BANAEIAN N., ZANGENEH M.
Abstract
Production function is one that specifies the output of a firm, an industry, or an entire economy for all combinations of inputs.
The aims of this study were to estimate the production function, to obtain relationship between agricultural inputs and walnut yield
in view of energy inputs, and to make an economical analysis in walnut (Juglans regia) orchards in Hamedan, Iran. For this purpose,
Cobb-Douglas production function method was used. Random sampling technique was used for data collection. Econometric analysis results
revealed that human labour, farmyard manure, chemical fertilizers, water for irrigation and transformation contributed significantly to the yield.
The results of sensitivity analysis of the energy inputs showed that the Marginal Physical Productivity (MPP) value of human labour was the highest,
followed by farmyard manure and water for irrigation energy inputs, respectively. The benefit to cost ratio, mean net return and productivity from
walnut production was obtained as 2.1, 2043.7 $ ha-1 and 0.3 kg $-1, respectively. Based on the results, applying mechanization, mechanical harvesting
and post harvesting such as shaker, sweeper, pickup machine, cracking and handling unit should be developed. They should be based on the physical
characteristics and mechanical properties of walnuts, instead of human labour. Their use in Hamedan walnut orchards can lead to more profit and
energy saving which is highly recommended.
Key words:
Juglans regia; walnut orchards; production function; sensitivity; economic analysis.