Some properties of the soil solution and the colloids in certain Iowa soils

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1933
Authors
Killinger, Gordon
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Agronomy

The Department of Agronomy seeks to teach the study of the farm-field, its crops, and its science and management. It originally consisted of three sub-departments to do this: Soils, Farm-Crops, and Agricultural Engineering (which became its own department in 1907). Today, the department teaches crop sciences and breeding, soil sciences, meteorology, agroecology, and biotechnology.

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The Department of Agronomy was formed in 1902. From 1917 to 1935 it was known as the Department of Farm Crops and Soils.

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1902–present

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  • Department of Farm Crops and Soils (1917–1935)

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Agronomy
Abstract

The physical and chemical properties and bacteriological characteristics of a number of soils collected from various parts of Iowa were studied in an effort to determine what the possibilities were of distinguishing soil types in the laboratory. (1) No striking differences were observed in the physical and chemical properties which could be attributed to particular soil types. (2) Characteristic SiO2Al2O 3+Fe2O3 ratios were observed for each soil, but this property would not be considered sufficient to differentiate soil types. (3) Water extracts from soils did not show definite characteristics on which to base soil type separations, neither did the chemical analyses correlate with all of the chemical analyses of the soils. (4) Various ratios of water to soil yielded different amounts of soluble salts. However, not in all cases did the higher dilutions of water to soil yield the most soluble salts. (5) Studies on the base exchange complex of each soil indicated differences but what significance could be attached to some of the slight differences observed is a question. (6) The exchange complex of the Webster silty clay loam was distinctly more reactive than that of the other soils. (7) The bacteriological studies indicate that the soil colloids may have an important function in the life and growth of both the aerobic and anaerobic organisms found in soils.

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Sun Jan 01 00:00:00 UTC 1933