Irrigation and nitrogen application schedules for hybrid 'ADTRH I' rice (Oryza sativa) in Tamil Nadu
DOI:
https://doi.org/10.59797/ija.v49i1.5151Keywords:
Irrigation, Split application of N, Rice hybridAbstract
A field experiment was conducted at Coimbatore during the rainy (kharif) season of 1999 and 2000, to study the effect of different water- and nitrogen-management practices on hybrid 'ADTRH I' rice (Oryza sativa L.) in clay-loam soil. The maximum yield of grain and straw were recorded with irrigation on the day of disappearance of ponded water which remained on a par with that obtained with irrigation 1 day after disappearance of ponded water. Among the nitrogen-management practices, significantly highest grain and straw yields were observed with recommended dose of 150 kg Ntha applied in 4 splits along with green manure. Similar trend was recorded for number of panicles, spikelets and filled grains while spikelet sterility and single grain weight remained unaf- fected by irrigation treatments, but showed a marked reduction of 2.0 to 2.5% at N,rN,>N, levels over No. Thus application of N in 3 or 4 splits helped reduce spikelet sterility and also improved grain weight significantly. The N uptake was significantly enhanced by the irrigation regimes with irrigation on the day of disappearance, and 1 day after disappearance of ponded water, being equally effective. Application recommended dose of N in 4 splits + green manure and 4 splits in different ratios were found equally effective in terms of nitrogen uptake. Higher agronomic efficiency was recorded with irrigation on the day of disappearance along with 4 splits of N + green manure and SPAD (spall out) basis of nitrogen application. Maximum water-use efficiency was obtained with wider irrigation interval at 3 days after disappearance of ponded water along with the 4 applications of N + green manure.References
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