NITROGEN METABOLISM IN THE SOY BEAN

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Abstract
Glycine max var. Peking was grown in soil and sand culture in the greenhouse; certain series in late winter but others during spring and summer. Some of the plants received abundant NO3, others limited NO3 and others no external supply of N. No record is given of growth. Nodules were absent. Plants were harvested for analysis each week for ten weeks. Fresh tissue was used for aqueous extraction of N fractions, including insol., sol., a amino, amide, other, NH3, NO2 and NO3. Determinations were made by recognized methods. The plants were separated into leaves (including petioles), whole stems and roots. Seeds and pods were discarded. The data are variable in trend perhaps because of variable seasonal light conditions. In general, % N content corresponded to the available NO3 supply. As the plants matured there was typically a gradual decrease in % of all determined forms of N and increase in % dry matter. When the plants were completely mature, degradation effects appeared. Leaves were notably high in insol. N. The author suggests his data indicate reduction of NO3 to NO2 to NH3; also formation of NH3 proteolytically. With decrease in available NO3, there was proportionately greater decrease in amide than in a amino N.

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