Chemical attributes of some queensland acid soils. Ii. relationships between soil and soil solution phase compositions

Bruce, R. C., Bell, L. C., Edwards, D. G. and Warrell, L. A. (1989) Chemical attributes of some queensland acid soils. Ii. relationships between soil and soil solution phase compositions. Australian Journal of Soil Research, 27 2: 353-364. doi:10.1071/SR9890353


Author Bruce, R. C.
Bell, L. C.
Edwards, D. G.
Warrell, L. A.
Title Chemical attributes of some queensland acid soils. Ii. relationships between soil and soil solution phase compositions
Journal name Australian Journal of Soil Research   Check publisher's open access policy
ISSN 0004-9573
Publication date 1989-05-01
Sub-type Article (original research)
DOI 10.1071/SR9890353
Open Access Status Not yet assessed
Volume 27
Issue 2
Start page 353
End page 364
Total pages 12
Language eng
Subject 2304 Environmental Chemistry
1111 Soil Science
Abstract Relationships were sought between soil and soil solution attributes by using the data of Bruce et al. (Part 1). There was a strong linear relationship between EC of soil solutions and EC of 1: 5 soil: water extracts (r =0•904). in subsoils, the activity of Al in soil solution was dependent on soil solution ionic strength and soil Al saturation, and was described by the following multiple regression equation: (Formula Present) Similar equations were derived for the relationships between Al saturation, ionic strength and either soil solution pH or soil pHj:5• For soil pH, the ionic strength value in the equation was that of the 1: 5 suspension. Soil solution pH was linearly correlated with soil pH in water (r = 0•649) and 0•01 M CaCl (r = 0.763). Soil solution Ca concentration was not well correlated with exchangeable Ca or Ca saturation. The concentration of Mg in soil solution exceeded that of Ca in soils with an exchangeable Ca: exchangeable Mg ratio less than about 2. The importance of ionic strength in chemical equilibria involving Al in soil solution is discussed in relation to the occurrence of Al toxicity, the diagnostic use of Al saturation, and the relationship between Al saturation and soil pH. In acid soils, it is suggested that Altoxicity may occur intermittently, while Ca limitations to plant growth, especially in subsoils, may be more widespread than previously estimated.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
 
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