The Economic analysis of deficit irrigation management and determination of the optimum depth of irrigation in sunflower plant

Document Type : Complete scientific research article

Authors

1 Assistant professor, Water Engineering Department, Sari Agricultural Sciences and Natural Resources University

2 Associate Professor, Department of Irrigation, Sari Agricultural Sciences & Natural Resources University

Abstract

Water limitation is one of the most factors in preventing for crop production. Therefore, choosing an optimal strategy for the best use of the water is essential in water scarcity condition. To calculate the index and optimal depths of crop water use, and maximizing the profit under deficit irrigation practices, this study was performed in case of randomized complete block design which has 4 treatments and 3 repeats in sari university. The main purpose of this research is Estimating the production function, index and optimal depth and Economic effects of the deficit irrigation on yield production, so functions of production, costs and revenues, and the index optimal irrigation depths were evaluated. The results indicated that the highest yield was 5407 kg per cubic meter, which related to 78 cm of irrigation water depth and the maximum of Net income was 25,201,563 rials with 77.3 cm irrigation water depth. Also results showed that the maximum saved water relative complete irrigation belongs to irrigation equal depth under water limitation. It can be concluded that with the savings of water under deficit irrigation practices, the planting area would increase by 15%. Although the complete irrigation had the maximum yield, but the marginal net profit was not maximum because of the cost rise. The highest earning return under water limitation will be 3362 rails. So aiming to maximize the use of unit volume of water in water limitation condition the optimized irrigation depth would be done 15% less than the complete irrigation.

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