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VARIABILITY IN THREE AREAS OF THE DENCHWORTH SOIL MAP UNIT.
Author(s) -
BASCOMB C. L.,
JARVIS M. G.
Publication year - 1976
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1976.tb02012.x
Subject(s) - cretaceous , soil map , geologic map , series (stratigraphy) , soil water , geology , spatial variability , soil series , unit (ring theory) , soil science , hydrology (agriculture) , physical geography , geography , paleontology , soil classification , mathematics , statistics , geotechnical engineering , mathematics education
Summary Variability of soil within three areas of the Denchworth map unit in southern England Has been investigated by describing and analysing samples from thirty profiles located at the intersects of a randomly oriented grid. The Denchworth series has been mapped over several stratigraphically different clays, and the areas chosen provide three groups of profiles developed over Gault (Cretaceous), Kimmeridge, and Oxford (Jurassic) Clay respectively. Purity of the map unit, estimated as the percentage of profiles whose data agree with the definition of the Denchworth series, was 60 per cent, which is comparable with values for other map units both near by and elsewhere. The variability of individual properties as indicated by coefficients of variation differed widely. Generally, physical properties were more uniform than chemical properties. The Denchworth map unit can consequently be treated uniformly for aspects of land management related to soil physical properties but it provides little guidance for fertilizer application. A small amount of variability can be attributed to mapping together those soils developed in material derived from stratigraphically different clays, but is insufficient to justify separating them.