Long term effect of inorganic fertilizers and organic manures on soil fertility status, microbial biomass carbon, and yield of rice on inceptisol

Abstract

The experiment was conducted during the kharif season at research farm, Indira Gandhi Krishi Viswavidyalaya, Raipur to investigate the long term effect of Inorganic fertilizer and organic manures on soil fertility, microbial biomass carbon and yield or rice. The soil was sandy loan and locally known as matasi, neutral in pH, Low in nitrogen, medium in P and K. the experiment was laid in RBD and replicated three times with eleven treatment T1 -No Fertilizer, No Organic manure (Control),T2 -50% Recommended NPK (40:30:20), T3-75% Recommended NPK,T4-100% Recommended NPK (80:60:40),T5-50% Recommended NPK +50%N through Farm yard manure,T6 -75% Recommended NPK +25%N through Farm yard manure,T7-50% Recommended NPK +50%N through rice residue,T8-75% Recommended NPK +25%N through rice residue,T9-50% Recommended NPK +50%N through Green manure,T10-75% Recommended NPK +25%N through Green manure,T11- Conventional Farmer’ Practice (50:30:20). A medium duration high yielding rice variety Mahamaya was taken as test crop. The results revealed that combination application of inorganic fertilizer and organic manure i.e. integrated of fertilizer and manure improve chemical propertied of soil like organic carbon, available N, P, and K status in soil microbial biomass in soil as compare to absolute and alone inorganic fertilizer. Application of organic (FYM, Rice residue, Green manure) with inorganic fertilizer in rice along with 50 and 75 % RDF gave higher soil organic carbon available P and MBC content of soil as compared to control. The result revealed that MBC positively significant correlated with organic carbon, available N, P and K and yield of rice.