated for all categories of farmers. The average energy input of small, medium and large farmers was 2849.09 MJ.ha − 1 , 3027.21 MJ.ha − 1 and 4021.50 MJ.ha − 1 , respectively. The highest energy was consumed in fertilizer application (52%), with the lowest in seed (2%). The energy ratios of small, medium and large farmers were 3.92, 9.40 and 13.80, respectively. This study could improve the agricultural production systems of pearl millet regarding the energy values of the inputs and outputs.


Introduction
Since the age of subsistence agriculture, one of the most precious inputs in the agricultural system has been energy. It is a fact that globally, the production of crops is positively interlinked with energy input [1]. The need for energy in different aspects of agriculture is different owing to variations in the level of technology adopted by farmers and various agro-climatic conditions. In developed countries, the enhancement of crop yields was predominantly due to improved crop varieties and increased commercial energy inputs [2]. Energy is consumed as well as produced in the agriculture sector. It uses massive amounts of locally offered non-commercial energy (seed, manure and animate energy), commercial energy and direct and indirect energy (electricity, diesel, fertilizer, plant protection, chemical, irrigation water and machinery, etc.) [3]. The efficient use of this energy aids in realizing enhanced production and productivity, which shares the benefits and competitiveness of agriculture sustainability in rural living [4]. Energy use in agriculture is increasing in response to the growing global population, restricted supply of cultivable land and the will for higher living standards [5].
Today, the world has reached a peak where energy is becoming the main cost factor in almost all processes in daily life [1]. Apart from this, energy and profit in many organi-zations are closely related to the fact that energy audits and finance are fully interlinked. Most organizations are vulnerable to tracking energy monitoring and thus consume more energy than the energy required for the ideal work [6].
Pearl millet, also known as Bajra, is one of the main kharif crops in the arid and semi-arid farming regions of India [3]. It is the first in the millet category in India in terms of production, productivity and area. in the states of Rajasthan, Uttar Pradesh, Maharashtra, Haryana and Gujarat, pearl millet accounts for more than 90% of the total area and contributes to similar production levels [7]. According to FAO, millet production in the world is 89.17 million metric tons from an area of 74 million hectares [7]. India is the largest producer of pearl millet in the world, which has an area of 12.53 million hectares and produces 15.53 metric tons per year, with an average productivity of 1237 kg/ha throughout 2021-2022 [8]. In India, pearl millet comprises around 7.4% of the area, while in the case of production, it comprises nearly 3.4% of the total food grain of the country [9]. Pearl millet is examined as a "poor man's" crop, and it is rich in carbohydrates, protein, fat, fiber and mineral content [6]. In Haryana, during 2016-2017, pearl millet was grown in an area of 0.48 million ha with production and average productivity of 0.98 MT per year and 2017 kg/ha, respectively [10]. The states that grow pearl millet in India are Rajasthan, Uttar Pradesh, Maharashtra, Haryana and Gujrat [6]. As an important food crop of Haryana (India), there is an urgent need to assess the energy utilized in producing pearl millet. It also works as a raw material for cattle feed and cattle fodder [6].
The efficient use of available natural resources, proper energy management/conservation and minimization of energy losses throughout different unit operations of pearl millet production could be performed. Pearl millet is grown in the rainfed areas of Mahendergarh, Bhiwani and Jhajar, and in the case of the Hisar and Fatehabad districts of Haryana, it is grown under irrigated conditions.

Materials and Methods
A brief description of study area, methodology adopted for data collection and the procedure used for data analysis are presented in the following sections.

Selection of Work Area
A village in the Hisar district was selected to study energy use patterns in pearl millet production in an irrigated area of Haryana.

Selection of the Farmers
The farmers were grouped into three categories, viz., small (0.2-0.4 ha), medium (0.4-1 ha) and large (>1 ha) based on land holdings. Different unit operations for pearl millet production were studied regarding energy use patterns at the selected village of Dhigtana.

Collection of Data
A questionnaire (Appendix A) was prepared for collecting data through a face-to-face interview schedule from farmers regarding different operations and quantities of each input (i.e., machinery, fuel, fertilizer, pesticide, irrigation water, labor, etc.).

Tools of Analysis
Source-wise (direct and indirect) and operation-wise energy auditing for pearl millet production were studied in the selected region. Direct energy sources subsumed human, animal and diesel energy, while indirect energy sources included fertilizer, pesticide, seeds and machinery. Energy equivalents of various energy sources are given in Tables 1 and 2. The following unit operations performed during pearl millet production were observed in the selected village. Different operations performed were preparatory tillage, sowing, interculture, irrigation, fertilizer application, pesticide application, harvesting, threshing and transportation.

Source-Wise (Direct and Indirect) Energy Inputs
Source-wise (direct and indirect) energy inputs are given in the following sections.

Direct Energy Inputs
Direct energy inputs are defined as input energy per hectare during pearl millet production; i.e., human (manual), animal energy and fuel energy, were calculated using the following equations [11][12][13].

Energy Analysis
After collecting data regarding different unit operations in pearl millet cultivation, calculations were made regarding energy use efficiency, energy productivity, energy ratio and net energy gain. The values of these energy sources were obtained from the literature [16][17][18][19].

Energy Use Efficiency
Energy ratio or energy use efficiency was calculated as the ratio of the output and input energy from pearl millet production. After converting the yield into energy, output was calculated by multiplying it with its energy equivalent [19,20].

Energy Productivity
Energy productivity (kg.MJ −1 ) is defined as the ratio of the total amount of grain yield and the total energy input of harvested product.

Net Energy Gain
Net energy gain (MJ.ha −1 ) is defined as the difference between output and input energy.

Specific Energy
Specific energy (MJ.kg −1 ) is the ratio of amount of energy consumed to produced grain yield.
Cobb-Douglas model was used in the present study to develop a model in Microsoft Excel to analyze the relationship of energy inputs and yield for pearl millet production. The developed model was validated for the pearl millet production data collected for the irrigated region of Haryana. The objective of production function was to analyze the efficiency of all operations utilized in the production process, such as preparatory tillage, sowing, interculture, harvesting, threshing, etc.
The usual form of production function [21,22] is given as: The function is easy to estimate in logarithmic form as: indicated independent variables including preparatory tillage (X 1 ), sowing (X 2 ), interculture (X 3 ), irrigation (X 4 ), fertilizer application (X 5 ), Pesticide application (X 6 ), harvesting ( Figure 1 shows the total energy used and yield obtained during pearl millet production for different categories of farmers. It was found that large farmers consumed the highest energy (402.50 MJ.ha −1 ) while small farmers consumed the least energy (28,493.09 MJ.ha −1 ), which indicated the dependency of energy utilization on the size of the farms and their level of production activities. The productivity of small, marginal and large farmers in irrigated areas was 19.00 q.ha −1 , 21.50 q.ha −1 and 23.12 q.ha −1 . The productivity depended on variety and seed rate.

Operation-Wise Energy Use Pattern in Pearl Millet Production
Fertilizer energy was highest among all the operations in all categories of farmers, followed by preparatory tillage. It was highest in large farmers, followed by medium and small farmers. This indicated that as farm size increased, fertilizer application increased, followed by preparatory tillage ( Table 3).
The energy consumption of fertilizer by medium farmers was lower than by small and large farmers because some marginal farmers did not apply fertilizer in their fields. These findings were similar to the ones reported by Yadav et al. (2013) [19].
Medium farmers consumed more irrigation energy than small and large farmers because all the marginal farmers performed irrigation operations, but some of the small and large farmers performed irrigation while others depended on rain.  The fertilizer consumption of small, medium and large farmers was 1533.02 MJ.ha −1 , 1115.04 MJ.ha −1 and 2206.00 MJ.ha −1 , which showed that fertilizer application was lower in the case of medium farmers than small and large farmers because a lesser amount of fertilizer (urea) was applied by them than the recommended dose. None of the farmers applied pesticide. Fertilizer consumed 52% of the total energy, followed by diesel (30%), human (8%), animal (5%) and seed (2%). This trend was similar to [12,21,23,24]. The diesel energy consumed by small, medium and large farmers was 886.84 MJ.ha −1 , 1238.32 MJ.ha −1 and 1316.65 MJ.ha −1 , which showed that as the farm size increased, the use of diesel fuel, hence machinery, also increased. The fertilizer and fuel consumption share were similar to the results reported by [12,25].

Operation-Wise Energy Use Pattern in Pearl Millet Production
Fertilizer energy was highest among all the operations in all categories of farmers, followed by preparatory tillage. It was highest in large farmers, followed by medium and small farmers. This indicated that as farm size increased, fertilizer application increased, followed by preparatory tillage ( Table 3).
The energy consumption of fertilizer by medium farmers was lower than by small and large farmers because some marginal farmers did not apply fertilizer in their fields. These findings were similar to the ones reported by Yadav et al. (2013) [19].
Medium farmers consumed more irrigation energy than small and large farmers because all the marginal farmers performed irrigation operations, but some of the small and large farmers performed irrigation while others depended on rain.  Figure 2 indicates that indirect energy played a major role in energy consumed in the total energy consumption compared to direct energy, as small and large farmers used the higher fertilizer application. This was due to their higher dose of fertilizer application than recommended. This was a shared waste of energy, which did not result in higher crop yield. These results were similar to the ones in the literature [19,21,22]. In case of medium farmers, the utility of direct energy was higher due to more fuel consumption than indirect energy. The findings are similar to [26,27].

Variation of Direct and Indirect Energy
World 2023, 4, FOR PEER REVIEW 8 yield. These results were similar to the ones in the literature [19,21,22,]. In case of medium farmers, the utility of direct energy was higher due to more fuel consumption than indirect energy. The findings are similar to [26,27].  Table 4 indicates that the energy use ratio for different farmers varied from 3.92 to 13.80. High energy ratios of 9.40 and 13.80 in large farmers indicated efficient energy. The findings are similar to [28] since they used a higher utilization of mechanical energy. The lowest energy ratio of 3.92 was found in small farmers, indicating low energy output level as compared to input. The energy productivity of different categories of farmers was computed to be 0.    Table 4 indicates that the energy use ratio for different farmers varied from 3.92 to 13.80. High energy ratios of 9.40 and 13.80 in large farmers indicated efficient energy. The findings are similar to [28] since they used a higher utilization of mechanical energy. The lowest energy ratio of 3.92 was found in small farmers, indicating low energy output level as compared to input. The energy productivity of different categories of farmers was computed to be 0.  The results in Table 5 indicate that 78% (R 2 = 0.78) of the variation in gross return was explained by seven variables in all the categories of farmers. It can also be seen that the sum of elasticities (∑b i = 1.45) did not significantly deviate from unity, indicating an increasing return to scale. It showed that for pearl millet production, interculture had the highest impact (0.80) among the other inputs. The elasticity for interculture is 0.80, indicating that a given change (1%) in human energy will conclude in a 0.80% enhancement in yield. Some other important inputs were harvesting, sowing and preparatory tillage with elasticities of 0.56, 0.18 and 0.067, respectively. The sum of the regression coefficients of the energy consumption was examined as 1.45, which implied that a 1% increase in the total input energy would result in a 1.45% increase in the grain yield. Table 5. Econometric estimation of pearl millet production. This indicated that the production function showed an increasing return to scale, which implied that if total energy inputs specified in the function were increased by 100%, then income would be enhanced by about 78%. The results are similar to the findings of (Wongnaa and Ofori, (2012); Akighir and Shabu, (2011) and Goni et al. (2007)) [29][30][31], who had observed an increasing return to scale on cashew production, tank command farming system and rice production, respectively, in Ghana, India and Nigeria. Figure 1 shows fertilizer had the highest energy share, followed by seed and machinery among indirect energy sources. The fertilizer contribution of small, medium and large farmers was found to be 1533.02 MJ/ha, 1115.04 MJ/ha and 2206 MJ/ha, respectively, which shows that fertilizer application was lower in the case of medium farmers than small and large farmers because a smaller amount of fertilizer (urea) was applied than the recommended dose. This is similar to research reported by Abubakar and Ahmad (2010) [32]. Human energy increased with increasing land holding because two operations of interculture and harvesting were performed manually. Diesel had a big share of direct energy sources; it contributed 31%, 39% and 32% of direct energy in the case of small, medium and large farmers. Machine energy also followed the same trend as observed in the case of the rainfed area. Small farmers used higher seed rates as compared to large farmers. There is lot of variation in the variety of seeds used by farmers of the irrigated area. Pesticide application was not performed by any of the farmers of the irrigated area. Machinery consumed more energy in the case of small farmers, as some used less efficient animal-drawn machinery than large farmers who used efficient tractor-drawn machines such as cultivators, harrows and rotavators for tillage. Table 3 indicates that energy used by fertilizer was also highest among all the operations in all categories of farmers, followed by preparatory tillage and sowing in irrigated regions. These results were similar with the research reported by Abubakar and Ahmad (2010) [32]. The energy consumption of fertilizer in the case of medium farmers was lower as compared to small and large farmers because some medium farmers did not apply fertilizer in their fields. Small and medium farmers applied urea at the rate of 50-60 kg/ha, while large farmers applied urea at the rate of 60-90 kg/ha. Sowing and interculture followed a similar trend as preparatory tillage. Human energy increased with increasing land holdings. Irrigation energy was consumed more by medium farmers than small and large farmers because all the medium farmers performed irrigation operations, but in the case of small and large farmers, some performed irrigation while some left this operation and depended on rain only. Small farmers applied pesticide while the medium and large farmers did not. The energy consumed in harvesting operations increased as the size of the farm increased. A similar trend was also observed in the case of threshing. Large farmers consumed more energy in preparatory tillage, sowing, interculture and harvesting operations than medium and small farmers. This trend was similar to the research findings reported by Shahin et al. (2008); Pimentel and Pimentel (1996) and Walsh et al. (1998) [33][34][35], who suggested that energy consumption depended on farm size and the level of production activities. Figure 2 indicates that the indirect form of energy was found to be the major contributor of energy in total energy consumption, compared to direct energy, due to the higher doses of fertilizer application. The shares of indirect energy sources were more than direct energy in small and large farmers. Small and large farmers used higher doses of fertilizer compared to medium farmers.

Variation of Indicator of Energy Usage Efficiency for Different Categories of Farmers
The net energy yield of small, medium and large farmers of irrigated regions was 8339.13 MJ/ha, 25,416.58 MJ/ha and 51,542.39 MJ/ha. This means that the output energy was more than the input energy of pearl millet production. The energy use ratio for different categories of farmers varied from 3.92 to 13.80. A high energy ratio indicates an efficient level of energy usage. The findings are similar to the results of Sidhpuria et al., 2014 [29], who conducted work on resource conservation practices in rainfed pearl millet. This could be attributed to large farmers' higher use of manual and mechanical energies. The lowest energy ratio was obtained for small farmers, indicating low energy output level as compared to input, while the energy productivity of different categories of farmers of irrigated regions was calculated to be 0.21 kg/MJ, 0.65 kg/MJ and 0.92 kg/MJ. The values of medium and large farmers are similar to the findings of Yadav and Khandelwal, 2013 [19], who reported on wheat production in the state of MP (India).

Conclusions
The input energy of all farmers (small, medium and large) was 2849.09, 3027.21 and 4021.50 MJ.ha −1 , while the output was 11,172.00, 28,518.00 and 55,566.00 MJ.ha −1 . The energy ratios were 3.92, 9.40 and 13.80 for small, medium and large farmers. The energy productivity was 0.21 kg.MJ −1 (small), 0.65 kg.MJ −1 (medium) and 0.92 kg.MJ −1 (large). Manual energy increased with the size of land holding, indicating more labor work done by small farmers compared to larger ones. This indicated that large farmers used less labor to perform different operations, which took more time and energy. Based on the source-wise energy use pattern, the fertilizer application source was found to be the most energy-consuming, which increased with the size of land holding. Additionally, as the size of the farm increased, animal energy increased with land holding size, indicating less use of animal-drawn implements. A similar trend was observed for diesel fuel consumption. Seed energy decreased with the size of landholdings in both areas, indicating the higher use of seed by small farmers. None of the farmers applied pesticide (Atrazine) for pearl millet production.
This study will provide valuable information to farmers, scientists and policymakers, allowing them to recommend appropriate changes in agricultural practices that would result in substantial energy savings in the pearl millet production system, reducing the cost of operation and sustainable development. It will also give useful information to decision-makers and farmers, emphasizing the necessity of energy management in crop production. The amount of energy input and output differed by the category of farmers, geographical location and economic condition of farmers.