The effect of DD nematocide on soil micro-organisms
The application of DD, a 1∶1 mixture of 1,3-dichloropropene and 1,2-dichloropropane, at field rate, to soil had neither stimulatory nor suppressive effects on bacteria, actinomycetes, fungi and cellulose decomposing bacteria. The toxic effect of the nematocide onAzotobacter and nitrogen-fixing clostridia was slight, the organisms recovering in a very short time. In fumigated soils the counts ofNitrosomonas andNitrobacter were markedly reduced and remained lower than the counts in the untreated soils for the 30 days duration of the experiment. The inhibitory effects of DD were to some extent influenced by soil type, being most marked in sandy and loam and least in calcareous soils.
KeywordsRice Straw Calcareous Soil Untreated Soil Soil Fumigant Straw Compost
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