Assessment of extractants for soil available potassium determination in the selected soils of Kwara state, Nigeria

Response of potassium (K) correlated with extracted K using five laboratory methods: neutral N NH4OAc pH 7.0; 4.8, 0.01M CaCl2, 1N Hot HNO3 and 0.5N NaHCO3 7.0 by sorghum were determined in four selected soils from twenty locations Kwara State, Nigeria the green house to ascertain ideal procedure for routine analysis. Regression equations derived each soil between uptake level applied and, extrapolation, A-value, which represented amount available as K, was determined. The data methods zero-level uptake, one another. results showed that CaCl2 only, more than greater other methods. all were, however, significantly (p<0.05) A-value while had a highly significant correlation (0.99) low values normal relatively high positively 7.0, but negatively (-0.60) HNO3. However, 4.8 higher another (0.93) although they both unequal amounts K. Thus, could be conveniently handled work place hot 1 evaluation availability indices region.