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The factorial pot experiment was conducted at Bakrajo Research Station,Ministry of Agriculture and Water Resources, Sulaimani Governorate during thewinter growing season from 1/12/2014 to 10/6/2015 for limiting of Fe criticallevel of soils and wheat plant. The pot factorial experiment included the effectof five levels of Fe- EDDHA (0, 2, 4, 6, and 8) mg Fe kg soil-1 , soils of 20locations and their effects on growth, yield and quality of wheat usingcompletely randomized design with 4 replicates. The results indicated to thesignificant effect of applied Fe levels on grain yield of wheat, the highest meanvalue (12.66) g pot-1 was recorded from the second treatment (2 mg Fe kg -1) which ranged between (3.11-28.02) g pot-1 , while the lowest mean value (11.09) g pot-1obtained from the 5 th treatment (8 mg Fe kg -1 ) which ranged between (3.14-27.62) g pot-1 . The critical level of Fe was determined in wheat usinggraphic method and statistical method depending on iron concentration in theplant (mg kg-1 dry weight) and relative yield the iron which was (50.50 mg kg-1dry matter .While the critical level of iron in the studied soil was (2.61) mgkg-1using graphical method and (2.50) mgkg-1 depending on statistical method for the studied soils in Sulaimani governorate.

Determination of iron critical level for main agricultural soils cultivated with wheat (Triticum aestivum L.) in Sulaimani.