ENERGY USE AND SENSITIVITY ANALYSIS OF ENERGY WITH ECONOMICAL MODELS FOR RICE PRODUCTION IN IRAN SEMI-MECHANIZED SYSTEM

Houshang Bahrami, Fazlollah Eskandari Cherati, Sajjad Barkhordari

Resumen


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.

Uso de energía y análisis de sensibilidad de la energía con modelos económicos para la producción de arroz en el sistema semi-mecanizado de Irán

Resumen

Los objetivos de este estudio fueron investigar las influencias de los insumos energéticos y las formas de energía en los niveles de producción y la evaluación para la producción de arroz en la provincia de Mazandaran, Irán. La sensibilidad de los insumos de energía se estimó utilizando el método de productividad física marginal y los coeficientes de regresión parcial en el rendimiento del arroz. Los datos se recolectaron de 72 granjas de arroz en septiembre de 2016. El volumen de la muestra se determinó mediante un método de muestreo aleatorio. Se encontró que la entrada de energía total era de 61.23 GJ ha − 1 y la salida de energía total se calculó como 139.11 GJ ha − 1. El consumo de energía promedio más alto de los insumos fue para el canal de riego (40.51 GJ ha − 1), que representó aproximadamente el 66% del aporte energético total. La evaluación del modelo econométrico mostró que la energía de la maquinaria fue la entrada más importante que afectó el nivel de salida. Los resultados del análisis de sensibilidad indican que con un uso adicional de 1 MJ de cada maquinaria, se produciría un aumento adicional en el rendimiento en 0.903 y 0.511 kg, respectivamente. La  productividad física marginal del trabajo humano y las semillas fue negativa, ésto puede ser debido a la aplicación constante de las entradas.

 


Palabras clave


Rice, Sensitivity of energy, Cobb–Douglas, Iran. Arroz, Sensibilidad de la energía, Cobb – Douglas, Irán.

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