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Rangaswamy V, Charyulu PB, Venkateswarlu K: Effect of monocrotophos and quinalphos on soil population and nitrogen-fixing activity of Azospirillum sp. Biomed Environ Sci. 1989 Dec;2(4):305-11.
The effects of monocrotophos and quinalphos on population and nitrogen-fixing activity of Azospirillum sp. in four agricultural soils were determined in a laboratory study. Concentrations of the two insecticides up to a 5 kg ha-1 level were either stimulatory or innocuous to the population of Azospirillum in the soils. Four successive applications of the insecticides to soils resulted in a significant increase in the population density. Cultures of Azospirillum sp., isolated from insecticide-treated soils, exhibited greater nitrogen-fixing activity. Three consecutive subculturings of the isolates from insecticide-treated soils had no effect on their nitrogen-fixing activity. |
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