EFFECTS OF MOCAP, N-SERVE, TELONE, AND VORLEX AT TWO TEMPERATURES ON POPULATIONS AND ACTIVITIES OF MICROORGANISMS IN SOIL

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Abstract
The effects of Mocap, N-Serve, Telone, and Vorlex on microbial activity in a sandy loam were determined at two temperatures. The pesticides did not suppress bacterial populations at 5 or 28 C. High levels of the fumigants, however, decreased fungal populations at 5 C after 2 wk. N-Serve and Telone stimulated ammonification of incorporated peptone, whereas an inhibitory effect occurred with Vorlex. Mocap and Telone at low levels stimulated nitrification of the native organic nitrogen after 2 wk at low temperature. All pesticides inhibited both nitrification of (NH4)2SO4and oxidation of elemental sulfur after 4 wk at 28 C. Oxygen consumption increased with increasing concentrations of Mocap. Treatment with fumigants and glucose depressed respiration in the early stages of incubation. The effects of the fumigants on respiration showed that soil temperature was negatively correlated with incubation time in the early stages of the experiments.

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