Studies on residual persistence of herbicides in red soil

Singh, D.J.C.; Rao, I.V.S.

Indian Journal of Weed Science 3(2): 112-119


Accession: 000205511

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The residual effects of 2,4-D sodium (80%), simazine and dalapon sodium (80%) at 2.5, 5 and 10 ppm were investigated in pot tests using maize, sorghum, rice and groundnuts as indicator plants. In each pot 3 successive crops of the same species were allowed to grow for 30 days each and observations were made on toxicity. 2,4-D was completely non-toxic to rice but slightly more so to maize and sorghum especially during the first two growing periods. Simazine was non-toxic to maize and highly toxic to rice and groundnuts in the first two runs. Dalapon was non-toxic to groundnuts and toxic to maize, sorghum and rice for the first two runs. In general it was found that toxicity to indicator plants was completely eliminated by the third run, when growth better than that of the control treatment was sometimes observed. Toxicity was always directly related to concn. From summary.