فهرست مطالب مصطفی رئیسی اسدآبادی

In order to optimize the irrigation system performance, it is essential to get information about water balance components in the farm. So, the objective of this study was evaluating the performance of the WFD device in determining water penetrated fate in the soil at each irrigation occurrence as one of the important components in evaluating the irrigation water efficiency. By having the water amount infiltrated in the root zone and the deep percolation amount collected and determined by WFD device, contribution of surface losses related to every irrigation occurrence can be determined by the employing water balance equation. This research was carried out in the form of completely randomized design blocks in three replications and under the treatments of 60, 80, 100 and 120% of the irrigation requirement supply of a potato plant in the research farm of Shahr-e Kord University in 2014. To gather the growing season data, before the planting operation, various WFD devices were installed at different depths and locations along furrow. In addition to WFD data, input discharge (using counter), output discharge (measured by flume type 1) and values of soil moisture (theta-probe device) were collected during the harvesting season. The results showed that the mean Nash–Satcliffe coefficient of comparison between the values of calculated and measured surface losses corresponding to it, and also comparison of the values of the calculated and measured residual moisture before each irrigation occurrence were obtained to be 0.87 and 0.98, respectively. Quantity of this indicator in the two conducted comparisons represented the correct and exact performance of the WFD device in the farm operation evaluation. During the farm evaluation process under the experimental furrow, distribution uniformity averages in the experimental treatments were acquired to be 75.56, 83.78, 88.06, and 90.34%, respectively. Likewise, water amount average percolation of root zone (depth losses) in experimental treatments at each irrigation occurrence was measured to be 0.02, 0.07, 0.27 and 0.47m3 for each furrow.

Achieving sustainable water resources has been considered as the biggest challenge of sustainable agriculture among the majority of countries across the world. Obviously, preserving water resources requires optimization of water consumption in different sectors, particularly in agricultural section. This study has been carried out with the aim of water use management reform via applying deficit irrigation techniques in order to promote potato plant productivity and water use efficiency (WUE) indicator in Shahrekord area. Accordingly, management indicator's quantities such as application efficiency, distribution uniformity and irrigation adequacy were measured and compared at the rates 60, 80, 100 and 120 percent supplying conditions of potato water requirement in the form of a complete randomized block design with three replications from June to October 2014. Determining aforementioned management indicators requires sufficient knowledge of the distribution pattern and amount of percolated water. In this regards, mentioned management indicators were determined by designing and installation of the six simple WFD devices at the beginning, middle and end of each furrow in two different depths. The distribution pattern and the amount of percolated water along the furrows were followed, measured and evaluated. Based on the results of this research, the average application efficiency of mentioned water treatments were calculated as 81.26, 68.09, 56.26 and 46.92, respectively. While, the lowest levels of adequacy efficiency and distribution were equal with 86.29 and 75.56% which was related to 60 percent treatment, respectively. Eventually, the findings indicated that irrigation management of potato farm in the study region will bring about the highest water use efficiency (WUE= 1.83KG/M3) with considering MAD of 47 percent and water application equal to 80 percent of water requirement.