Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya Mohanpur, Nadia, West Bengal, India
Online published on 3 November, 2011.
The dissipation pattern of the chlorophenoxy herbicides (2,4-D and 2,4/5-,T) residues in rice plant (Oryza sativa L.) has been studied along with their effect on the changes of plant pigments (chlorophyll a and b, total chlorophyll, carotene and anthocyanin), sugar and starch in different parts of the plant at different doses. The residues of 2,4-D and 2,4,5-,T remained at higher concentrations for larger period of time at higher doses. The concentrations of chlorophyll and carotene were found to be reduced with the application of both 2,4-D and 2,4,5-T. The concentrations of carotene and anthocyanin were recovered at lower doses but not at higher doses. In case of carbohydrate, the. sugar concentrations in all the plant parts initially decreased followed by an increase on 10th day after treatment with application of both the herbicides. In most of the cases, starch concentration gradually increased in the leaves and stems.
