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As the world's population grows and the demand for food increases, the shortage of irrigation water has become the world's main limitation on agricultural production. The most important way to compensate for water scarcity is to make better use of available water resources, increase yield and improve water productivity. Iran is not immune from this problem either. However, detailed information on how and how much water farmers use to produce canola in Iran is not available. Therefore, there is no choice but to conduct field studies to obtain accurate data. In order to determine the amount of applied irrigation water and the yield of canola under farmers management, in the provinces of East Azerbaijan, West Azerbaijan, Ardabil, Tehran, Khorasan Razavi, North Khorasan, Khuzestan, Fars, Kermanshah, Golestan, Zanjan, Hamadan and Gazvin, 267 farms were selected and measurements were performed. Analysis of the results obtained from farmers' farms showed that water productivity, water productivity of water with considering effective rainfall of past 10 years and water productivity of water with considering effective rainfall of research year of canola in selected provinces, had significantly different. Canola seed yield in Iran varied from 700 to 6950 kilogram per hectare, applied irrigation water varied from 184 to 9720 cubic meters per hectare, applied water changed from 2437 to 11383 cubic meters per hectare and water productivity with considering effective rainfall of research year varied from 0.09 to 1.58 kg per cubic meter. Weight averages of yield, applied irrigation water, irrigation water productivity and applied water productivity were 2630 kilogram per hectare, 2807 cubic meters per hectare, 2.27 kg per cubic meter and 0.57 kg per cubic meter, respectively. The lowest and highest average productivity (water with considering effective rainfall of past 10 years) of canola in Hamedan provinces (0.87 kg/m3) and North Khorasan (0.22 kg/m3) and the total average weight of all country was 0.55 kg/m3.
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