Release of Nonexchangeable Potassium by Greenhouse, Neubauer, and Laboratory Methods

Effect of tractor weight, depth of ploughing and wheel placement during ploughing in an organic cereal rotation on contrasting soils

“…Contents of plant-available P, K, Ca and Mg were determined by ICP-ES after extraction with a mixture of ammonium lactate and acetic acid (Egné r et al, 1960). Acid-soluble K was extracted from the soil samples according to Reitemeier et al (1948). Soil pH was measured in a soil-water suspension (1.0:2.5, w/w).…”

Potassium Fixation in Some Kenyan Soils

“…In this study, a solution of a calcium salt was preferred to ammonium acetate as used by some workers (e.g. Reitemeier et al, 1947), since calcium is frequently the dominant soil solution cation. Moreover, there is evidence that ammonium acetate may extract more potassium than is in exchange equilibrium with calcium and magnesium in the soil solution (Matthews and Beckett, 1962).…”

A nano-scale study of the mechanisms of non-exchangeable potassium release from micas

“…Methods commonly used to determine the NEK often involve chemical extraction with dilute or concentrated acids, typically nitric acid (HNO 3 ) or hydrochloric acid (HCl) (Andrist-Rangel et al, 2013;Ghosh and Singh, 2001;Øgaard and Krogstad, 2005;Reitemeier et al, 1948), or a large excess of displacing cations such as sodium tetraphenylboron (NaTPB) (Cox and Joern, 1997;Cox et al, 1999;Fabián et al, 2008;Jonathan et al, 2014;Schulte and Corey, 1965;Vetterlein et al, 2013;Wang et al, 2010;Wentworth Sally and Rossi, 1972). Previous studies have shown that release of NEK from micas via the chemical extraction method proceed by exchanging the adjacent interlayer K + with hydrated cations and the dissolution of micas, resulting in the formation of weathering products (Andrist-Rangel et al, 2013;Darunsontaya et al, 2010;Jalali, 2005;Mortland and Ellis, 1959;Reed and Scott, 1962;Srinivasa Rao et al, 2006).…”