Authors : G. S. Shinde
Page Nos : 45-47
Description :
The effect of commonly used pesticides organophosphate, Rogor and organochlorine, Endotaf Pesticides was observed on total nitrogen content of Nostoc punctiforme in the nitrogen free BG-11 medium with 2.5, 5, 10, 20, 50, 100, 250 and 500 ppm concentrations of each pesticide. In the laboratory cultures, after 28 days of harvesting total nitrogen fixed by the Nostoc punctiforme species was estimated by conventional Micro- kjeldahl method at each concentration of both the pesticides. The pragmatic results revealed that, the organophosphate, Rogor was comparatively less toxic than organochlorine, Endotaf pesticide to the Nostoc punctiforme. Further, a progressive decline in the total nitrogen content of the was occurred with increasing concentrations of both the pesticides. Endotaf was found to be highly toxic than the Rogor to the tested Nostoc punctiforme. Further it was concluded that at the recommended doses of field application, Rogor and Endotaf had no deleterious effect on nitrogen fixation of Nostoc punctiforme.
Keywords: Nostoc punctiforme, Rogor and Endotaf, Total Nitrogen fixation.
