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Effects of Rate and Time of Nitrogen Application on Yields of Cotton in Northern Nigeria

Published online by Cambridge University Press:  03 October 2008

J. B. Smithson  and
R. G. Heathcote
J. B. Smithson
Affiliation:
Institute for Agricultural Research, Ahmadu Bello University, Samaru, Zaria, Nigeria
R. G. Heathcote
Affiliation:
Institute for Agricultural Research, Ahmadu Bello University, Samaru, Zaria, Nigeria
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Summary

Trials to determine the optimal rate and time of nitrogen application to cotton were conducted at three sites for three seasons. The results indicate that nitrogen is used most efficiently when applied at relatively low rates, with at least half the application delayed until flowering. Early application leads to the incorporation of a greater proportion of the nitrogen into the vegetative structures which, at lower rates, may leave insufficient for fruit development. With late application a greater proportion of the nitrogen is utilized in reproductive growth, although full utilization may not be achieved at higher rates.

Type
Research Article
Information
Experimental Agriculture , Volume 13 , Issue 1 , January 1977 , pp. 1 - 8
Copyright
Copyright © Cambridge University Press 1977

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