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Anionic Effects on Potassium Reactions in Variable‐Charge Atlantic Coastal Plain Soils
Author(s) -
Sadusky M. C.,
Sparks D. L.
Publication year - 1991
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/sssaj1991.03615995005500020012x
Subject(s) - loam , soil water , ultisol , adsorption , coastal plain , chemistry , potassium , geology , soil science , organic chemistry , paleontology
To better understand the role anions play in the rate of cation adsorption, the effect of anions on K mobility, retention, and rate of K reactions in two variable‐charge Atlantic Coastal Plain soils was investigated. The soils studied were a Rumford loamy sand (coarseloamy, siliceous, thermic Typic Hapludult) and a Kenansville loamy sand (loamy, siliceous, thermic Arenic Hapludult). The effects of ClO 4 , Cl, SO 4 , PO 4 , and SiO 3 on the rate and magnitude of K adsorption on the two soils was investigated at pH 5 and 6 using a stirred‐flow kinetic technique. The type of anion present had little, if any, effect on the rate of K adsorption, but had an effect on the amount of K adsorbed. In general, the amount of K adsorbed in the presence of a particular accompanying anion was of the order SiO 3 > PO 4 > SO 4 > Cl > ClO 4 . When SiO 3 was the accompanying anion in a 20 mg K L −1 solution, K adsorption on the Rumford soil was as high as 358 mg K kg −1 , vs. a K adsorption maximum of only 58 mg K kg −1 when ClO 4 was the accompanying anion. Likewise for the Kenansville soil, the SiO 3 maximum was 321 mg K kg −1 while the ClO 4 maximum was only 89 mg K kg −1 . These studies demonstrate the role anions play in K retention and mobility, specifically on variable‐charge Atlantic Coastal Plain soils.