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An experiment measuring effects of N, P and K fertilizers on yield and N, P and K contents of grass

Published online by Cambridge University Press:  27 March 2009

F. V. Widdowson ,
A. Penny  and
R. J. B. Williams
F. V. Widdowson
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
A. Penny
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
R. J. B. Williams
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
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Extract

To obtain large yields of grass much N fertilizer is usually needed, and when such grass is cut and conserved large amounts of K soon are removed from the soil. Some soils contain so little ‘available’ K that yields are soon limited unless grass is given enough K fertilizer, but other soils supply more K and so need less K fertilizer. Soils differ so greatly in their ability to supply crops with K that it is difficult to generalize about the fertilizer K requirements of grass, especially as the use to which the grass is put greatly affects the soil K ‘balance sheet’. On average, grass in England grows well for not much more than 6 months each year. This implies that, when cattle are maintained on hay or silage for much of the remainder of the year, on average one-third of the grass product each year may have to be cut, removed from the field, and conserved. Much of the N, P and K contained in this grass is not returned to the soil.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 64 , Issue 1 , February 1965 , pp. 93 - 100
Copyright
Copyright © Cambridge University Press 1965

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References

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