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Optimum Seed Rate and Nitrogen Fertilizer Requirement of Rice Under Semi‐deepwater Ecosystem
Author(s) -
Sharma A. R.,
Ghosh A.
Publication year - 1998
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1998.tb00413.x
Subject(s) - panicle , seedling , agronomy , fertilizer , nitrogen , yield (engineering) , biology , seeding , grain yield , zoology , chemistry , materials science , organic chemistry , metallurgy
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.