Optimization of nitrogen fertilization for aerobic rice (Oryza sativa)
DOI:
https://doi.org/10.59797/ija.v65i2.5585Keywords:
Aerobic rice, B:C ratio, Grain yield, Growth parameters, Split doses, Yield attributesAbstract
Field experiments were conducted during the rainy (kharif) seasons of 2014 and 2015 at Aduthurai, Tamil Nadu, to assess the efficiency of N scheduling and dosage for aerobic rice (Oryza sativa L.) cultivation. The soil was clay loam. The experiments were laid out in a split-plot design with 3 replications. The main plot treatments consisted of 4 nitrogen(N) levels and the subplots 6 N split doses. Among the N levels, application of 200 kg N/ha registered higher growth parameters, N uptake and yield attributes. The growth attributes of aerobic rice increased with the increased N dose up to 200 kg N/ha and was comparable with 175 and 150 kg N/ha. The higher grain yield and benefit: cost (B: C) ratio were observed with the application of 175 kg N/ha. Among the split doses, N at 4 splits (1/4 at 10–12 days after emergence + 1/4 at active tillering stage + 1/4 at panicle-initiation stage + 1/4 at flowering) recorded higher growth parameters, yield attributes, grain yield, gross returns, net returns and eventually higher B: C ratio. Achieving higher yield with remunerative B: C ratio, a nitrogen dose of 175 kg N/ha in 4 splits 1/4 at 10–12 days after emergence + 1/4 at active tillering stage + 1/4 at panicle-initiation stage + 1/4 at flowering can be recommended for sustaining the aerobic rice yield.
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