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Title: FERTILIZER APPLICATION: NH3 OPENER LOSSES AND UNIFORMITY ISSUES

Author
item HANNA, H MARK - IA STATE UNIVERSITY
item BOYD, P - US ARMY CORP OF ENG
item BAKER, J - ISU RETIRED
item Colvin, Thomas

Submitted to: Integrated Crop Management Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 12/2/2004
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Anhydrous ammonia (NH3) is injected below the soil surface during application to limit loss to the atmosphere. Application at a shallower depth may reduce tractor horsepower or allow greater speed which could increase field capacity of equipment if NH3 losses are held to acceptable levels. Losses of NH3 during, and for one hour after, field application were measured from a typical knife injector treatment operated at a 15-cm (6-in.) depth and 8 km/h (5 mi/h) travel speed and from a single-disc injector operated at shallower depth (5 and 10 cm (2 and 4 in.)) and a range of travel speeds (8,12, and 16 km/h (5, 7.5, and 10 mi/h)). NH3 losses during application as measured with a hood over the single-disc injector were 3-7% in clay loam, silty clay loam, and loam soils and 21 to 52% in a coarser-textured, fine sandy loam soil. Applying with a knife injector at deeper depth resulted in losses of 1 to 2% across all soil types. NH3 losses measured during an hour after application with stationary collection over the injection trench were 1% or less for all treatments. Losses during application were 5 to 55 times greater than during the first hour after application.