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مجله علوم کشاورزی ایران | ||
Article 8, Volume 31, Issue 2 - Serial Number 956, April 2000 PDF (621.18 K) | ||
Abstract | ||
How water, as an indispensahk means of subsistence is going to be provided for the future generations. with the ever increasing population, is a serious matter in question. Water crisis is predicted in not far a future due to rise in demand for this vilal life suhslame. Thcrcrore it is not only necessary to have a clear understanding of vater needs m: threct human consumption. agricultural. and industia! projects but to plan ror the most economical and Jficicnt use of water in these areas. Afor the design of pressurized irrigation systems, data are needed regarding crop water us based upon environment, soil. water and climatological conditions. In this study water need in a pressurized irrigation system in Guilan area, mainly Rasht cnvirionmental conditions has been evaluated. In an agicuhural pattern of tea plantation (50%), groves and orchards (16.5%), summer crops (4.5%), forage crops (4%), and dry farming (25%) in Rasht and Foumnat, water need was determined using Blaney and Criddle method. Maximum monthly water need was 210, 115.5, 170, 172 mm for tea, groves and orchards, summer crops and forages respectively, using pressurized irrigation system of 95C;'c, efficiency. Yearly water need is respectively 480, 268, 350 and 430 mm for tea. groves and orchards, summer crops and forages, taking into account the overall efficiency. Net yearly volume of water needed at the beginning of the irrigation netwok for the said plantation pattern is 4257 3m/ha. | ||
Keywords | ||
Average water consumption; Blaney and Criddle method; Cultivation pattern; evapotranspiration; Water need | ||
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