Reacidification of two lime amended soils in western Oregon

Conference · · Soil Sci. Soc. Am. J.; (United States)

OSTI ID:6293883

Doerge, T A; Gardner, E H

Leaching of basic cations by winter rainfall and irrigation water and the increasing use of NH4 -fertilizers have resulted in widespread soil acidity in western Oregon. Lime applications ranging from 0 to 14,650 kg ha were made on a Nekia sicl (Xeric Haplohumults, initial pH 5.0) and from 0 to 11,200 kg ha on a Woodburn sil (Aquultic Argixerolls, pH 5.3) in the Willamette Valley of western Oregon in 1971 to 72. Monitoring of soil pH and levels of extractable basic cations applied in the liming materials for 11 to 12 yr permitted estimation of the rate of acidification of soils receiving different amounts of lime. Soil acidification rates increased with increasing quantities of lime initially applied. Faster reacidification of soils amended with higher lime rates is explained by the pH dependence of acidifying processes such as nitrification, CO2 release via plant and microbial respiration, mineralization of organic matter and dissociation of organic acids in soil solution. CaS release from mineral weathering appeared to have an important effect on soil pH and extractable CaS , particularly in the absence of large inputs of acidifying materials such as NH4 -fertilizers.

• Research Organization: Oregon State Univ., Corvallis
• OSTI ID: 6293883
• Conference Information: Journal Name: Soil Sci. Soc. Am. J.; (United States) Journal Volume: 49:3
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACIDIFICATION
ALKALINE EARTH METALS
CALCIUM
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DISSOLUTION
ELEMENTS
ENVIRONMENTAL EFFECTS
FEDERAL REGION X
LEACHING
LIMING
METALS
MICROORGANISMS
MINERALIZATION
NITRIFICATION
NORTH AMERICA
OREGON
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC MATTER
OXIDES
OXYGEN COMPOUNDS
PH VALUE
RESPIRATION
RESPONSE MODIFYING FACTORS
SEPARATION PROCESSES
SOILS
USA