EVALUATION OF AVAILABLE POTASSIUM DETERMINATION METHOS FOR DIFFERENT TEXTURE SOILS

	EVALUATION OF AVAILABLE POTASSIUM DETERMINATION METHOS FOR DIFFERENT TEXTURE SOILS
Diyala Agricultural Sciences Journal
Article 1, Volume 5, Issue 1, 2013, Pages 91-104
Abstract
Determination of available K conducted by different methods. In Iraq; ammonium acetate (1M) consider the most widely used methods while few others prefer 0.5M CaCl2 method. Implementations of suitable assessment for available K consider an important task to evaluate the amount of K fertilizer that should apply to soil. Therefore both methods (NH4OAc and CaCl2) were investigated and compared with third suggested method (1M NaOAc) which considers a suitable technique to evaluate the available K in some investigation. Capacity of soils to release K was investigated in laboratory experiment. characterized by different texture class collected from Aurafia , Yousifiya and Jaderia. 100g of the same soils used in experiment were treated with different concentration of K (0 ,50 ,100 and 150 Kg.h-1) and subject to wetting – drying cycles 45 days. Available K was extracted and determined for five successive treatments using wet and dry soils by NH4OAc , CaCl2 and NaOAc methods. Data obtained indicate a significant correlation between extractable amount of K and the levels of applied K to soils. The extractable amount of K for different treatment increased in the following sequence : NaOAc > NH4OAc > CaCl2
Keywords
K extraction methods; available K; release

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