a p; h b
Abstract
The main objective of the present study was determination of the economic value of irrigation water and simulation of the farmers’ behavior in response to reducing available water resources policy in Takestan Township, in Qazvin province. To achieve this goal, we used the positive mathematical ...
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The main objective of the present study was determination of the economic value of irrigation water and simulation of the farmers’ behavior in response to reducing available water resources policy in Takestan Township, in Qazvin province. To achieve this goal, we used the positive mathematical programming (PMP) method and state wide agricultural production (SWAP) functions. First, the economic value of irrigation water in the studied township was determined. Then, framer's response to the scenarios of 5%, 10%, 20% and 30 percent reduction in available water resources was investigated. The required data belonged to crop year 2013-2014. To solve the presented experimental, software GAMS Version 24/1 was used. After solving the model, the economic value of irrigation water in Takestan Township was calculated at 1690 Rial. The results showed that there was huge difference between the economic value of irrigation water and water charge rates in this township. In addition, the results showed that with reduction in irrigation water availability in Qazvin, economic value of irrigation water increases and farmers' gross profit decreases. Finally, in order to avoid the indiscriminate use of water in agriculture sector, it is recommended to determine water charge for farmers of Takestan Township according to trend of changes in economic value and considering equity.
a p; m s; m a; h b
Abstract
To be safe from the risks of drought and water crisis in the future, it is necessary to follow the guidelines and rules for proper utilization of limit water resources. In this regard, using deficit irrigation strategies creates a balance between water use and the available resources (rivers, groundwater ...
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To be safe from the risks of drought and water crisis in the future, it is necessary to follow the guidelines and rules for proper utilization of limit water resources. In this regard, using deficit irrigation strategies creates a balance between water use and the available resources (rivers, groundwater and dams) and also causes the optimization of water use in agriculture. In this study, in order to assess the effects of deficit irrigation on cropping patterns and farmers’ gross profit in Qazvin province, first, agricultural production functions based on three techniques of full irrigation, 5% deficit irrigation and 10% deficit irrigation were estimated. Then, optimal cropping patterns were determined by using a non-linear programming model in Qazvin province. In the end, the effects of deficit irrigation with irrigation water reduction under scenarios of 10%, 20%, 30% and 40% were investigated on cropping pattern and farmers' gross profit simultaneously. Agricultural production functions were estimated by using Ordinary Least Squares method and Eviews software. Also, the non-linear programming model in GAMS software was solved. Results of the estimation of production functions showed that 5% deficit irrigation technique creates a slight decrease in crops yield. But, 10% deficit irrigation technique has negative impact on yield of most crops. The results of non-linear programming model showed that, although simultaneous application of deficit irrigation technique and irrigation water reduction policy reduces the farmers' gross profit, but it helps to maintain the sustainability of groundwater and surface water resources in Qazvin province.