Houshang Bahrami, Fazlollah Eskandari Cherati, Sajjad Barkhordari


The aims of this study were to investigate influences of energy inputs and energy forms on output levels and evaluation of inputs sensitivity for rice production in Mazandaran province, Iran. The sensitivity of energy inputs was estimated using the marginal physical productivity (MPP) method and partial regression coefficients on rice yield. Data were collected from 72 rice farms in September 2016. The sample volume was determined by random sampling method. Total energy input was found to be 61.23 GJ ha−1 and total energy output was calculated as 139.11 GJ ha−1. The highest average energy consumption of inputs was for Irrigation canal (40.51 GJ ha−1) which was accounted for about 66% of the total energy input. Econometric model evaluation showed that the machinery energy was the most significant input affecting the output level. Sensitivity analysis results indicate that with an additional use of 1 MJ of each machinery and Toxin energy, would lead to an additional increase in yield by 0.903 and 0.511 kg, respectively. The MPP of human labor and seeds was negative. It can be because of applying the inputs more than required or improperly applying.

Palabras clave

Rice, Sensitivity of energy, Cobb–Douglas, Iran

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