Productivity of wheat and soil organic carbon status under integrated use of organic and inorganic fertilizers

摘要

A field experiment was conducted during 2004-05 to 2008-09 at New Delhi to find out the suitable combination of organic manure, biofertilizer and chemical fertilizer on wheat yield and soil organic carbon status in rice-wheat cropping system. The experiment consists 17 treatments combinations of three doses of chemical fertilizer (40,80 and 120 kg N/ha), two biofertilizers (Azotobacter and BGA) and one organic manure (FYM). Results revealed that grain yield of wheat increased significantly due to theapplication of Azotobacter and FYM or in combination with chemical fertilizer. The increase in grain yield due to the combined application of 2 organic inputs was higher as compared to single input. The application of 3 organic inputs with N40 and N80 gave yield enhancement which was higher than 30 kg N/ha. The treatment having absolute control showed a decline in soil organic carbon (SOC). SOC content in soil at crop harvest was significantly increased due to integrated application of biofertilizers and FYM as compared to chemical fertilizer alone. Integrated application of single biofertilizers and FYM maintained the SOC level while combined application of 2 or 3 biofertilizer / FYM enhanced the SOC level over the years.