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Effect of basal and post-flood nitrogen fertilization on performance of rice (Oryza sativa) under conditions of intermediate deep-water and simulated flash-flooding

Indian Agricultural Research Journals

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Title Effect of basal and post-flood nitrogen fertilization on performance of rice (Oryza sativa) under conditions of intermediate deep-water and simulated flash-flooding
 
Creator Sharma, A R`
 
Subject —
 
Description An experiment was conducted during rainy seasoll of 1991 and 1992 at Cuttack to study the effect of basal and top-dressing of nitrogen (0,20 and 40 kg N/ha) on growth and yield of direct-sown 'Gayatri' rice (Oryza sativa L.) under conditions of intermediate deep-water (0-50 cm) and simulated flash-flooding (submergence at 75 days after germination for 10 days). Flash-flooding decreased the tillers/m2 (18.3%). dry-matter accumulation (47.4%) and grain yield (31.3%) compared with the natural submergence of intermediate water depth. However, the adverse effect was more pronounced on plants grown without N than with 40 kg N/ha at sowing. Basal application of 40 kg N/ha increased the grainyield (+ 1.01 tonnes/ha) significantly due to better initial crop vigour, leading to higher number and weight of panicles at maturity. The beneficial effect of N fertilization was due to higher tiller survivability and dry-matter production. Top-dressing 20 kg N/ha at 85 days after germination. (after termination of flash·flooding) increased the yield sigllificantly under submerged condition (+ 0.25-0.56 tonne/ha), particularly when basal N was not given, but did not prove effective under submergence-free condition. The result indicated that loss in yield due to flash·flooding could be compensated partially by N fertilization at sowing and after the submergence stress.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2012-06-05
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/18785
 
Source The Indian Journal of Agricultural Sciences; Vol 65, No 6 (1995)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/18785/9145
 
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