Study of soil algae. 7. Adsorption of herbicides in soil and prediction of their rate of application by algal methods

Pillay, A.R.; Tchan, Y.T.

Plant and Soil 36(3): 571-594


ISSN/ISBN: 0032-079X
Accession: 000209977

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Algal techniques were used to study the soil factors affecting the toxicity of herbicides. It was found that o.m. adsorbed 18 times more herbicide than clay. The inherent phytotoxicity of different herbicides was tested by these methods; the results compared favourably with those obtained with higher plants. The order of toxicity as determined with algae was diuron > neburon > monuron > atrazine > simazine > atraton. The prediction of application rates of diuron and simazine by algal methods was tested in the field with wheat; the predictions were correct and better than the commercial recommendation. Good weed control was obtained at the early stage of crop growth. At later stages toxicity was insignificant and crop plants competed successfully with emerging weeds. From summary.