Influence of Nitrogen and Potassium on Variations in Content of Malate, Citrate, and Malonate in Non‐Nodulating Soybeans (Glycine max)1

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Abstract
The influence of nitrogen and potassium on metabolism in non‐nodulating soybeans was studied. Nonprotein nitrogen was increased by high nitrogen rates but markedly reduced with increasing potassium levels. Malate decreased with increased potassium at low nitrogen fertility but increased at high nitrogen fertility. Citrate was reduced by additional potassium, irrespective of nitrogen level. Malonate was increased in nitrogen‐deficient plants when potassium was supplied. The sum of the three acids accounted for approximately 72% of the total acidity, irrespective of fertility treatments.It is suggested that, with plants growing under high nitrogen‐low potassium regimes, PEP is shunted into alternate pathways, thereby causing a shortage of acetyl CoA. The data suggest that OAA is preferentially produced from PEP in potassium‐deficient plants, since OAA derivatives accumulate.

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