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Experiments measuring the residual effects of nitrogen fertilizers

Published online by Cambridge University Press:  27 March 2009

F. V. Widdowson  and
A. Penny
F. V. Widdowson
Affiliation:
Roihamsted Experimental Station
A. Penny
Affiliation:
Roihamsted Experimental Station
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Extract

The experiment testing N residues (made on a clay-loam soil) clearly showed that N applied for potatoes benefited the following wheat crop, but that N applied for wheat benefited the following potato crop little. There were no worth-while 1. An experiment on a clay-loam soil measured responses to three amounts of nitrogen on alternate crops of wheat and potatoes; these dressings were tested in all combinations with three rates of N applied 1 and 2 years previously. Nitrogen applied for potatoes consistently increased yields of following wheat. The residue from applying 1·5 cwt. N/acre for potatoes was equivalent to topdressing the wheat with 0·55 cwt. N/acre; the value of the residue was decreased by applying N to the wheat. Potato yields were increased little by applying N to the preceding wheat crop and the residues were of little significance when compared with the responses to new N. There was no gain from N applied 2 years previously for either crop.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 65 , Issue 2 , October 1965 , pp. 195 - 200
Copyright
Copyright © Cambridge University Press 1965

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References

Francis, A. L. (1964). Experimental Husbandry Farms and Experimental Horticulture Stations, Progress Report 1964, p. 32.Google Scholar
Van Der Paauw, F. (1963). Plant and Soil, 19, 324.CrossRefGoogle Scholar
Watson, D. J. & Patterson, H. D. (1960). Rep. Rothamst. Exp. Sta.for 1959, p. 164.Google Scholar