EFFECT OF PHOSPHATE AND CHLORIDE SALTS ON MICROBIAL ACTIVITY IN FLOODED SOIL

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Abstract
Samples (5 g) of Pembroke soil were incubated at 40°C in 12.5 ml of salt solution (0, 1 × 10−3, 1 × 10−2, 2.5 × 10−2, and 1 × 10−1M of KH2PO4, NaH2PO4, KCl, and NaCl) for varying time periods up to 35 days in order to determine salt effects on biological and chemical changes in flooded soil.For all salts, carbon dioxide evolution increased with time of incubation and generally decreased with concentration of salt at the 7-day incubation. However, at longer incubations P salts stimulated CO2 evolution while Cl salts had little effect. Although theoretically possible, NH4 precipitated with P as ammonium taranakites in these soil systems was rejected since added NH4 was recovered from sterile soil systems. The data suggest that P salts increase microbial activity resulting in greater amounts of N being immobilized in microbial tissue. Samples (5 g) of Pembroke soil were incubated at 40°C in 12.5 ml of salt solution (0, 1 × 10−3, 1 × 10−2, 2.5 × 10−2, and 1 × 10−1M of KH2PO4, NaH2PO4, KCl, and NaCl) for varying time periods up to 35 days in order to determine salt effects on biological and chemical changes in flooded soil. For all salts, carbon dioxide evolution increased with time of incubation and generally decreased with concentration of salt at the 7-day incubation. However, at longer incubations P salts stimulated CO2 evolution while Cl salts had little effect. Although theoretically possible, NH4 precipitated with P as ammonium taranakites in these soil systems was rejected since added NH4 was recovered from sterile soil systems. The data suggest that P salts increase microbial activity resulting in greater amounts of N being immobilized in microbial tissue. © Williams & Wilkins 1974. All Rights Reserved.

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