Volume 6, Issue 3, June Issue - 2018, Pages:538-543
Authors: H. S. Jatav, S. K. Singh, J. S. Yadav
Abstract: A field experiment in randomised block design was conducted at Agriculture Research Farm, Banaras Hindu University, Varanasi, U.P. (India) to find out the effect of conjoint application of sewage sludge and fertilizers on soil microbial population of rice-wheat cropping system (RWCS). Total ten treatments consisting of sewage sludge and fertilizer was formulated. The study demonstrated that increase in bacterial population (10-6 cfu g-1) in treatment containing 30 t ha-1 SS+100% RDF where, 30 ton ha-1 sewage sludge was applied along with 100% RDF followed by treatments 20 t ha-1 SS+100% RDF where, 20 ton ha-1 sewage sludge was applied along with 100% RDF. The bacterial population subsequently decreased in remaining three crops after taking Ist rice. In case of Fungi (10-4 cfu g-1) the maximum population was in 30 t ha-1 Sewage sludge applied with 100% RDF which was followed by 20 ton ha-1 sewage sludge was applied along with 100% RDFwhere as Actinomycetes was maximum in 30 t ha-1 Sewage sludge applied with 100% RDF. There was depletion of microbial population in subsequent three crops after first rice crop in which sewage sludge was added. The minimum microbial population was found in treatment without fertilizer and sewage sludge in rice wheat cropping system.