WATER RETENTION IN SOIL UNDERLAIN BY A COARSE-TEXTURED LAYER

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Abstract
A theoretical development is presented that describes water retention in soils underlain by a coarse-textured stratum, and incorporates the physical characteristics of the overlying soil, the depth to the coarse layer, and the coarseness of the underlay. Field data are presented for the Manawatu fine sandy loam, a soil with a coarse layer at 90 cm. For this soil the layering resulted in an additional 5.5 cm of water storage at field capacity, an increase of 31% over a similar hypothetical soil with the coarse stratum absent.

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