Effects of herbicides and their concentration and application method on residual toxicity in soil. Studies on the residual toxicity of herbicides in soil (2)

Wang, C.C.; Tsai, R.D.; Huang, T.C.

Journal of the Agricultural Association of China 100: 103-116

1977


Accession: 000361293

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Abstract
Residual toxicity was investigated using leaching columns and 2 indicator plants (soybean and jute) in the glasshouse. Use was made of the residual toxicity index (RTI) derived from the combined indices of germination rate, survival rate, plant height, herbicidal injury and leaching. Jute was, on average, five times more sensitive to herbicides than soybean and was particularly sensitive to diuron, linuron, atrazine and molinate and soybean was particularly sensitive to atrazine, MCPA and trifluralin. The RTI showed that 41% of atrazine and 26-48% of the applied simazine remained in soil 3 months after application; the figures for diuron were 37%, linuron 38%, molinate 34%, trifluralin 30%, PCP 12%, TCA 10%, aminotriazole 6.5%, MCPA 16% and 2,4-D 2.1%. Herbicide concn. closely correlated with phytotoxicity and persistence.