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The effect of the intensities of potassium and sodium in soil on the growth of sugar beet

Published online by Cambridge University Press:  27 March 2009

D. L. Rowell  and
Kamil Erel
D. L. Rowell
Affiliation:
Soil Science Department, The University, Reading, Berks
Kamil Erel
Affiliation:
Soil Science Department, The University, Reading, Berks
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Summary

In a pot experiment, the growth of sugar beet on one soil with three levels of exchangeable Na ceased when the intensity of K measured as the activity ratio aK/√[a(Ca + Mg)] in the equilibrium soil solution had fallen to 6 × 10–4 (mole per litre)½;, the intensity of Na, aNa/√[a(CaH-Mg)], to between 1·7 and 4 × 10–3 (mole per litre)½;and exchangeable Mg to 0·14 m-equiv per 100 g soil. It was concluded that both the Na and the K intensities were exhaustion values but that K supply was preventing further growth. The additions of Na did not affect either yield or the uptake of K, Mg and Ca, but more Na was taken up from soils with higher Na levels.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 76 , Issue 2 , April 1971 , pp. 223 - 231
Copyright
Copyright © Cambridge University Press 1971

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