EFFECT OF FLUCTUATING TEMPERATURES ON SOIL NITROGEN MINERALIZATION

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Abstract
Different sequences of temperature fluctuations between 5° and 35°C imposed upon three soils during incubations of 52 days had no effect upon the amount of N mineralized. Over the first 32 days, the results agreed with calculated mineralization rates in all three soils, but only one soil (Barnes) showed agreement for the whole 52-day period. The failure to obtain agreement in Cecil and Kranzburg soils beyond 32 days may be due to the effects of extreme temperature changes upon the ammonifying organisms. The results, however, justify continued efforts to improve means for predicting soil nitrogen mineralization rates in the field. Different sequences of temperature fluctuations between 5° and 35°C imposed upon three soils during incubations of 52 days had no effect upon the amount of N mineralized. Over the first 32 days, the results agreed with calculated mineralization rates in all three soils, but only one soil (Barnes) showed agreement for the whole 52-day period. The failure to obtain agreement in Cecil and Kranzburg soils beyond 32 days may be due to the effects of extreme temperature changes upon the ammonifying organisms. The results, however, justify continued efforts to improve means for predicting soil nitrogen mineralization rates in the field. © Williams & Wilkins 1975. All Rights Reserved.

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