Department of Soil Science and Agricultural Chemistry, J.N. Krishi Vishwavidyalaya, Jabalpur, Madhya Pradesh, 482004
1Present address: R.A.K. College of Agriculture, JNKVV, Sehore, Madhya Pradesh
After 25 years of Long-term Fertilizer Experiment at Live Stock Farm, JNKVV, Jabalpur it was found that chemical fertilization did not have any negative impact on Nitrosomonas, Nitrobacter and Azotobacter population although they were enhanced as compared to control. Recommended dose of NPK without sulphur was less effective for Nitrosomonas and Azotobacter. FYM application was much superior in maintaining the soil biological health which ultimately reflected on ammonical and nitrate nitrogen. Crop rhizosphere also played a significant impact on the microbial population and mineral nitrogen. Nitrogen transformation was significantly increased by Nitrosomonas and Nitrobacter population in different treatments, it was also increased with increasing levels of NPK.
Long-term effect, Azotobacter, nitrifiers
