Abstract
Plants of whte lupin (Lupinus albus L. cv. Multolupa) and soyabean (Glycine max L. cv. Clarke) were grown in controlled-environment cabinets, subjected to various stresses and their nodular nitrogenase activity and total root respiration measured. When these measurements were used to calculate nodular oxygen diffusion resistance, using a simplified equation for Fick's first law of diffusion, it was found that the apparent resistance of stressed nodules increased anomalously with decreases in external oxygen concentration. A new analysis procedure is proposed to alleviate this anomaly
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