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Integrated management of Sesbania, Azolla and urea nitrogen in lowland rice under a rice–wheat cropping system

Published online by Cambridge University Press:  27 March 2009

B. S. Mahapatra  and
G. L. Sharma
B. S. Mahapatra
Affiliation:
G. B. Pant University of Agriculture and Technology, Pantnagar, Nainital-263 145, UP, India
G. L. Sharma
Affiliation:
G. B. Pant University of Agriculture and Technology, Pantnagar, Nainital-263 145, UP, India
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Summary

A two-year field experiment on a mollisol at Pantnagar showed that organic sources of N gave generally higher rice yields than the equivalent split dressing of prilled urea (PU). In 1985/86, Sesbania green manuring (40 kg N/ha) and PU (40 kg N/ha) and, in 1986/87, Sesbania (40 kg N/ha) + Azolla (40 kg N/ha) gave significantly higher yields than a split application of 80 kg N/ha as PU. Yield increases were attributed to significant variations in panicles/m2, filled spikelets/panicle and nitrogen uptake by the crop. These components, and grain yield, were significantly correlated with wet soil NH+4-N, which was increased by organic manuring. Wheat grown after each rice crop showed significant residual effects of the different sources of N applied to rice.

Type
Review
Information
The Journal of Agricultural Science , Volume 113 , Issue 2 , October 1989 , pp. 203 - 206
Copyright
Copyright © Cambridge University Press 1989

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References

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