شماره مطلب: 411

Energy balance in Iran’s agronomy (1990–2006)

نویسنده: 
Iman Beheshti Tabar
انتشارات: 
elsevier
تعدات صفحات: 
7
In this study data from 17 years (1990–2006) were collected to determine energy intensive areas andevaluate energy parameters of Iran’s agronomy sector. All the direct and indirect inputs of energy for theproduction of 19 agricultural commodities were evaluated. The inputs and outputs were calculated bymultiplying the amounts of inputs and outputs by their energy equivalents. The results indicated thattotal energy input increased from 32.40 GJ ha1 in 1990 to 37.20 GJ ha1 in 2006. At the same period,total output energy increased from 30.85 to 43.68 GJ ha1. The results show that irrigation with 40.0%and fertilizer (28.4%) had the highest share in energy consumption. The average net energy gain was apositive value; however, about 87% of the input energy emanates from non-renewable sources of energy.The mean energy ratio was estimated to be 1.07 and showed an increasing trend during the period risingfrom 0.95 in 1990 to 1.17 in 2006. This indicates that increased use of inputs ha1 in production wasaccompanied by a larger increase in the output levels. It can be inferred from the results thatimprovements in irrigation and fertilizer application can significantly affect the energy efficiency ofIranian agriculture.
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