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Optimum sowing date and nitrogen fertilizer rate for rice varieties under intermediate deepwater conditions (15–50 cm)

Published online by Cambridge University Press:  27 March 2009

A. R. Sharma  and
M. D. Reddy
A. R. Sharma
Affiliation:
Division of Agronomy, Central Rice Research Institute, Cuttack 753006, India
M. D. Reddy
Affiliation:
Division of Agronomy, Central Rice Research Institute, Cuttack 753006, India
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Summary

In an intermediate deepwater situation (15–50 cm) at Cuttack, India, three improved high-yielding rice varieties, Utkalprabha (semi-tall), CR 292–8051 (intermediate tall) and Gayatri (semi-dwarf) were sown on 20 May, 30 May and 10 June in 1988 and 1989 with an application of either 0, 20 or 40 kg N/ha at sowing. Tall varieties performed better than the dwarf type but grain yield decreased with delay in sowing. The early-sown crops (20–30 May) germinated with pre-monsoon rains and were established well before water accumulated in the field from mid-June onwards. The late-sown crops (10 June), despite good initial germination, could not withstand immediate waterlogging. The tall variety, Utkalprabha, elongated faster with rising water level and escaped complete submergence; whereas the semi-dwarf Gayatri failed to withstand such extreme excess water stress. Application of N fertilizer up to 40 kg/ha proved beneficial to the crops sown by the end of May. However, with crops sown on 10 June, the application of N could not compensate for the loss in yield due to an inadequate initial crop stand. Therefore, early sowing of tall varieties by the end of May along with a basal application of N fertilizer is recommended for higher productivity of rice under excess water conditions.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 118 , Issue 2 , April 1992 , pp. 179 - 183
Copyright
Copyright © Cambridge University Press 1992

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References

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