Effect of Monocrotophos and Quinalphos on Soil Population and Nitrogen-Fixing Activity of Azospirill

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The effects of monocrotophos and quinalphos on population and nitrogen-fixing activity ofAzospirillum sp.in four agricultural soils were determined in a laboratory study.Concentrationsof the two insecticides up to a 5 kg ha<sup>-1</sup>level w
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