Distribution of different forms of potassium was studied in somesoils from different agro-climatic regions of Bangladesh which are under intensive cultivation. All the forms of K in the study were directly related with one another. The highest exchangeable K was found in calcareous alluvium (Saline) soil. In twelve selected soils with three levels of K (0, 100 and 300 mg kg−1) were studied in a pot experiment with rice (var. BR 11) as a test crop to findout a suitable K determination method by correlating the soil K values with the dry matter yield and K uptake. The data show that NH4OAc and boiling HNO3 extractable K had the highest correlation coefficients with the dry matter yield (r = 0.802 and 0.729) and the K uptake (r = 0.859 and 0.870) by the rice plants.
Soil potassium, different methods, pot experiment, soils of Bangladesh
