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0.5 M magnesium
"
nitrate> modified sulfuric acid> nitric acid. However, if the cost and speed of analysis is considered, the modified 1 N ammonium acetate method is preferable, especially where a large number of soil samples have to be analysed in a short period of time. The critical levels of 142 and 135 mgK kg-1 of soil were obtained for the ammonium acetate method by the statistical and the graphical methods of Cate and Nelson, respectively. The same values for
the modified ammonium acetate and the magnesium nitrate extactants were 127 and 122 mgK kg-1 , respectively, when the graphical method of Cate and
Nelson was employed. In this study, it was indicated that when Hunter and Pratt method of cold sulfuric acid was modified for the effect of soil
carbonates, a significant improvment in the correlations between the extractable K and the plant responses was obtained.]]>
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