Studies on the Tolerance of Vigna Sinensis L. And Oryza Sativa L. To The Application of Pesticides

Abstract

In the present investigation, an attempt has been made to study the effect of two pesticides (DDT and Bordeaux mixture) commonly used in the agricultural production landscape, on seed germination and seedling growth of Vigna sinensis L. and Oryza sativa L. The objective of this study is to determine the rate of germination, radicle emergence, plumule elongation, biomass and the chlorophyll content of the two cultivar seeds exposed to five concentrations of the pesticides viz., 0.01%, 0. 1%, 1%, 2% and 4%. In general the seeds of both Vigna sinensis and Oryza sativa showed a marginal increase in the rate of germination, radicle elongation, plumule growth, biomass and chlorophyll content in 0.01 % over the control, when treated with both the pesticides . There was gradual decrease in rate of germination, radicle emergence, plumule elongation, biomass and the chlorophyll content at 0.1%, 1% and 2% concentrations of DDT and Bordeaux mixture. The maximum inhibition was observed in higher concentration of both the pesticides (4%).Though the total chlorophyll and chlorophyll a content decreased as the concentration of the pesticide increased, the chlorophyll b recorded an increase in the DDT treated seeds of Vigna sinensis. This research contributes to the phytotoxicity assessment database, and besides to lay the foundation for the use of Oryza sativa and Vigna sinensis as a phytoremediation tool for agricultural pesticide runoff .