Potassium Fractions and Rice Yield in Different Agro-ecological Zones of Bangladesh

Response of Potassium (K) is boosted due to the introduction high-yielding varieties and cropping intensity. So, a pot experiment was done see allocation native added K in soils response this on rice. Seven soil samples from seven AEZs. An amount 1-kilogram taken each 28 earthen pots which 14 for cultivation rice without as control. other fertilizers applied follows Fertilizer Recommendation Guide-1012. Two replicate plots were used per treatment. Then saturated with water so that could be soaked well. The kept condition one day allow settle properly. variety BRRI dhan28. All forms found remarkable decrease cultivation. depleted non-exchangeable sum largest, followed by exchangeable then, control plots, water-soluble K. almost similar but higher than treated pots. A significant variation among yields ranging 3.77 5.48 g pot-1. average dry matter yield 4.75 pot-1 significantly non-treated 3.10