DIFFERENTIAL RESPONSE OF VIGNA RADIATA L. TO VARIED DOSES OF CHLORPYRIFOS

Twenty-day old seedlings were exposed to different concentrations ranging from 0-1.5mM of chlorpyrifos through foliar spray in the field condition. The seedlings were uprooted for analyses and observed at the preflowering (five days after treatment, DAT), flowering (10 DAT) and post-flowering (20 DAT) stages for various morphological parameters such as plant height, number of branches, leaves per plant, total leaf area, plant biomass and photosynthetic pigments viz. Chlorophyll (Chl) a, Chl b, Total Chl, and Carotenoid (Car) content. Yield attributing characters like number of pods plant(-1), number of seeds pod(-1) and weight of 100 seeds were analyzed from both control and treated plant after harvest stage. All the growth parameters, pigments' activity and yield parameters increased at 0.3mM insecticidal treatment, when compared with control. Further increases in insecticide level had a negative impact upon all studied parameters.