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Title: EFFECT OF NITROGEN FERTILIZER EFFICIENCY ON SOIL CHEMICAL PROPERTIES

Author
item SEGURA, AVILA - UNIV OF WI MADISON WI
item BARAK, PHILIP - UNIV OF WI MADISON WI
item Laird, David

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/31/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Long-term fertility plots at Arlington, WI, show that acidification and nitrate losses associated with nitrogen fertilizer inefficiency significantly alter soil properties. Acidification has increased Mn availability to the point of toxicity in corn. Not only does CEC measured by sum of exchangeable base cations and exchangeable acidity decline with prolonged acidification, but CEC measured at fixed pH, with either Na or Ba as index cations, decreases. This may indicate permanent changes in soil exchange properties beyond simple pH-change dependency. Analysis of soil clay also shows evidence of chemical alterations as a result of 30 yr of nitrogen fertilizer use. The effects of acidification seem to be more closely associated with quantity of N lost, particularly due to nitrate leaching, than N added.