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Effect of potassium fertilizer on cation uptake and concentration in oat shoots

Published online by Cambridge University Press:  27 March 2009

S. M. Ragab
S. M. Ragab
Affiliation:
Soils Department, Faculty of Agriculture, Al Azhar University, Cairo, Egypt
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Summary

Pot experiments were carried out using a system in which root mats were in contact with a Danish soil for 24, 72 or 168 h. Different rates of K fertilizer (0–80 mg K/100 g soil) resulted in marked responses at 168 h of roots–soil contact, however moderately or little responses at 72 or 24 h had occurred. Marked reciprocal K–Ca, K–Mg, K–Na relationships with yield response to rates of applied K were attributed to both dilution and antagonism. The latter was not apparently brought about by competition for the carrier binding site but from the unspecific replacement competition which occurred in the interior of plant cells and not in the outer surface of the cell root membrane.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 92 , Issue 3 , June 1979 , pp. 537 - 544
Copyright
Copyright © Cambridge University Press 1979

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