FATE OF BISPYRIBAC SODIUM IN SOIL AND ITS EFFECT ON RICE QUALITY
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Date
2018-07-24
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CSKHPKV, Palampur
Abstract
In present investigation entitled “Fate of bispyribac sodium in soil and its effect on rice quality”, a field experiment consisting of four treatments viz. bispyribac sodium 10g/ha, 20g/ha, 40g/ha and control was laid out in randomized block design (RBD) in the Department of Agronomy, Forages and Grassland Management, CSK HPKV, Palampur during kharif 2017. For residue and biochemical studies, soil and rice plant samples were collected at different time intervals after herbicide application and rice grain samples at crop harvest. Bispyribac sodium at three application rates i.e. 10g/ha, 20g/ha and 40g/ha persisted in soil upto 10, 15 and 45 days after herbicide spray, respectively. The degradation data generated indicated that more than 75 per cent of applied bispyribac sodium dissipated within 7 days of herbicide application. The logarithmic plots of herbicide concentration of different doses vs time fitted first order kinetics decay curve. Terminal residues of bispyribac sodium in rice grain were below detectable level (≤0.025μg/g). A significant decrease over control in biochemical attributes of rice leaves i.e. ALS activity and total carotenoids was observed upto 10 and 30 days respectively after bispyribac sodium application and thereafter the ALS activity and total carotenoids values were not influenced conspicuously. Whereas, total chlorophyll and total sugar content in rice leaves increased significantly with maximum increase noticed in treatment bispyribac sodium 20g/ha. Quality parameters i.e. total protein, total sugars and starch content were not influenced very distinctively with applied bispyribac sodium treatments. The data on residues and biochemical studies of bispyribac sodium in rice suggest that use of bispyribac sodium at three rates of application in rice crop is safe both in terms of crop quality and food safety point view. It can also be inferred from the above findings that effect of bispyribac on ALS and total carotenoids was temporary and recovered with passage of time.
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