The availability of soil phosphate. I.—Examination of the soil solution with special reference to the fixation of phosphate

1951 ◽  
Vol 2 (4) ◽  
pp. 186-192 ◽  
Author(s):  
S. H. Yuen ◽  
A. G. Pollard
Keyword(s):  
Special Reference ◽  
Soil Solution ◽  
Soil Phosphate

Studies on the Phosphate Potentials of Soils IV The mechanism of the 'soil/solution ratio effect'

Soil Research ◽  
1966 ◽  
Vol 4 (1) ◽  
pp. 77 ◽  
Author(s):  
R.E White
Keyword(s):  
Uniform Distribution ◽  
Soil Solution ◽  
Environmental Conditions ◽  
Prolonged Storage ◽  
Soluble Phosphate ◽  
Ratio Effect ◽  
Adequate Measure ◽  
Soil Phosphate ◽  
The Mean

The equilibrium phosphate potentialSP and the slope of the quantity/intensity (Q/I) relation of three contrasted soils increased as the soil/solution ratio was decreased from 115 to 1/50. On allowing the soil phosphate to achieve equilibrium by prolonged storage under constant environmental conditions, the equilibrium potentialSP and the slope dQ/dI remained constant and independent of the soil/solution ratio. The 'soil/solution ratio effect' is interpreted in terms of phosphate disequilibrium, a condition common in soils in situ, which can be due to either non-uniform removal of phosphate or to non-uniform distribution of soluble phosphate recently added to the soil. The two kinds of disequilibrium cannot be distinguished by their observed soil/solution ratio effects, but may be identified by the direction of change of the potentialsp on the attainment of equilibrium in the soil. PotentialSP values measured in initially phosphate-free solutions are discussed with reference to their dependence on the soil/solution ratio. Aslyng's method of extrapolating to 'zero dilution' gives a reasonably accurate measure of the true potentialSP of an 'equilibrium' soil, but is in error for a 'disequilibrium' soil. It is suggested that the equilibrium potentialSP determined at a 1/50 (or smaller) soil/solution ratio will provide an adequate measure of the mean potentialSP of a disequilibrium soil.

scholarly journals Fine scale measurement and mapping of uranium in soil solution in soil and plant-soil microcosms, with special reference to depleted uranium

2012 ◽  
Vol 368 (1-2) ◽  
pp. 471-482 ◽  
Author(s):  
Susan Tandy ◽  
Susan R. Brittain ◽  
Barry M. Grail ◽  
Cameron W. Mcleod ◽  
Eric Paterson ◽  
...  
Keyword(s):  
Special Reference ◽  
Soil Solution ◽  
Depleted Uranium ◽  
Fine Scale ◽  
Soil Microcosms ◽  
Plant Soil
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