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Effect of nitrogen fertilizer on yield and nitrogen concentration in grain and straw of rice under semi-deepwater conditions (51–100 cm)

Published online by Cambridge University Press:  27 March 2009

M. D. Reddy ,
M. M. Panda ,
B. C. Ghosh  and
B. B. Reddy
M. D. Reddy
Affiliation:
Agronomy Division, Central Rice Research Institute, Cuttack 753006, India
M. M. Panda
Affiliation:
Agronomy Division, Central Rice Research Institute, Cuttack 753006, India
B. C. Ghosh
Affiliation:
Agronomy Division, Central Rice Research Institute, Cuttack 753006, India
B. B. Reddy
Affiliation:
Agronomy Division, Central Rice Research Institute, Cuttack 753006, India
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Summary

Under conditions of semi-deep water (51–100 cm) rice varieties with greater plant height produced more dry matter and grain yield as N fertilizer was increased from 0 to 20 and 40 kg/ha. The varieties which performed better in a situation of slow rise in water level to a depth of 120 cm could not survive a quick rise in water level owing to their lesser plant height and elongation ability. The loss of dry matter (dead and dried leaves) was also greater in varieties susceptible to deep water than varieties tolerant of deep water.

With the increase in N fertilizer, there was increase in plant height, number of tillers, dry-matter production and grain yield. The loss of dry matter was less in crops given N fertilizer than in those not given N fertilizer. The varieties capable of producing higher grain yield in response to N fertilizer under semi-deep water did not improve their grain yield under intermediate deep water (15–50 cm). With increase in application of N fertilizer from 0 to 40 kg/ha the N concentration in grain increased. N concentration did not vary in straw under intermediate deep water, there was no definite trend in semi-deep water, and it was higher under conditions of semi-deep than intermediate deep water.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 110 , Issue 1 , February 1988 , pp. 53 - 59
Copyright
Copyright © Cambridge University Press 1988

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