The influence of organic matter extracted from humified clover on the properties of amorphous aluminosilicates.II. Phosphate retention

Soil Research ◽  
1978 ◽  
Vol 16 (3) ◽  
pp. 341 ◽  
Author(s):  
KW Perrott
Keyword(s):  
Organic Matter ◽  
Degree Of Polymerization ◽  
Water Soluble ◽  
Soluble Organic Matter ◽  
Retention Capacity ◽  
Phosphate Retention ◽  
Soil Clay ◽  
Charge Balancing ◽  
Allophanic Soil ◽  
Organomineral Complexes

Freshly formed water soluble organic matter extracted from humified clover leaves was used to treat a range of amorphous aluminosilicates and hydrous alumina. Phosphate retention isotherms were determined on the resulting organomineral complexes. These isotherms revealed the influence of the organic matter on phosphate retention by amorphous aluminosilicates. The organic treatment was found to reduce phosphate retention by hydrous alumina and amorphous synthetic aluminosilicates with high and low Al/(Al+Si) mole ratios. There was no depression of phosphate retention with amorphous aluminosilicates of intermediate composition. Similarly, the phosphate retention capacity of an allophanic soil clay of intermediate Al/(Al+Si) mole ratio was not reduced by organic treatment. These results appear to be related to the degree of polymerization of charge balancing hydroxy-aluminium in the aluminosilicates.

Mobility of soil water-soluble organic matter during rice cultivation

2012 ◽  
Vol 38 (1) ◽  
pp. 40-42 ◽  
Author(s):  
O. A. Gutorova ◽  
A. Kh. Sheudzhen ◽  
A. G. Ladatko
Keyword(s):  
Organic Matter ◽  
Soil Water ◽  
Rice Cultivation ◽  
Water Soluble ◽  
Soluble Organic Matter

Water-soluble organic matter and biological activity of a degraded soil amended with pig slurry

2007 ◽  
Vol 378 (1-2) ◽  
pp. 101-103 ◽  
Author(s):  
Diana Hernández ◽  
José M. Fernández ◽  
César Plaza ◽  
Alfredo Polo
Keyword(s):  
Organic Matter ◽  
Biological Activity ◽  
Water Soluble ◽  
Pig Slurry ◽  
Soluble Organic Matter ◽  
Degraded Soil

The influence of organic matter extracted from humified clover on the properties of amorphous aluminosilicates. I. Surface charge

Soil Research ◽  
1978 ◽  
Vol 16 (3) ◽  
pp. 327 ◽  
Author(s):  
KW Perrott
Keyword(s):  
Surface Charge ◽  
Negative Charge ◽  
Positive Charge ◽  
Degree Of Polymerization ◽  
Aqueous Extracts ◽  
Hydrous Oxides ◽  
Soil Clays ◽  
Charge Balancing ◽  
Inorganic Components ◽  
Allophanic Soil

A series of synthetic amorphous aluminosilicates, hydrous oxides and allophanic soil clays were treated with aqueous extracts of humified clover. The resulting changes in surface charge due to organic treatment were determined by comparing the charge characteristics of these organic treated samples and samples treated with a synthetic mixture of the inorganic components of the humified clover extract. Organic treatment caused a change of net surface charge to more negative values. The change in surface charge varied with the mole ratio Al/(Al+Si) of the aluminosilicate, being largest at low values of Al/(Al+Si). Where the aluminosilicates contain positive charges these are reduced by the organic treatment. This is a major contributor to the alteration of net surface charge in the more aluminous samples. The effect of organic treatment on the charge characteristics of allophanic soil clays was similar to that for the synthetic aluminosilicates of intermediate composition. The inorganic treatments also caused an increase in negative charge, and this is attributed to the neutralization of positive charge by the adsorption of phosphate and the removal of charge-balancing aluminium-hydroxy material. The effect of the organic and inorganic treatments on the positive and negative charge components of amorphous aluminosilicates is discussed in terms of the degree of polymerization of chargebalancing hydroxy-aluminium as envisaged in current models of the structure of amorphous aluminosilicates.

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