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Title

EFFECTS OF WETTING/DRYING, FREEZING/THAWING AND EARTH WORM ACTIVITIES ON SOIL HYDRAULIC PROPERTIES

Pages

 Start Page 340 | End Page 348

Abstract

 The purpose of this study was to asses the potential impact of physical and biological changes on soil HYDRAULIC PROPERTIES in the prepared soil columns. A clay loam (CL) and a sandy loam (SL) soil, were used for the two types of repacked and REPAIRED SOIL columns. For this purpose the soil was passed through a 8-mm sieve and poured into large cylinder. In total, 24 columns were prepared out of which 8 columns were used as repacked columns and the rest (16 columns) were installed in the field under effects of wetting/drying and freezing/thawing cycles (physical changes). Of the physically changed columns 8 columns were subjected to earth worm activity (biological changes). All experiments were conducted with four replicates. Applied experimental treatments (averaged over physical and biological changes and soil texture) caused a decrease in bulk density (6.5%) and an increase in macropore (39.8%), mesopore (32.8%), micropore (20.0%), filed capacity (28.4%), wilting point (7.5%), available water content (43.3%) and the volumetric water content at 5 cm matric suction (28.1%) through soil columns. The grater values of these properties were shown in clay loam soil which confirms the greater affinity of clay in regeneration of soil structure and soil pore improvement. These changes verify the effects of WETTING AND DRYING and FREEZING AND THAWING cycles in modification of soil structure.

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