S494 : Specification pattern optimum tillage afield varamin per virtual water
Thesis > Central Library of Shahrood University > Agricultural Engineering > MSc > 2019
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Abstarct: The water resources restriction due to the geographical and climatic location of Iran makes the optimal use of available water resources available in the country inevitable. Regarding consumption of more than 80 percent of water resources in agriculture, the optimal cultivating pattern is one of the effective methods for solving water crisis. In order to achieve this goal, the preparation of land use map is one of the necessary measures. Considering that the study of the condition of agricultural lands requires a lot of time and cost, and most of the data are not accurate and practical, today the use of remote sensing data is considered for cost, less time, high accuracy, integrity and broadness compared to other information gathering methods. In this study, cultivating crops and orchards in VARAMIN Plain were determined by remote sensing technology using the ENVI software and Landsat 8 satellite images of OLI sensors and validated by field surveys. Land use map prepared by satellite imagery using SVM was validated by field survey at 1030 points, the results of validation showed a general accuracy of 91.81 percent and Kappa coefficient of 0.89. According to the area under cultivation of each product, the water requirement of the products was obtained by PENMAN-FAO-MONTEITH method, then, considering the performance and water requirement of each product, its virtual water content was calculated. Finally, in order to determine the optimal cultivar pattern, three scenarios with respect to the need for water were reduced by reducing the amount of 10, 20 and 30% of the area under the cultivation of the first three products and increasing its value to the cultivar other products with less water requirements. In all three scenarios, in all cases, total water consumption has decreased while farmer's profit changes have not been clear but in most cases declined. On the other hand, the reduction in water consumption is not significant, and it seems that the recommendation of this scenario is not economically feasible. Also, changing the pattern of cultivation with regard to virtual water was studied in three scenarios in two groups of three and five. In the first scenario, three or five first products with the highest amount of virtual water decreased by 10, 20 and 30 percent, and reduced to other products with virtual water. In the second scenario, the crop cultivations, which consumed more virtual water, reduced by 10, 20 and 30 percent, and added to the three-fold and five-folds to the next category, which had less virtual water than the first one, respectively. In the third scenario, respectively, virtual water drainage is divided into three and five, and each of 10, 20 and 30 percent of the cultivated area is reduced to three or five end products with the lowest amount of virtual water consumption have been added. A total survey of all scenarios showed that the best proposed scenario with the aim of minimizing the water consumption and maximizing the farmers' profit in the area was related to a 30 percent reduction in barley, wheat, alfalfa, and it’s added to tomato, corn, Cantaloupe or Eggplant, Cucumbers and tomato. In the first case, virtual water loss decreased by 12.1 percent and farmer's profit increased 79.3 was percent and the second was the increase of porofit of 42.6 percent, and virtual water decline was 9.14 percent
Keywords:
#Land use mapping #remote sensing technology #Optimum cultivating pattern #Virtual water #VARAMIN Plain
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
Visitor: