Potassium and stage of development relationships in some loess-derived soils of Iowa

Wells, Kenneth L.

doi:10.31274/rtd-180813-17460

Cited by 5 publications

(8 citation statements)

References 35 publications

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“…Potassium and Soil Formation in the Thin Loess/till Soils It has long been known that in general the loess-derived soils of western Iowa are higher in total potassium than eastern Iowa soils (Brown, 1914). Recent studies (Protz, 1965;Wells, 1963) on individual soil series have also shown that the clay fraction of western Iowa loess soils are in general higher in K. These studies related the differences in K status to climate, principally rainfall.…”

Section: Clay and Soil Formationmentioning

confidence: 98%

“…Several investigators have studied the potassium relationships in soils. Wells (1963) analyzed the <l^clay fraction of the B horizons of some loess derived soils and concluded that the nonexchangeable potassium, K, content decreases from west to east across the region as average an nual rainfall increases. In explaining the K distribution it was found o from a mineralogical study that the lOA clay minerals decreased from west o to east along with a corresponding increase in the 17A clay minerals.…”

Section: Potassium Relationshipsmentioning

confidence: 99%

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Relation of Nonexchangeable Potassium and Magnesium to Development in Some Midwestern Soils

Kovar¹,

Riecken

1976

Soil Science Soc of Amer J

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The nonexchangeable (NEx) potassium and magnesium status of the <1µm clay and other properties of the thin loess over till soils of northwestern and eastern Iowa were investigated to better understand the genesis and morphology of these soils and to provide a firmer basis for classification of this recently delineated group of soils. These soils are compared with similar soils from Illinois and Ohio to evaluate the regional effects of parent materials, vegetation, and climate.The Sac and associated soils from northwestern Iowa have a higher NEx K and Mg content, are less texturally developed, release more K with sodium tetraphenylboron, and have a higher illite content than the Dinsdale and associated soils from eastern Iowa. These differences are attributed to the less weathered condition of the northwestern Iowa soils, primarily because of the lower mean annual precipitation (MAP) in that area. These differences support the separation of the two groups of soils at the series level.The loess‐derived upper sola of the forested Iowa soils have about the same NEx K and Mg contents, but more illite, and are less texturally developed than the upper loess portion of the forested Illinois and Ohio soil profiles. The lower‐till‐derived sola of the Iowa soils have a lower NEx K, NEx Mg, and illite content than the Illinois and Ohio soils. These differences in characteristics support the separation of the Iowa thin loess over till soils from the Illinois and Ohio thin loess over till soils at the series level.

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Section: Clay and Soil Formationmentioning

confidence: 98%

Section: Potassium Relationshipsmentioning

confidence: 99%

Relation of Nonexchangeable Potassium and Magnesium to Development in Some Midwestern Soils

Kovar¹,

Riecken

1976

Soil Science Soc of Amer J

View full text Add to dashboard Cite

show abstract

“…Recent studies (Protz, 1965;Wells, 1963) on individual soil series have also shown that the clay fraction of western Iowa loess soils are in general higher in K. These studies related the differences in K status to climate, principally rainfall.…”

Section: Potassium and Soil Formation In The Thin Loess/till Soilsmentioning

confidence: 98%

“…Wells (1963) analyzed the <l^clay fraction of the B horizons of some loess derived soils and concluded that the nonexchangeable potassium, K, content decreases from west to east across the region as average an nual rainfall increases. In explaining the K distribution it was found o from a mineralogical study that the lOA clay minerals decreased from west o to east along with a corresponding increase in the 17A clay minerals.…”

Section: Potassium Relationshipsmentioning

confidence: 99%

Relation of nonexchangeable potassium and magnesium to development in some Iowa soils

Kovar

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“….2 Semiquantitative percentages of size fractionated silicate mineralogy with depth for the Harps, Ida and Fayette series based upon interpolation, extrapolation and interpretation of mineralogy given for Iowa soils in Khan (1991), Wells (1963), Wells and Riecken (1969), Ruhe (1984) and USDA-NRCS KSSL database (2015). ............................................................... Table 3.3 Silicate minerals identified in Iowa soils by Khan (1991), Wells and Riecken (1969) and Ruhe (1984) Table 3.4 Semiquantitative Si content partitioned by size fraction and with depth for Harps, Fayette and Ida soil series of Iowa.…”

Section: List Of Tablesmentioning

confidence: 99%

Corn seedling response to silicon amendments in three Iowa and one Chinese soil

Wang

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Potassium and stage of development relationships in some loess-derived soils of Iowa

Cited by 5 publications

References 35 publications

Relation of Nonexchangeable Potassium and Magnesium to Development in Some Midwestern Soils

Relation of Nonexchangeable Potassium and Magnesium to Development in Some Midwestern Soils

Relation of nonexchangeable potassium and magnesium to development in some Iowa soils

Corn seedling response to silicon amendments in three Iowa and one Chinese soil

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