Abstract
Energy inputs and crop yields of rice by 209 farmers from three villages were collected over 2 years and analysed. Relations were found between crop yield and tillage, irrigation, fertilizers, and pre-harvest or total energy inputs. The 209 farmers were divided into 25 homogeneous groups by using a cumulative cube method for the input-energy level. There are quadratic relations between rice yield and pre-harvest energy input. The yield shows Robb's parabolic relation with irrigation, fertilizer and total energy input.
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