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Changes in Yields and Fertilizer Responses with Continuous Cropping in Uganda

Published online by Cambridge University Press:  03 October 2008

D. Stephens
Affiliation:
Department of Agricultural Chemistry, Makerere University College, Kampala, Uganda

Summary

In sixteen factorial field trials with N, P, K, Mg, trace element and farmyard manure treatments, yields declined during the first four years of cropping following a resting period under grass, responses to K and farmyard manure increased, and other treatments showed no significant changes. After a few years of continuous cropping potassium deficiency may seriously limit yields, especially of sweet potatoes. N, P and K fertilizers maintained yields as well as the farmyard manure treatment.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1969

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References

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