Vol. 10, Issue 8 (2021)

Author(s):
MK Jena and SK Pattanayak

Abstract:
The present investigation was carried out to study the long term effect of integrated nutrient management under cereal-vegetables-pulses cropping system on soil organic carbon at College of Agriculture, OUAT, Bhubaneswar. The treatments consisted of different combinations of inorganic fertilizers, organics (FYM and vermicompost), ameliorant (lime) and biofertilizers. At the end of 14^th crop cycle (5 years) and 29^th crop cycle (10 years), the effect of various treatments were studied. The results showed that organic carbon stock and build up was higher in the integrated treatments of STD with FYM/vermicompost, biofertiloizers and lime at both surface and sub-surface soil. Sole use of inorganics (STD) resulted in lower amount of soil organic carbon (SOC) sequestration. Integration of inorganics with organics resulted in improvement in SOC sequestration and further gain was observed in integration with organic, biofertilizers and lime. The amount of soil organic carbon sequestration (Mg C ha^-1) varied as control (0.89) < STD (1.24) < STD + VC (1.53) < STD + F (1.69) < STD + VC + BFs (2.76) < STD + F + BFs (2.96) < STD + F + L + BFs (3.31) < STD + VC + L + BFs (4.27) in 10 years of cropping. The SOC sequestration rate followed similar trend. Irrespective of INM practice and years of cropping very labile carbon fraction was most predominant followed by labile and less labile carbon fraction. Integrated treatment of STD with organics, biofertilizers and lime influenced the various soil organic carbon fractions much more compared to other treatments.