Effect of nitrogen fertilizer management and plant population density on nitrogen fertilizer use efficiency in irrigated (Boro) rice
1990
Bhuiyan, N.I. | Shah, A.L.
A field experiment was conducted at the BRRI farm, Joydebpur (Grey Terrace soil) during the Boro seasons of 1981 and 1983 using BR3 as the test crop to study the effect of N fertilizer application schedule and plant population density on crop performance, N use efficiency, N uptake and apparent N recovery of the added N fertilizer under irrigated rice culture. Three N fertilizer application schedules were tested with two plant population densities, 25 hills/m(2) and 50 hills/m(2). Plant population density did not influence grain and straw yields although the panicle number per unit area was significantly increased due to an increase in population density. The application of N fertilizer at the rate of 60 kg/ha, irrespective of the application schedule produced more panicles per unit area than when no N was applied, and significantly increased grain and straw yields over control. The three-split application of N fertilizer excluding a basal dose was more effective than the two-split, basal inclusive method or the all-basal application method in terms of the yield of wetland rice, and N fertilizer efficiency. It was concluded that it may not be necessary to increase plant population density to achieve the desired yield level provided a proper N fertilizer application schedule is maintained, specially on soils having moderate to high level of total N.
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