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Effects of Combined Nitrogen on Nodulation and Growth of Phaseolus vulgaris

Published online by Cambridge University Press:  03 October 2008

K. O. Awonaike ,
P. J. Lea ,
J. M. Day ,
R. J. Roughley  and
B. J. Miflin
K. O. Awonaike
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, England
P. J. Lea
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, England
J. M. Day
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, England
R. J. Roughley
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, England
B. J. Miflin
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, England
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Summary

The effect of Rhizobium strain and low levels of nitrogen on growth and nitrogen fixation was studied on 5 seedlines of Phaseolus vulgaris. All plants responded to irrigation when low levels of nitrogen were supplied throughout each experiment during vegetative growth, but the final seed yield was not significantly affected. All strains induced less nodule tissue and lower nitrogenase activity per plant when nitrogen was applied; some strains were less sensitive than others. The proportion of the plant's nitrogen estimated to be derived from fixation (based on acetylene reduction) and fertilizer was affected by host genetics. Nodulated plants had nitrogenase activities comparable with other grain legumes and responded to combined nitrogen during vegetative growth, but this was not reflected in grain yield.

Type
Research Article
Information
Experimental Agriculture , Volume 16 , Issue 3 , July 1980 , pp. 303 - 311
Copyright
Copyright © Cambridge University Press 1980

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References

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