Land Use and Cropping Effects on Carbon in Black Soils of Semi-Arid Tropical India uri icon

abstract

  • Soil organic carbon (SOC) and rainfall are generallypositively related, whereas a negative relationshipbetween soil inorganic carbon (SIC) and rainfall withsome exception is observed. Land use pattern in blacksoil region (BSR) of the semi-arid tropical (SAT)India, consists of 80% under agriculture, followed byforest, horticulture, wasteland and permanent fallow.For sustainable agriculture on these soils, there is aconcern about their low OC status, which warrantsfresh initiatives to enhance their OC status by suitablemanagement interventions. In the BSR region, cotton,soybean and cereal-based systems dominate but it isnot yet clear as to which cropping system in the SATblack soils is most suitable for higher OC sequestration.Many short-term experiments on cotton orcereal-based systems clearly suggest that cotton orcereal-based cropping systems including leguminouscrops perform better in terms of SOC sequestrationwhereas soybean?legume combination do not add anysubstantial amount of OC. In sub-humid bioclimaticzones (1053?1209 mm mean annual rainfall), soybean isgrown successfully with wheat or fallowing, and SOCconcentration is maintained at 0.75% in the 0.30 m soillayer under integrated nutrient management. In view ofenhancement and maintenance of OC in many shorttermexperiments conducted in various agro-climatezones of SAT, it is realized that OC accumulation insoils of the semi-arid ecosystem with suitable croppingand management practices could be substantial especiallyin cotton?pigeon pea rotation, and thus the discussedcrop rotations in each major bio-climatic zonestand for wide acceptance by the SAT farmers

publication date

  • 2016
  • 2016