“Management of nitrogen in dry direct seeded rice for higher yield and nitrogen use efficiency”
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Date
2012
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Punjab Agricultural University, Ludhiana
Abstract
This investigation was carried out to find out the management of nitrogen in dry direct seeded rice (D-DSR) for higher yield and nitrogen use efficiency under field conditions. The experiment consisted of fifteen treatment combinations comprised of three N rates (120, 150, 180 kg N ha-1), four schedules of three rates of N application, two LCC treatments (LCC-3 and LCC-4) and zero - N control. The schedules of N application comprised of N application in three equal split doses applying first dose at basal or 14 DAS (0, 35, 63 and 14, 35, 63 DAS) and application of N in equal four split doses applying first dose at basal or 14 DAS (0, 28, 49, 70 and 14, 28, 49, 70 DAS). It is inferred that 120 kg N ha-1 when applied in three split doses was sufficient to produce optimum grain yield of dry direct seeded rice as further application of 150 or 180 kg N ha-1 did not increase the grain yield significantly. Among the different schedules of N application, three split doses were found to produce significantly higher grain yield than four split doses, at all the N levels. The higher grain yield in three split doses was accompanied by higher N uptake in grain, total N uptake, effective tillers and N translocation efficiency than N applied in four split doses. Harvest index, nitrogen harvest index and translocated N were found to be maximum at 120 kg N ha-1 when applied in three split doses applying first dose at 14 DAS. Agronomic efficiency, physiological efficiency and recovery efficiency were also highest at 120 kg N ha-1when applied in three split doses applying first dose at 14 DAS.