كاربرد تحليل كم¬آبياري و منحني¬هاي آيزوكوانت براي بهينه¬سازي آب آبياري و كود نيتروژن براي جو

علوم و مهندسي آب گرايش آبياري و زهكشي

10/22/2022 12:00:00 AM

Water and nitrogen are two main limiting factors in achieving the potential performance of agricultural products. The limitation of these two factors is due to their lack of resources or environmental considerations. The growing crisis of the quantity and quality of water resources made researchers think about optimizing its use in agriculture as the most consuming part of human societies in terms of water. Irrigation deficiency analysis is a practical strategy and an economic method in achieving the optimal pattern of water consumption. In this model, an algorithm for optimizing irrigation water consumption for the maximum use of a unit of water volume in two situations of land and water limitation is presented using product production function and cost function. The analyzes of this research were done based on the yield data obtained from two years of barley cultivation using saline water for irrigation and in accordance with the theoretical principles mentioned for the analysis of insufficient irrigation and isoquant curves, and the optimal amounts of water and nitrogen fertilizer consumption were determined. The results showed that with the aim of achieving the maximum yield per unit area based on low-irrigation analysis, the amount of irrigation water and nitrogen consumption was obtained as 0.788 m and 173 kg per hectare, respectively. In the conditions of limited land, the optimal amounts of irrigation water and applied nitrogen were calculated as 0.706 m and 170 kg per hectare, respectively, which has decreased by 10.4% and nitrogen consumption by 1.6% compared to the state of the maximum crop. The optimum amount of nitrogen was obtained in the condition of water limitation, similar to the condition of land limitation, while the optimum amount of irrigation water was obtained with a 22.8% reduction compared to the condition of the maximum crop to the amount of 0.608 m. The condition of land and water limitation has increased the net profit per surface unit by 5.4% and decreased by 2.4%, respectively, so that in the condition of land limitation, the maximum income per surface unit has been obtained. The optimization of production factors with the method of identical production curves led to almost the same results as with the method of economic analysis of scarce irrigation. In this method, drawing the development path showed that in the production process of barley product, the role of water is much more than that of nitrogen consumption.

227596

دانشگاه اردکان

يرمي نجمه Yarami Najmeh