Azam Rezaee; ramtin joolaie; ALI keramatzadeh
Abstract
Sustainability of water resources has the most important role in the sustainability of agricultural systems. In this study, positive mathematical programming was applied in 2018-19 to evaluate the sustainability of water resources and to determine the cropping pattern in Golestan province based ...
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Sustainability of water resources has the most important role in the sustainability of agricultural systems. In this study, positive mathematical programming was applied in 2018-19 to evaluate the sustainability of water resources and to determine the cropping pattern in Golestan province based on water demand management policies, i.e. water price increase by 50% and 100%, and reducing water quota by 10% and 20%. First, according to water price increases and water quota policy scenarios, the cropping pattern was evaluated in this area. Then, by using the sustainability indicators such as gross margin (GM), water consumption, economic efficiency, and labor efficiency the sustainability of water resources was calculated. Based on water price increases by 50% and 100%, water consumption and GM decrease by, respectively, (2.72% and 5.44%) and (5.06% and 9.99%). Also, based on water quota policy of 10% and 20% reduction, water consumption and GM decrease by, respectively, (8.9% and 11.56%) and (0.54% and 1.75%). In addition, GM per unit of water in agricultural sector decreases by 2.41% and 4.81% in response to to water price increase by 50% and 100%, respectively, and in case of 10% and 20% reductiion in water quota policy, it increases by, respectively, 9.17% and 11.09%. Water price increase by 50% and 100% and water quota reduction by 10% and 20%, increase water labor efficiency by, respectively, (0.78% and 1.6%) and (2.6% and 5.8%). Based on the result, if the government is going to increase water sustainability by using demand management policies, the water quota policy is more efficient. Also, the government should support farmers by direct payments to compensate for their lost profits.It is also recommended that irrigation methods with high efficiency be employed.
Somayeh Shirzadi; Mostafa Mardani; Ali Shahnazari
Abstract
Water supply and demand Management plays an important role in the agricultural sector. In recent years, due to inadequate management of agricultural water distribution, agricultural lands in Tajan Irrigation and Drainage Networks are suffering from excessive use of groundwater and salinity. Therefore, ...
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Water supply and demand Management plays an important role in the agricultural sector. In recent years, due to inadequate management of agricultural water distribution, agricultural lands in Tajan Irrigation and Drainage Networks are suffering from excessive use of groundwater and salinity. Therefore, the purpose of this study was to investigate the sustainability of groundwater, water consumption, and distribution management in Tajan Irrigation and Drainage Network after implementing water-pricing policies and reducing available water of upstream lands. For this purpose, Positive Mathematical Programming model and the Asano sustainability index were used. The required data were collected from Agricultural Jihad Statistics, direct referral to Jihad-e-Agriculture Organization and Mazandaran Regional Water Company in years 2016 and 2017. The results showed that the situation of water resources in the region is not stable, while changing the cropping pattern and adopting different irrigation policies in the region will increase the sustainability of water resources from 0.45 to 0.27, which corresponds to changing from critical to good situation. The higher price policy for water up to 30% compared to the current conditions has little effect on irrigation water use. However, reducing available water of the upstream lands, in addition to reducing the amount of consumed water and managing its consumption, would improve the economic benefits of the network, with a minimum reduction in the upstream economic benefits. Therefore, in order to contribute to the sustainability of groundwater in the region, it is suggested that managers of the Tajan Network should adopt the policy of reducing available water to the upstream lands.
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.