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Residual effects of N, P and K applied to cotton on following crops of sorghum, dolichos and wheat in the Sudan Gezira

Published online by Cambridge University Press:  27 March 2009

H. O. Burhan  and
M. B. Said
H. O. Burhan
Affiliation:
Agricultural Research Corporation, Wad Medani, Sudan
M. B. Said
Affiliation:
Agricultural Research Corporation, Wad Medani, Sudan
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Summary

Residual effects of N, P and K applied to cotton on the following crops of dura (Sorghum vulgare), lubia (Dolichos lablab) and wheat (Triticum vulgare) were investigated using data obtained over a 30-year period from a factorial field experiment including various levels of the three nutrients. The three crops differed in their response to residual N, P and K. Dura and wheat, being nitrogen depleters highly responsive to fertilizer nitrogen, were consistently affected by residual N. The residual effects of N on grain and straw yields of both dura and wheat were significant in all seasons and the effects were proportional to the amount of N applied to the preceding cotton. There were indications, however, that a much greater part of the N applied in the preceding year was not available to the succeeding crop. Residual P did not have a significant effect on dura but it varied in its effect on the different components of wheat in different seasons. Residual K did not have any effect on dura or wheat. Data on nutrient uptake and composition of wheat tended to support the yield responses. Contrary to the response of the two cereal crops lubia, being a nitrogen fixing legume, did not respond to the effect of residual N and was consistently affected by residual P. Residual K had a slight effect on lubia in only a few seasons.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 84 , Issue 1 , February 1975 , pp. 81 - 86
Copyright
Copyright © Cambridge University Press 1975

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References

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