Abstract
Alternative N fertiliser management strategies are needed to increase N-use efficiency in wetland rice (Oryza sativa L.). In the wet season of 1993–1994, field experiments were conducted to evaluate the band placement of urea solution in comparison with broadcast prilled urea, neem-coated urea, or point-placement of urea supergranules. Both grain yield and N-use efficiency were higher with band placement of urea solution (50 or 100 kg N ha-1) compared to a conventional split application of prilled urea at 100 kg N ha-1. The total 15N recovery was 58.7 and 51.7% with band placement of urea solution at 50 and 100 kg N ha-1, respectively, compared with 47.8% for neem-coated urea and 28.5% for a conventional split application of prilled urea.
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