Effects of manure amendment on soil chemical properties and hydrous oxides
Three Virginia soils with low, moderate, and high amounts of Fe and Mn oxides were amended with swine (Sus scrofa L.) manure at a rate of 100 mt haS in an incubation experiment conducted in the laboratory over 29 days. Changes in pH, redox potential (Eh), and forms of Fe and Mn were monitored in order to assess the effect of high rates of manure loading on the chemical properties of these soils. Manure additions caused immediate reductions of 175 to 325 mv in soil Eh by day 4, although Eh recovered to near untreated soil levels by the end of the study. Minimum Eh levels were related to initial Fe and Mn contents of the soils. Soil pH increased to 7 to 8 in all soils, and organic matter contents, initially 25 g kgS higher than control soils, decreased as decomposition proceeded. Soil Mn was rapidly solubilized under the reducing conditions present early in the incubation, as shown by increases in soluble, exchangeable, and adsorbed forms of Mn determined by sequential extraction. Reprecipitation of MnO2 occurred in the high-Mn soil by day 8, as Eh began to recover. These results suggest that toxicities of Fe and especially Mn, along with other trace metals associated with these oxides in soils, may result from high rates of organic waste addition to soils where reducing conditions may persist for some time.
- Research Organization:
- Virginia Polytechnic Institute and State Univ., Blacksburg
- OSTI ID:
- 6183601
- Journal Information:
- Soil Sci. Soc. Am. J.; (United States), Journal Name: Soil Sci. Soc. Am. J.; (United States) Vol. 49:4; ISSN SSSJD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AGRICULTURAL WASTES
ANIMALS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
DOMESTIC ANIMALS
ELEMENTS
ENVIRONMENTAL EFFECTS
FEDERAL REGION III
IRON
MAMMALS
MANGANESE
MANGANESE COMPOUNDS
MANGANESE OXIDES
MANURES
METALS
NORTH AMERICA
ORGANIC MATTER
ORGANIC WASTES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
REDOX POTENTIAL
SOIL CHEMISTRY
SOILS
SWINE
TOXICITY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
USA
VERTEBRATES
VIRGINIA
WASTES