|Roager Jr, Noel|
|DOUGLAS, JR, CLYDE|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/1/2001
Publication Date: N/A
Technical Abstract: The level of nitrogen carbon and phosphorus released from decomposing manure may influence soil quality and crop yield. Or objective was to determine rates of nitrogen and phosphorus mineralization following the addition of beef manure to silt-loam soils common to the dryland cereal producing areas of the Pacific Northwest. Samples were collected from the 0-20 cm soil one and incubated in glass bottles with and without manure additions, at 25C and two water contents for up to 52 days. Long-term crop management changed soil properties and influenced N mineralization. Inorganic N fertilization increased soil organic N slightly and decreased soil pH while manure amendments increased organic N, pH and mineralization. Increases in organic matter content achieved by manure amendments tend to increase the percentage of N in easily-decomposable fractions suggesting that the N made available for crops comes from previously-applied N that is being recovered over time.