TAILIEUCHUNG - Soil aggregate stability and aggregate-associated carbon fractions under different tillage systems of rice-wheat rotation in North India

The influences of tillage systems on soil carbon (C) stocks have been studied extensively, but the distribution of soil C within aggregate fractions is not well understood. This review study was to determine the influences of various tillage systems on soil aggregation and aggregate-associated C under rice-wheat rotation in North India. The NT and RT treatments significantly increased the proportion of macro-aggregate fractions (>2000 and 250-2000μm) compared with the MP-R and MP+R treatments. Averaged across all depths, mean weight diameters of aggregates (MWD) in NT and RT were 47 and 20% higher than that in MP+R. The difference of total SOC stocks between NT and CT decreased with soil depth, confirming that the SOC benefits of NT are concentrated to the immediate topsoil still subject to direct seeding. The topsoil achieved maximum SOC stocks after about 10 years of NT. In surface soil, the maximum () and minimum () proportion of total aggregated carbon was retained with >2 mm and – mm size fractions, respectively. DSR combined with zero tillage in wheat along with residue retention (T6) had the highest capability to hold the organic carbon in surface ( g kg-1soil with the highest stratification ratio of SOC (). A considerable proportion of the total SOC was found to be captured by the macro-aggregates (>2– mm) under both surface () and sub-surface layers () leaving rest amount in microaggregates and silt + clay sized particles. However increasing the quantity of C input could enhance soil C sequestration or reduce the rate of soil C loss, depending largely on the local soil and climate conditions. | Soil aggregate stability and aggregate-associated carbon fractions under different tillage systems of rice-wheat rotation in North India

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• Tillage systems
• Aggregateassociated C
• Soil organic carbon
• Aggregate stability
• Different tillage systems
• Rice wheat rotation
• Physical and chemical soil properties
• Spring barley yield
• No tillage led
• Barley yield
• Rice residue load
• Zero tillage
• Growth and productivity
• Wheat under tillage systems
• Residue loads in Tarai region
• Grain yield component
• Reduced soil tillage
• Winter wheat
• Conventional tillage
• Cropping systems
• Tillage techniques
• Comparing tillage systems
• Developed infiltration method
• Sandy clayey loam soil
• Wetting drying cycles
• Population dynamics
• Weed diversity indices
• Conservation tillage
• Viable weed seed density
• Water productivity
• Durum wheat
• Grain quality
• Grain yield
• Herbicide tillage
• Reduced tillage systems
• Planting systems
• Seed cotton yield
• Agricultural production
• High volume instruments motion
• No till sowing
• Reduced tillage
• Seed yield
• Sesamum indicum L
• Agricultural systems
• Minimum tillage
• Penetration resistance
• Bulk density
• Wheat yields
• Zinc fractions
• Permanent bed
• Conventional tillage cropping systems
• Conservation agriculture
• Short term effect
• Tillage system
• Cropping system
• Residue management
• Soil organic fractions
• Affected soil organic carbon
• Soil quality index
• Indo gangetic plains
• Residue management in jute
• Jute (Corchorus spp )
• Foliar application
• Crop Residue
• Temperature stress
• Moisture regimes
• Soil health
• Carbon fractions
• Dryland agriculture
• Tillage operations
• Cropping patterns
• Soil properties
• Crop productivity
• Soil enzyme
• Soil quality
• Diverse cropping systems
• Soil enzyme activity
• Residue management practices
• Technologies
• Systems Engineering
• robotic
• mechanical
• anatomy
• Crop establishment methods
• Drum seeder
• RiceWheat system
• Profitable DSR wheat ZT in –rice wheat system
• Irrigation levels
• Enhancing yield
• Water productivity of wheat
• Wheat (Triticum aestivum)
• Light textured soil