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Studies on calcium cyanamide1 V. The Utilisation of Calcium Cyanamide in Pot Culture Experiments

Published online by Cambridge University Press:  27 March 2009

H. L. Richardson  and
E. M. Crowther
H. L. Richardson
Affiliation:
(Chemistry Department, Rothamsted Experimental Station, Harpenden, Herts.)
E. M. Crowther
Affiliation:
(Chemistry Department, Rothamsted Experimental Station, Harpenden, Herts.)
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Extract

1. In pot culture experiments with barley and mustard conducted in several soils over a number of years, the yield differences between calcium cyanamide and ammonium sulphate were generally small. Calcium cyanamide gave slightly poorer results than ammonium sulphate in soils with high responses to added nitrogen but definitely better ones in soils which contained much available nitrogen and in which calcium cyanamide greatly retarded nitrification.

2. The pot culture experiments confirmed the conclusion from earlier laboratory work that in normal soils calcium cyanamide was converted through urea into ammonia within a few days. Nitrate accumulation was less complete and slower from calcium cyanamide than from ammonium sulphate. In one soil the nitrogen from calcium cyanamide remained as ammonia for several weeks, the nitrate content being below that even of unmanured soil.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 25 , Issue 1 , January 1935 , pp. 132 - 150
Copyright
Copyright © Cambridge University Press 1935

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References

REFERENCES

(1)Crowther, E. M. and Richardson, H. L.J. agric. Sci. (1932), 22, 300.CrossRefGoogle Scholar
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(4)Dawson, R. B. Thesis for the Degree of M.Sc. (University of London), 1927.Google Scholar
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(6)Crowther, E. M.Rep. Progr. Appl. Chem. (1930), 15, 475; (1933), 18, 530.Google Scholar