Land suitability evaluation in Miyandoab plain (West Azarbaijan
2008
Ghaemiyan, Nader | Seyed Jalali, Seyed Alireza | Ammari, Parviz | Tahmasebi, Korosh
Land suitability evaluation has been determined for irrigated wheat, sugarbeet and alfalfa in an area about 113000 ha in Miyandoab 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 F.A.O soil classification and 14 families and 42 phases were identified . Climatic data from Miyandoab synoptic station have been used for climate evaluation of crops . Based on yield coverage and climatic conditions, wheat, 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 ,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 moderately suitable(S2) for alfalfa ,Analysis of rainfall and ETO data reveals that the growing period is about 138 days, starting on October 10 until May. the parametric methode (ie. square root methode) for determination of land indexes for 3 crops, in this methode 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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