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Some Chemical Changes Accompanying Profile Formation of the Nearly Level Soils Developed from Peorian Loess in Southwestern Iowa
Author(s) -
Ulrich Rudolph
Publication year - 1951
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/sssaj1951.036159950015000c0073x
Subject(s) - loess , section (typography) , citation , agricultural experiment station , library science , state (computer science) , productivity , agriculture , archaeology , geography , geology , mathematics , computer science , geomorphology , algorithm , economics , macroeconomics , operating system
TN A previous paper (7), the functional relationships . -*• of the Peorian, or Wisconsin, loess-distribution pattern in southwestern Iowa and certain morphological and physical properties of the nearly level Prairie soils, Wiesenboden soils, and Planosols were presented. To recapitulate, the thickness of the Peorian loess decreases in a southeasterly direction with increasing distance from the major source of loess supply, the Missouri River floodplain. Physical profile properties functionally related to this loess-distribution pattern are: (1) increasing clay content in, and decreasing depth to, the maximum clay accumulation horizon; (2) increasing formation, movement, and accumulation of fine (<0.06 /<.) clay; (3) increasing volume weight; (4) decreasing aeration and total porosity; and (5) decreasing permeability. The increases in volume weight and decreases in porosity and permeability are most prominent in the horizons of maximum clay accumulation, but they also occur to a lesser extent in the A2 horizon of maximum eluviation. As a continuation of the investigation of these nearlylevel soils to determine the relationships between their genesis and characteristics and the loess-distribution pattern, the data presented here relate to the changes in several chemical properties which accompany the changes in physical properties noted above for the five soil profiles along Traverse No. 3.