ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
2+ , and P fractions (unoccluded Fe-P and Al-P, occluded Fe-P and Al-P, and Ca-P) under oxidized, reduced, and reoxidized conditions. Reduction decreased Eh to moderately reduced (200-350 mV) and reduced (−100 to 100 mV) values, and increased pH (0.8 ± 0.1) and soluble Fe2+ (44 ± 24 mg/kg). Reoxidation returned Eh, pH, and Fe2+ to near initial values. Reduction increased soluble P in unamended cultivated topsoils (0.69 ± 0.42 mg/kg), decreased soluble P in amended cultivated topsoils (1.42 ± 1.31 mg/kg), but had little effect in subsoils or wooded soils. Reoxidation decreased soluble P in cultivated topsoils, but increased soluble P in subsoils and wooded soils. Reduction increased the extractability of all P fractions in cultivated topsoils (20 ± 12 mg/kg), but increased only Ca-P extractability in subsoils and wooded soils (9 ± 3 mg/kg). Reoxidation decreased the extractability of these fractions to near initial values.
Type of Medium:
Electronic Resource
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