Response of wetland rice to potassium in farmers' fields of the Barind tract of Bangladesh
1998
Saleque, M.A. | Saha, P.K. | Panaullah, G.M. | Bhuiyan, N.I.
Six trials were conducted in the dry and wet seasons on potassium (K)-deficient Barind soils (Aeric Haplaquept) to evaluate the response of rice to potassium (K) fertilizer. The application of 30 kg K ha-1 significantly increased rice grain yields at all the test locations. In some cases, grain yield increased consistently up to 120 kg ha-1 of applied K. Rice yield responded quadratically to K application. The calculated maximum K doses were 114 kg ha-1 for the dry season and 165 kg ha-1 for the wet season. The calculated optimum doses of K application were 100 kg ha-1 and 147 kg ha-1 for the dry season and wet season, respectively. Application of K fertilizer increased K content only in the straw, but not in the grain. The K use efficiency of wetland rice at 30 kg K level was 16.7 kg grain kg-1 applied K in the dry season and 10.0 to 33.3 kg grain kg-1 applied K in the wet season. The K uptake by rice was higher in the dry season than in the wet season. The average apparent K recovery at 30 kg K ha-1 application level was 59%, which decreased gradually with an increase in the K dose.
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