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Nitrogen Nutrition of Cowpea (Vigna unguiculata)*

II. Effects of Short-term Applications of Inorganic Nitrogen on Growth and Yield of Nodulated and Non-nodulated Plants

Published online by Cambridge University Press:  03 October 2008

P. J. Dart ,
P. A. Huxley ,
A. R. J. Eaglesham ,
F. R. Minchin ,
R. J. Summerfield  and
J. M. Day
P. J. Dart
Affiliation:
University of Reading, Department of Agriculture and Horticulture, Plant Environment Laboratory, Shinfield, Reading RG2 9AD, UK
P. A. Huxley
Affiliation:
University of Reading, Department of Agriculture and Horticulture, Plant Environment Laboratory, Shinfield, Reading RG2 9AD, UK
A. R. J. Eaglesham
Affiliation:
University of Reading, Department of Agriculture and Horticulture, Plant Environment Laboratory, Shinfield, Reading RG2 9AD, UK
F. R. Minchin
Affiliation:
University of Reading, Department of Agriculture and Horticulture, Plant Environment Laboratory, Shinfield, Reading RG2 9AD, UK
R. J. Summerfield
Affiliation:
University of Reading, Department of Agriculture and Horticulture, Plant Environment Laboratory, Shinfield, Reading RG2 9AD, UK
J. M. Day
Affiliation:
University of Reading, Department of Agriculture and Horticulture, Plant Environment Laboratory, Shinfield, Reading RG2 9AD, UK
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Summary

Average seed yields of effectively nodulated cowpea plants were 38% greater than those of non-nodulated plants when both received applied nitrogen at concentrations ranging from 60 to 240 ppm during one of three periods: emergence to first flower, first flower to mid pod-fill, or mid pod-fill to maturity. Nodulation increased seed yields by 45% when plants received a ‘basal’ level of 30 ppm N throughout growth. None of the combined nitrogen treatments could compensate non-nodulated plants for the loss of symbiotic nitrogen fixation. Non-nodulated plants relying on applied N branched less, produced fewer peduncles and set fewer pods on each peduncle than nodulated plants.

Type
Research Article
Information
Experimental Agriculture , Volume 13 , Issue 3 , July 1977 , pp. 241 - 252
Copyright
Copyright © Cambridge University Press 1977

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References

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