Physical environment near the surface of plowed and no-tilled soils

摘要: Mechanical tillage is a dynamic soil process that influences the physical environment near surface, thus affecting biological processes in soil. Water content, bulk density, air permeability, hydraulic conductivity and organic carbon were compared for moldboard plowed non-tilled conditions at five locations from east-central U.S.A. to Great Plains. Soils Blount, Maury, Nicollet, Webster Crete-Butler cropped continuous corn (Zea mays L.), Alliance Duroc wheat/fallow (Triticum aestivum L.). Major differences characteristics between practices largely confined top 75 mm of The volumetric water (C) contents 0–150-mm layer time sampling ranged 8 66% 12 75% higher, respectively, no-tilled than soils. Bulk density was greater total porosity surface as much 10% less treatments. Because generally higher and/or lower porosity, water-filled pore space (WFPS) soils 6–28% Air permeability plowed, but there no due 75–150-mm depth. Physical influence regime, thereby affect rate reactions At many points drying cycle, added usually creates aerobic adding same amount counterpart.