Pisum sativum L. cv. Trapper plants were inoculated and grown in a controlled environment on N-free nutrient solution. After 4 weeks N was supplied to treatment plants as NH 4 NO 3 , KNO 3 , or NH 4 Cl and rates of C 2 H 2 reduction, root + nodule respiration, and leaf photosynthesis were determined 1 week later. The increase in respiration per unit of C 2 H 2 reduction was not affected by either the form of N added or the light conditions during growth, although the basal respiration rate with no C 2 H 2 reduction increased with irradiance level. The mean regression coefficient from plots of respiration versus C 2 H 2 reduction was 0.23 + 0.04 ( P (unk) .01) mg of CO 2 (μmol of C 2 H 2 reduced) −1 which was very similar to the value for the coefficient of respiration associated with nitrogenase activity estimated by subtracting growth and maintenance respiration. Since the rate of N accumulation in N-free nutrient conditions was proportional to the rate of C 2 H 2 reduction, it appears that the method gives a true estimate of the energy requirements for N fixation which for these conditions was equivalent to 17 grams of carbohydrate consumed per gram of N fixed.
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