Land suitability evaluation in south of Urmieh plain (West Azarbaijan)
2005
Qa`miyan, Nader | Tahmasbi, Kurush | A`mmari, Parviz | Masih Abadi, Mohammad Hasan
Land suitability evaluation has been determined for irrigated wheat,sunflower, sugarbeet and alfalfa in an area about 52000 ha in south of Urmia plain in West Azarbaijan Province. In order to have more confident soil data, particularity to control the old soil map of the area , a new soil survey studies were done.Soils were classified based on soil taxonomy (1998) and 15 families and 31 phases were identified . Climatic data from Urmia synoptic station have been used for climate evaluation of crops . Based on yield coverage and climatic conditions, wheat,sunflower, sugarbeet and alfalfa have been considered and compared in the present land suitability evaluation on the basis of irrigated agricltural system. In this region, the most important limiting land characteristics have appeared to be topography ,drainage limitation,land phisical properties limitation ,soil salinity and alkalinity and soil pH. In surveyed area the climatic classes are suitable(S1) for wheat and sugarbeet and sunflower and moderately suitable(S2) for alfalfa ,Analysis of rainfall and ETO data reveals that the growing period is about 71 days, starting on October 10 until May. Comparing the two parametric methods (ie.storie and square root methods) for determination of land indexes for 4 crops, in all methodes the land indexes for wheat was always higher than those for sugarbeet and alfalfa, the square root method was considered to be more realistic for land suitability evaluation in the studied areas .
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