|Avila-Segura, M - UNIVERSITY OF WISCONSIN|
|Barak, P - UNIVERSITY OF WISCONSIN|
|Posner, J - UNIVERSITY OF WISCONSIN|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: November 4, 1999
Publication Date: N/A
Technical Abstract: Excess nitrogen inputs produce soil acidification as a result of coupling of nitrogen and proton biogeochemical cycles and increased nitrate leaching causes increased cation leaching. Crops interact with soils by extracting cations and anions, excreting acidity or alkalinity, and storing alkalinity as organic anions. The Wisconsin Integrated Cropping Systems Trial at Arlington (WI) Research Station has sampled soils and plants under standard rotations and nutrient inputs starting in 1989. Archived samples from this trial are being used to study the coupling of nitrogen and proton cycles under real farm conditions and to evaluate acidification and alteration of soil chemical properties in common agroecosystems. Leaching of cation, potential acidification due to excessive nitrogen inputs, and crop-induced acidification are under evaluation as indicators of how agriculture impacts long term soil quality.