Factors limiting microbial activities in soil |
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Authors: | G. Stotzky A. G. Norman |
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Affiliation: | (1) Plant Nutrition Laboratory, The University of Michigan, Ann Arbor, Michigan, USA;(2) Central Research Laboratories, United Fruit Company, Norwood, Mass., (USA) |
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Abstract: | Summary The only nutrient element other than nitrogen and phosphorus which limited microbial activity in a sandy soil was sulfur. The addition of extremely small quantities of MgSO4, ranging from 0.32 to 1.6 mg sulfur/100 g soil, markedly increased the rate of oxidation of glucose. The optimum concentration of sulfur was correlated with the levels of glucose added, and a C/S ratio of 900 or less was required for maximum respiration. A number of compounds containing sulfur at different oxidation stages and in various structural configurations readily satisfied the sulfur requirement, indicating that the response was to sulfur as a nutrient and not to sulfate as an electron acceptor. Thiourea and elemental sulfur were utilized only slightly. The differential utilization of the various sulfur-containing compounds and the implications of sulfur as a limiting factor of microbial activities in soil were discussed.Paper No. 33. |
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