Shear strength of aggregates compared with bulk soil of two haploxerolls from Chile

摘要: Shear strength of aggregates and the bulk soil matrix in two Haploxeroll central Chile was assessed order to determine: (1) effect previous tillage on shear parameters between (2) effects structure development differences dry-wet mechanical parameters. Undisturbed cylinders single (0-10 cm layer) were collected from untilled conventionally tilled sites Santiago (STG) Mapocho Soil Series (MPC). General properties determined. The tests conducted confined free-draining cores, equilibrated at field capacity air-dried, obtain data cohesion angle internal friction samples. Dry showed 40 70% greater compared STG MPC soils, respectively, associated with a decrease coarse porosity organic matter soil, thus reducing its friability. In air-dried condition, developed 6-7 fold difference increased (9-13 fold) samples sites. cores higher values when (68° average, 43° individual aggregates), but -33kPa water tension tendency reversed. results this study confirm that smaller wet dry behaviour are better structural lower intensity.