Abstract
Long-term field experiments were conducted at Jorhat on rice–rice and rice–wheat cropping systems to study the impact of herbicides in crops, soils and also to assess the impact of herbicides on soil properties and crop yield. Butachlor and pretilachlor were applied as pre-emergence herbicides in transplanted rice at the rate of 1.5 and 0.75 kg/ha, respectively. In wheat, isoproturon at 0.75 kg/ha was applied as post-emergence. Application of butachlor and pretilachlor to rice and isoproturon to wheat did not cause any significant change in physico-chemical and biological properties of the soil. There was no effect of butachlor or pretilachlor on the succeeding crop’s germination or growth or yield. The establishment or growth of the rice seedlings was not affected by the isoproturon residues, and no phytotoxicity symptoms were observed in the rice crop. Butachlor and pretilachlor residues persisted in the soil up to 30 days after application, beyond which the herbicides were found below the detection limits (0.05 ppm). Concentration of these herbicides in grain and straw was also below the detection limit. Butachlor or pretilachlor residues from water bodies at different locations adjacent to the herbicide-applied fields were found below detection level (0.01 ppm).
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Mahanta, K., Bora, N., Deka, J., Barua, I.C. (2019). Herbicide Residues in Rice–Based Cropping Systems in Assam. In: Sondhia, S., Choudhury, P., Sharma, A. (eds) Herbicide Residue Research in India. Environmental Chemistry for a Sustainable World, vol 12. Springer, Singapore. https://doi.org/10.1007/978-981-13-1038-6_11
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