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- Arnold, S.L.; Parkin, T.B.; Doran, J.W.; Eghball, B.; Mosier, A.R.
- Communications in soil science and plant analysis 2001 v.32 no.17/18 pp. 2795
- methane; nitrous oxide; sampling; laboratory equipment; automation; computer software; computer analysis; agricultural soils; soil microorganisms; emissions
- ... Analyzing the flux of CH4 and N2O from soil is labor intensive when conventional hand injection techniques are utilized in gas chromatography. An automated gas sampling system was designed and assembled from a prototype developed at the National Soil Tilth Laboratory in Ames, IA. The sampler was evaluated for accuracy and precision when attached to a Varian 3700 gas chromatograph configured with f ...
- Sistani, K.R.; Miles, D.M.; Rowe, D.E.; Brink, G.E.; McGowen, S.L.
- Communications in soil science and plant analysis 2001 v.32 no.17/18 pp. 2783
- poultry manure; phosphorus; nutrient content; freeze drying; drying; chromatography; colorimetry; chickens; nutrient intake; air drying; ion exchange chromatography
- ... Areas of intensive poultry production are prone to high phosphorus (P) losses due to excessive manure application. Historically, manure application rate has been calculated based on nitrogen (N) needs of the crops and N content of the manure with no attention to the quantity of phosphorus (P) loading. In many instances, a gradual buildup of P in soil has resulted from long-term manure application. ...