Effect of Heavy Metal on Total Nitrogen in Soil

Gopalpur soil was taken to understand the effect of heavy metals on total Nitrogen. Solutions of analytical grade sulphate (SO4) salt each of zinc, copper and cadmium was applied singly and in combinations. Soil sample which receives no metal amendment was served as control. Control, Cu (3000 ppm), Cd (3000 ppm), Zn (3000 ppm), Cu+Cd (1500 ppm+1500 ppm), Cd+Zn (1500 ppm+1500 ppm), Cu+Zn (1500 ppm+1500 ppm), and Cu+Cd+Zn (1000 ppm+1000 ppm +1000 ppm) were the treatments of this experiment. All treatments were replicated three times. 0 day, 15 days, 30 days, 45 days and 60 days were selected as incubation periods. Total nitrogen content of the soil reduced at the end of the incubation. Cu (3000 ppm) alone and copper in combination with other metal, Cu+Cd (1500 ppm+1500 ppm) & Cu+Cd+Zn (1000 ppm+1000 ppm +1000 ppm), showed the most reduction of total nitrogen content.