Phytotoxic Effect to Cockscomb (Celosia cristata L.) with Response of Chlorpyrifos Treatments

The present work was conducted to evaluate the phytotoxic of chlorpyrifos on cockscomb ( Celosia cristata L.) plant.  The seeds was exposed different dosage (control, 0.5, 1, 2 and 2.5%) of chlorpyrifos. On the 7 th day seed germination percentage were determined, seedling morphological such as shoot length, root length, biomass and photosynthetic pigments like chlorophyll ‘a’ and chlorophyll ‘b’ were examined on 30, 60 and 90 days after treatments. The germination percentage negatively affect with increasing chlorpyrifos level. The morphological and photosynthetic pigments were increases at optimum level (0.5%). Moreover, above the optimum concentration all investigated parameters was decreased with increasing chlorpyrifos level. The obtained results suggest that usage of this insecticide optimum dosage helpful for good agricultural practices.