01872nam a2200133 a 450000100080000000500110000800800410001910000240006024501200008426000420020430000100024650000200025652014620027613308482002-11-22       1988    bl uuuu  m   00u1 u    #d1 aCASTRO FILHO, C. de  aEffects of liming on characteristics of a Brazilian oxisol at three levels of organic matter as related to erosion.  aColumbus: Ohio State Universityc1988  a261p.  aTese Doutorado.  aAn oxicol from southern Brazil was characterized for parameters related to the effects of liming on soil stability and erosion. The parameters measured were soil mineralogy, PZSE, pH, soil solution chemistry, moisture retention, pore size distribution, particle and bulk density, aggregate size distribution, effect of ionic strength, organic matter and pH lon splash, and effect of lime on runoff, infiltration, saturation time and soil losses. The experimental sites, LC, LM, and CA had increasing carbon contents. Exchangeable acidity was neutralized in field plots to give a pH range of 3.5 to 6.5. Main results were: the Lc and LM soils contained more kaolinite than CA soil. CA soil had more gibbste. The amount of organic carbon had little effect on the PZSE.  InLC and LM soils maximum aggregate size occurred when 100 % of the exchangeable acidity was neutralized. Al-polymerization and adhesion to soil particles increased aggregate size. Splash decreased with increasing pH and the effect of pH was modified by ionic strength. Both splash and soil loss decreased with increasing pH of the field-limed plots. Splashed soil as function of pH and organic matter behaved in a manner opposite to the aggregation data, for the same pH. When splash decreased, aggregation increased. Soil splash was also proportional to moisture content regardless of the soil bulk density. Soil loss was reduced when the limed plots were compared to the unlimed pilots.