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Effects of farmyard manure and green manures on crop yields and nitrogen needs of potato-based cropping systems in Punjab

Published online by Cambridge University Press:  27 March 2009

R. C. Sharma ,
P. M. Govindakrishnan ,
R. P. Singh  and
H. C. Sharma
R. C. Sharma
Affiliation:
Central Potato Research Institute, Shimla 171 001, India
P. M. Govindakrishnan
Affiliation:
Central Potato Research Institute, Shimla 171 001, India
R. P. Singh
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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Summary

The results of a long-term field experiment conducted from 1977 to 1984 on alluvial (Ustochrept) soil of Jalandhar showed positive responses of the crops to N. The responses of potatoes to N were reduced by farmyard manure (FYM), green manure of dhaincha and moong and the responses to the organic manures were also reduced by N. The N responsesof potatoes were, however, not affected by the N applied to preceding maize. FYM was better than the green manures in augmenting total tuber yield, large-grade tuber yield and K concentration in the plants.

The N applied to the potatoes showed significant residual effect on succeeding wheat crops, reducing its optimum dose of N by about 50%. The residual effect of N on wheat was highly correlated with nitrate status of the soil. The organic manures applied to potatoes improved the yield of the succeeding wheat but did not differ from each other.

The fodder crop of pearl millet raised after 7 years also indicated the superiority of FYM to the green manures. There was a build-up of organic carbon, N, P and K in soil and the build-up was maximal with the use of FYM. The application of N had no effect on the organic carbon and nitrogen status of the soil. N improved the availability of P but decreased that of K.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 110 , Issue 3 , June 1988 , pp. 499 - 504
Copyright
Copyright © Cambridge University Press 1988

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