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Flood tolerance of rice grown under intermediate deepwater conditions (15–50 cm) as affected by phosphorus fertilization

Published online by Cambridge University Press:  27 March 2009

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

Summary

The effect of phosphorus fertilizer on the performance of an improved semi-dwarf (100 cm), long duration (170 days), photosensitive rice variety CR 1016, grown under conditions of intermediate deepwater (15–50 cm) and simulated flash flooding (80 cm), was investigated at Cuttack, India in 1985, 1987 and 1988. Growth and yield of rice subjected to overhead flash flooding (complete submergence) at the vegetative stage for 10 days was decreased significantly compared with partial submergence in water of intermediate depth. The adverse effect of complete submergence was due to greater tiller mortality and lower number and/or weight of panicles at maturity. Rice plants fertilized with P tolerated flooding better and produced significantly higher grain yields than when no P was applied. There was no significant effect of P application on the crop grown under natural unsubmerged conditions, except when it was raised in the same plots as the previous year and may therefore have benefited from residual effects. Therefore, application of 8.7–17.5 kg P/ha along with 60 kg N and 16.7 kg K/ha at sowing was essential to overcome the deleterious effects of submergence on rice grown under waterlogged conditions.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 1991

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References

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