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Cation-anion relationships in crop nutrition

Published online by Cambridge University Press:  27 March 2009

R. K. Cunningham  and
A. Karim
R. K. Cunningham
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
A. Karim
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
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Extract

Italian rye-grass was grown in the greenhouse in clay loam soil in winter 1962 with several rates of a nutrient solution containing NO3-N and P, K, Ca and Mg to see whether the grass had maximum values for sums of the cations and anions (σ cations, σ anions). Two other experiments were done in summer 1962 with a similar nutrient solution containing either NO3-N alone or NO3-N plus NH4-N.

At the same level of added nutrients summer yields of grass were about twice those in winter and there was little difference when nutrient mixtures with NO3-N+NH4-N or with NO3-N alone were used. The sum of the cations (m-equiv./lOO g. dry matter) in the grass was positively correlated

Type
Research Article
Information
The Journal of Agricultural Science , Volume 64 , Issue 2 , April 1965 , pp. 229 - 233
Copyright
Copyright © Cambridge University Press 1965

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