Abstract
Carbaryl application to soil collected from a rice fallow field was relatively less toxic to viable estimates of cyanobacteria and microalgae under nonflooded conditions than under flooded conditions. Application of 1-naphthol, the hydrolysis product of carbaryl, to soil under both the regimes increased the population of both cyanobacteria and microalgae. Soil application of carbaryl and 1-naphthol in combination, up to 1.0 kg ha(-1), was nontoxic to the viable population. The toxicity exerted by carbaryl and 1-naphthol towards growth, measured in terms of chlorophyll a, and nitrogenase activity was more pronounced in Anabaena spp. than in Nostoc spp.
MeSH terms
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Anabaena / drug effects
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Anabaena / growth & development
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Anabaena / metabolism
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Carbaryl / metabolism
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Carbaryl / toxicity*
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Chlorophyll / metabolism
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Chlorophyll A
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Culture Media / chemistry
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Cyanobacteria / classification
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Cyanobacteria / drug effects*
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Cyanobacteria / growth & development
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Cyanobacteria / metabolism
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Floods
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Hydrolysis
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Microalgae / drug effects*
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Microalgae / growth & development
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Microalgae / metabolism
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Naphthols / metabolism
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Naphthols / toxicity*
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Nitrogen Fixation / drug effects*
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Nitrogenase / metabolism
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Nostoc / drug effects
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Nostoc / growth & development
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Nostoc / metabolism
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Soil Microbiology*
Substances
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Culture Media
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Naphthols
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Chlorophyll
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1-naphthol
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Nitrogenase
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Carbaryl
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Chlorophyll A