Oxygen Influence on Foliar Nitrogen Loss From Soyabean and Sorghum Plants*

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Abstract
An understanding of volatilization of nitrogen (N) from leaves of crop and weed species may be important to the improvement of crop production. Foliar N loss (both reduced and oxidized forms), net CO2 uptake, and transpiration rates were measured concomitantly at 30°C on soyabean (Glycine max (L.) Merr.) and sorghum (Sorghum bicolor (L.) Moench) leaves at low (1 per cent), ambient (20 per cent), and high (40 per cent) levels of oxygen. In soyabeans, maximum reduced and total N losses were found at the highest O2 concentration, and the lowest N losses were measured at the lowest O2 level. Net CO2 assimilation was significantly reduced with increasing O2 during two of three samplings. Quantities of oxidized N lost were not altered. Sorghum showed no significant effects from O2 on N loss or net CO2 assimilation. The increased ammonia released from soyabean foliage in the presence of higher concentration of O2 probably affects metabolic pathways that contribute to the total reduced N volatilization.

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