NDLI: A cation exchange resin method for measuring long-term potassium release rates from soil

Content Provider	Springer Nature Link
Author	Askegaard, M. Hansen, H. C. B. Schjoerring, J. K.
Copyright Year	2005
Abstract	The aim of the present study was to determine long-term K release rates from soil by use of a modified resin method, where vigorous agitation and soil–resin separations were avoided to minimise the dissolution of the soil minerals. Resins saturated with Ca$^{2+}$ or H$^{+}$ were tested; Ca$^{2+}$ because it is the most dominating cation on the soil exchange complex, and H$^{+}$ because it is an important K$^{+}$ counter-ion released from plant roots. The tested soil: resin systems included two rates of agitation; no agitation, and gentle agitation where the soil particles visually did not move relative to each other. The resin beds were kept physically separated from the soil particles by use of a specially designed extraction tube. Three soils of the same mineralogical and textural origin, but exposed to different K input levels during more than 80 years, were used. A pot experiment with ryegrass was carried out using the same three soils. Vigorous shaking of the resin–soil systems was not needed to obtain a sufficiently high and rapid K release to the resin; even without agitation long-term K release rates could be determined. The accumulated K release was in all combinations of agitation rate, resin saturation ion and soil K status proportional to the square root of extraction time after 1000 h of extraction, indicating diffusion controlled K release from the minerals. Resin extractable K was closely correlated with ryegrass K uptake, indicating similarity in the extraction process. In contrast, K extracted with ammonium acetate or nitric acid did not provide information about the ability of the soils to release K in the long term. Based on the criteria :(i) substantial K adsorption under slow K release conditions; and (ii) achievement of a stable long-term K release within a limited extraction period, the Ca-saturated resins with gentle agitation and H-saturated resins without agitation are concluded to be best suited for routine laboratory work.
Starting Page	63
Ending Page	74
Page Count	12
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	271
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cation exchange resin long-term release potassium release rate Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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