Effect of N source and application method on dry season irrigated rice [Bangladesh]
1988
Bhuiyan, N.I. | Shah, A.L. | Saleque, M.A. | Zaman, S.K. (Bangladesh Rice Research Inst., Joydebpur, Gazepur (Bangladesh))
Timing of urea application and method of urea supergranules (USG) placement on a clay loam soil with pH 6.5, 0.07% total N, 20 ppm available P, and 0.2 meq exchangeable K/100 g soil were studied. N was applied at 58 kg/ha. Urea was incorporated after application except at panicle initiation. USG was applied after seedling establishment at 10-12 cm soil depth. All treatments received 20-30-20 kg PKS/ha. Test variety was BR3. Application of N as prilled urea (PU) or as USG significantly improved panicle number/square meter and grain yield, over no N. Deep point placement of USG resulted in significantly higher grain yield than split application of PU. Further increase in grain yield, better N use efficiency (kg grain/kg N), and higher apparent N recovery occurred when the hole was closed after USG application.
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