Herbicide physiology in Chara fibrosa (Ag.Ex Bruz)
1992
Guha, P. (Indian Institute of Technology, Kharagpur (India). Agricultural Engineering Dept.)
During the programme of herbicidal control of the rice field aquatic algal weed Chara, the effect on some of the physiological parameters of alga were also noted in laboratory experiments in 1985. The observations were recorded on the phytotoxicity percentage, chlorophyll, protein and dry matter contents of the weed at 24, 48 and 96 h of treatment with the promising herbicides like copper sulphate, oxadiazon and their combinations at different concentrations ranging from 1 to 5 ppm. All the treatments induced some form of physilogical disorders and the phytotoxicity rating increased with time. There was significant reduction in chlorophyll and dry matter contents with a concomitant increase in protein content. Such changes were most discernible at 96 h of treatment. The decrease in chlorophyll content due to the application of copper sulphate was maximum followed by the combined treatment which however caused maximum decrease in dry matter content. There was a very rapid absorption of copper and its uptake was found to increase with the increase in its concentration in the medium.
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