Directional strength in aggregates as affected by aggregate volume and by a wet/dry cycle
作者:
A. HADAS,
期刊:
Journal of Soil Science
(WILEY Available online 1990)
卷期:
Volume 41,
issue 1
页码: 85-93
ISSN:0022-4588
年代: 1990
DOI:10.1111/j.1365-2389.1990.tb00047.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
SUMMARYReduction of aggregate size in the upper, tilled soil layer as a result of one wet/dry cycle was observed for sandy soil and clay soils. Bulk density of aggregates tended to increase as their size diminished for the clay after the wet/dry cycle, whereas similar changes in bulk density for the loam were observed only for aggregates smaller than 5.6 cm. Slaking and water‐drop impact seem to be the major factors in reducing the aggregate size of the sandy loam, while swelling and shrinkage affect clay aggregates of all size groups, but only aggregates smaller than 4.0 mm for the sandy loam.Tensile strength of the sandy loam aggregates was related to the axis along which the stresses were applied. A definite directional dependence of tensile strength was observed, e.g. the shorter the axis, the larger the tensile strength. The directional strength dependence was apparently not affected by one wet/dry cycl
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