Response of boro rice to potassium application in two soils of Bangladesh
1990
Razzaque, A.H.M. | Ali, M.I. | Habibullah, A.K.M. (Bangladesh Inst. of Nuclear Agriculture, Mymensingh (Bangladesh))
Glasshouse and field experiments were conducted during 1984- 85 and 1985-86 to find out the deficiency of potassium in Ghatail and Lokdeo series soils in order to determine the optimum requirement of potassium for HYV boro rice, IRATOM-24. In glasshouse experiments, sorghum and rice were used as test crops. Both Ghatail and Lokdeo series soils were found deficient in potassium. Between sorghum and rice, sorghum was a better indicator for potassium deficiency. Results of field experiments indicated a significant influence of potassium on IRATOM-24 in both soil series. In Ghatail soil, the yield of grain was increased with the application of potassium of the rate of 50 kg K2O/ha and subsequent increase of potassium reduced the yield. The highest straw yield was recorded with 100 kg K2O/ha. In Lokdeo soil, the grain yield increased from 3 to 4.7 t/ha with 50 kg K2O/ha indicating significant response of rice to K fertilizer. Although identical with 50, 100 and 150 kg K2O/ha, the highest straw yield was recorded with 200 kg K2O/ha.
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