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Title

ENERGY MODELING OF PLUM PRODUCTION IN GOLESTAN PROVINCE

Pages

 Start Page 541 | End Page 549

Abstract

 The aims followed in this study were to investigate the energy flow and its modeling for Shablon cultivar of plum production in Golestan Province, Iran. Data were collected through questionnaires as well as interviews with producers. COBB-DOUGLASs model and SENSITIVITY ANALYSIS were used to determine the effects of ENERGY INPUTS on plum yield. The results revealed that the total ENERGY INPUTS and energy use efficiency of plum production in the region were 25870.33 MJha-1 and 1.04, respectively. Diesel fuel and chemical fertilizer, the highest ENERGY INPUTS, carried shares of 33 and 30 percent, respectively. The shares of renewable energy and non-renewable energy of production were recorded as 88 and 12 percent, respectively. The COBB-DOUGLAS model results revealed that the effects of human labor, agricultural machinery, diesel fuel, biocide and farmyard manure were positive on the yield, in contrast, the effect of chemical fertilizer use on plum yield was negative. The results concerning the SENSITIVITY ANALYSIS showed that increasing one unit of MJ in input energies of human labor, machinery, diesel fuel, biocide and farmyard manure led to an additional increase in yield recorded as 0.34, 0.46, 0.12, 0.26 and 0.21 kg, respectively. An increase of one unit of MJ inputin the form of energy of chemical fertilizers led to a decrease in yield of 0.87 kg.

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