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The Characterization of Slope Positions and Their Influence on the Total Nitrogen Content of a Few Virgin Soils of Western Iowa
Author(s) -
Aandahl Andrew R.
Publication year - 1949
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1949.036159950013000c0081x
Subject(s) - soil survey , citation , soil water , library science , environmental science , soil science , computer science
D the period from 1936 to 1942, inclusive, more than 2,000 sample corn yields were harvested from Tama, Marshall, Fayette, and Grundy soils in Iowa (4, 6). The effects on corn yields of A horizon depth and slope gradient were given primary consideration. Variations of A horizon depth and organic matter content within a soil series may result from many causal factors. One of these is the differences which existed in the original depths of the A horizon. During the analysis of the corn yield data it soon became apparent that the corn yield differences were caused by several factors in addition to erosion. In order to obtain some measurement of this original variability of the A horizon a study of a virgin area was made. Samples of several virgin soil profiles were collected and studied. These virgin soil profiles vary in part because they have different plantmicroclimates which are related to topography. Geological erosion was also a factor.