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The influence of temperature and available nitrogen supply on the growth of pasture in the spring

Published online by Cambridge University Press:  27 March 2009

G. E. Blackman
G. E. Blackman
Affiliation:
Imperial Chemical Industries, Ltd., Jealott's Hill Research Station, Bracknell, Berks
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Extract

In recent years a number of workers have investigated the influence of nitrogenous fertilizers on the growth of pastures. In some cases they have claimed that such fertilizers lengthen the grazing season by producing grass earlier than normal in the spring, but no research has been carried out on the factors controlling this spring growth. Watson et al. (15) in a study of the influence of nitrogenous fertilizers on the seasons’ yield of rotationally grazed pasture at Jealott's Hill, showed that in 1 year ammonium sulphate applied at the rate of 23·2 lb. nitrogen per acre in March enabled the treated plots to be grazed some 14 days earlier than the control. Richardson(13) found that 44·8 lb. nitrogen per acre gave marked increases in yield. Woodman & Underwood(16), however, claimed that ammonium sulphate (14·5 lb. nitrogen per acre) produced no strikingly higher yields.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 26 , Issue 4 , October 1936 , pp. 620 - 635
Copyright
Copyright © Cambridge University Press 1936

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References

1 Papers summarizing some of the results of this investigation have been read at meetings of the Biochemical Society in June 1932, and the International Soil Science Congress at Oxford in July 1935.

page 626 note 1 For simplicity of reference the words “soil temperature” in the remainder of this paper signify soil temperature at 4 in. depth at 9 a.m. unless otherwise stated.