Abstract
1. Rice was grown for 5 months in a sand solution culture at two different
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(1)
K levels. The higher K supply resulted in a reduced uptake of Na +, Mg ++, and Ca++ by shoots. The uptake of NH4+-N of the shoots, however, was increased by the higher K supply.
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(2)
In short term experiments, ill which the NH4+-N of the uptake solution was labelled by N 15, increasing K concentrations in the uptake solution did not depress the NH4 + uptake of young rice plants. Higher K concentrations in the uptake solution favoured the translocation of labelled N from the roots to the shoots. In some cases the higher K levels resulted also in an enhanced transfer rate of labelled N from the soluble to the insoluble N fraction.
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(3)
Increasing levels of Mg++ in the uptake solution did not affect the uptake of labelled NH4-N.
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(4)
I t is concluded that K + and NH4 + do not compete for common binding sites of the uptake mechanism in rice roots. This lacking competition suggests the speculation that NH4+-N is absorbed mainly in form of NH8 by plant cells.
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Mengel, K., Viro, M. & Hehl, G. Effect of potassium on uptake and incorporation of ammonium-nitrogen of rice plants. Plant Soil 44, 547–558 (1976). https://doi.org/10.1007/BF00011374
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DOI: https://doi.org/10.1007/BF00011374