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Usefulness of organic manures and their nitrogen fertilizer equivalents

Published online by Cambridge University Press:  27 March 2009

R. C. Sharma  and
H. C. Sharma
R. C. Sharma
Affiliation:
Central Potato Research Institute, Shimla-171 001, India
H. C. Sharma
Affiliation:
Central Potato Research Institute, Shimla-171 001, India
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Extract

Organic manures, despite their low nutrient analysis, play a significant role in meeting fertilizer needs of crops. When manures are applied in conjunction with fertilizers, yields are generally higher than with equivalent fertilizers alone. An increase in the yield optima leads to uncertainties in working out fertilizer economy in quantitative terms. In order to overcome this, a concept of fixed yield is described in this paper.

Type
Short Notes
Information
The Journal of Agricultural Science , Volume 111 , Issue 1 , August 1988 , pp. 193 - 195
Copyright
Copyright © Cambridge University Press 1988

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References

Sharma, R. C. (1984). Investigation on soil nitrogen availability and nitrogen nutrition of potato. Annual Scientific Report, Central Potato Research Institute, Shimla, pp. 56–62.Google Scholar
Sutherland, R. A., Wright, C. C., Verstraeten, L. M. & Greenwood, D. J. (1986). The deficiency of the economic optimum application for evaluating models which predict crop yield response to nitrogen fertilizer. Fertilizer Research 10, 251–262.Google Scholar