Energy efficiency ¼
Total Energy output MJ=ha
ð
Þ
Energy input MJ=ha
ð
Þ
Energy intensity ¼
Energy input MJ=ha
ð
Þ
Total Energy output MJ=ha
ð
Þ
Energy Profitability ¼
Net Energy Ouput MJ=ha
ð
Þ
Energy input MJ=ha
ð
Þ
Energy Productivity ¼
Crop Economic Yield kg=ha
ð
Þ
Energy input MJ=ha
ð
Þ
Classification of Energy
• Direct source: Human, bullocks, mechanical or electric power units and tractors.
• Renewable direct sources: Human, animals, solar and wind energy, agricultural
wastes, etc.
• Non-renewable direct sources: Coal and fossil fuels
• Indirect source: Seeds, manures, chemicals, fertilizers and machinery
• Renewable indirect sources: Seeds and manures
• Non-renewable indirect source: Chemicals, fertilizers and machinery
manufacturing
• Commercial energy: petroleum products and electricity
• Non-commercial energy: Human labour and bullocks
The energy equivalents of various agriculture related inputs and outputs are
collected from many literature (Slesser 1988; Mittal and Dhawan 1988;
Devasenapathy et al. 2009) and are given in Table 13.1.
Inputs Needed for Energy Calculations
• Information on energy sources: Direct/indirect, commercial/non-commercial,
renewable/non-renewable
• Information on type of energy: Human/animal/chemical/machine/bio-products
• Equivalent energy value per unit source
• Quantity of energy source used in each operation
The energy values of different inputs related to agriculture (Table 13.1), sample
energy calculation (Table 13.2) and energy calculation for nutrients (Table 13.3) are
detailed below.
Opportunities and Modules in the TNAU Energy Soft 2016
• Easy selection of input items
• Compare six treatments at a stretch
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G. Dheebakaran et al.