NDLI: Relationships between soil potassium supply characteristics based on soil solution concentration and buffer power and field responses of winter wheat and maize

Content Provider	Springer Nature Link
Author	Schneider, A. Castillon, P. Pellerin, S.
Copyright Year	2003
Abstract	The relationship between soil K supply, characterised by the soil solution K concentration and the soil K buffer power, and plant K status was investigated for field grown crops. The study was carried out in 15 K fertilisation trials with maize and wheat covering a wide range of agricultural soils and K level. Soil K buffer power was obtained through sorption–desorption curves. For each trial the critical K concentration in the soil solution was deduced from the relationship between the K concentration in the soil solution and the K concentration in shoot tissue water, which was considered as a relevant indicator of the plant K status. At sufficient K levels, the maximal K concentration in the shoot tissue water of maize (145 mM) was lower than that of wheat (175 mM) but the percentages of the critical K concentration in plant tissue water to this maximal K concentration were similar for the two plant species with an average of 75%. The critical K concentration in the soil solution varied between soils. However, a close correlation was found between the critical K concentration in soil solution and the inverse of the soil buffer power at this concentration (r $^{2}$=0.981) or the inverse of the square of buffer power (r $^{2}$=0.989). On a wide range of soils and field conditions, these two indicators were more able to account for K availability and plant response than exchangeable K content or K saturation ratio of the CEC.
Starting Page	269
Ending Page	278
Page Count	10
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	254
Issue Number	2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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