Abstract
The respiration of soil samples was studied using mixtures of glucose, acetate, lactate and citrate with either glutamic acid or alanine as substrates. The assimilative component was studied in remoistened air-dried samples and the oxidative component with fresh samples of various soils. The form of the respiration curves is described. The net amount of oxygen consumed by samples treated with the mixture usually equals the sum of net consumptions by the sample treated with isolated components of the mixture. In some cases it is greater. This exception is supposed to be the result of stimulating the oxidation of soil organic matter. This is not always the rule with initial respiration rate in experiments with fresh soil. The nature of the respiration of untreated soil samples is discussed.
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