Division s-6-Soil And Water Management and conservation And Conservation

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Date
1983
Authors
ALLAN JONES2 C.
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Abstract
Published and unpublished data from 10 studies were analyzed to determine the effects of soil texture on critical built densities for rooting at near-optimum soil water contents. Highly significant negative relationships were found between percentage clay or silt + clay and the built density at which rooting was at a maximum or the built density at which rooting was 0.2 of that maximum. Similar relationships were also found between percentage clay or silt + clay and (i) the built densities of soil layers classified as fragipans and (ii) the maximum built densities at which "many" roots are reported in U.s. Soil Conservation Service pedon descriptions. Thus, soil texture can be used to estimate built densities of fragipans and critical built densities at which root growth is severely affected at near optimal soil water contents.
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East African Agricultural And Forestry Journal, 47, p. 1208-1211