Title: Optimum Seed Rate and Nitrogen Fertilizer Requirement of Rice Under Semi‐deepwater Ecosystem
Abstract: Abstract The effect of varying seed rates (100–1000 seeds m −2 ) and nitrogen fertilizer (0–60 kg N ha ‐1 ) applied either in a single basal dose or in splits was investigated on a tall elongating, photosensitive rice variety, Nalini, under semi‐deepwater conditions (0–100cm) during 1993 and 1994 at Cuttack, India. Seedling emergence was higher in 1993 (53.9 %) than in 1994 (44.1 %) and it increased proportionately with increasing seed rate, Increase in the number of tillers and panicles m −2 at higher seed rates was associated with a corresponding decrease in panicle weight. Regression analysis indicated a decrease of 0.91–1.28g in panicle weight for an increase of 100 panicles m −2 . The grain yield of rice was significantly higher at 400 seeds m −2 in 1993 and at 600 seeds m −2 in 1994 than at low seed rates but further increase in seed rate did not increase the yield. Application of N fertilizer increased the panicle number and thereby grain yield significantly. The effect of basal and split applied N at active or maximum tillering stages as well as between 30 and 60 kg N ha −1 was not significant on the grain yield. The results suggest that a basal dose of 30kg N ha −1 and seeding density of 400–600 seeds m −2 , resulting in 40–50 % seedling emergence and 150–200 panicles m −2 , each with 2.0–2.5 g weight, may be adequate for optimum productivity of rice under semideepwater conditions.
Publication Year: 1998
Publication Date: 1998-10-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 11
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