A Comparison of Sequential Extraction Methods for Used to Determine Exchangeable Cations (Ca,MgNa,K) of Erzurum Plain Agricultural Soils

Abstract

The purpose of this study was to studiedsuitablity of sequential extraction method for determining exchangeable cations (Ca,Mg,K and Na) in Erzurum plain agriculture soils. The purpose of also thiswas aimed investigation to exchangeable cation status of Erzurum plain soils was as well as to determine find out suitability of different extraction methods (NH40Ac extraction method and sequential extraction method) for the availability exchangeable cations (Ca,Mg,K,Na)in Erzurum region soils. Representative 19 of soils samples were collected from different soil locations of Erzurum. In order to select the most suitable chemical method as related to exchangeable cations content of the test plant (potato) was taken as the standart (biological) index. The results of this study showed that plant available Ca,Mg,K,Na obtained with sequentaly extraction step 2 exchangeable K and step.6 exchangeable Na residual chemical exraction methods were interrelated (p<0.05) with K and Na content of potato leaf (biological index) for Erzurum Plain soils.