title: Dynamics of organic carbon and microbial biomass in alluvial soil with tillage and amendments in rice-wheat systems.
abstract: Rice-wheat cropping systems of the Indo-Gangetic plains (IGP) occupying 12 million ha of productive land are important for the food security of South Asia. There are, however, concerns that yield and factor productivity trends in these systems are declining/stagnating in recent years. Decrease in soil organic carbon is often suggested as a reason for such trends. A field experiment was conducted to study the soil organic carbon (SOC) and soil microbial biomass carbon (MBC) dynamics in the rice-wheat systems. Use of organic amendments and puddling of soil before rice transplanting increased SOC and MBC contents. Microbial biomass carbon showed a seasonal pattern. It was low initially, reached its peak during the flowering stages in both rice and wheat and declined thereafter. Microbial biomass carbon was linearly related to SOC in both rice and wheat indicating that SOC could be used as a proxy for MBC.
authors.affiliation: Division of Environmental Sciences, Indian Agricultural Research Institute, New Delhi, 110 012, India.
authors.forename: B
authors.initials: B
authors.lastname: Banerjee
authors.forename: P K
authors.initials: PK
authors.lastname: Aggarwal
authors.forename: H
authors.initials: H
authors.lastname: Pathak
authors.forename: A K
authors.initials: AK
authors.lastname: Singh
authors.forename: A
authors.initials: A
authors.lastname: Chaudhary
mesh_terms: D018533:Biomass; D002244:Carbon / Q000032:analysis*; D017753:Ecosystem; D012275:Oryza / Q000254:growth & development*; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D014908:Triticum / Q000254:growth & development*
chemical_list: D012987:Soil; D002244:Carbon