Determination and mitigation of ammonia loss from urea applied to winter wheat with N-(n-butyl) thiophosphorictriamide

作者：Turner D A; Edis R B; Chen D^*; Freney J R; Denmead O T; Christie R

来源：Agriculture Ecosystems & Environment, 2010, 137(3-4): 261-266.

DOI：10.1016/j.agee.2010.02.011

• Agrotain
• Urease inhibitor
• Mass balance
• Backward Lagrangian stochastic model
• Ammonia volatilization

This study conducted in the Wimmera, a major cropping area in western Victoria Australia, evaluated a backward Lagrangian stochastic (bLs) dispersion model for measuring ammonia (NH(3)) loss and compared NH(3) losses from a wheat crop after top-dressing with urea or "Green Urea". Green Urea contained 45.8% nitrogen (N) as urea and "Agrotain" (N-(n-butyl) thiophosphorictriamide) @ 5.0 L/t. The two products (80 kg N ha(-1)) were applied to circular plots of 25 in radius and losses were determined for a period of 23 days using mass balance micrometeorological methods. When the NH(3) concentration in the air at the stability independent height, 0.8 m above the crop, was used there was a strong relationship between the vertical flux density of NH(3) as determined by the full profile method and that determined by the bLs method (r=0.86). Rates of ammonia loss from the urea treatment ranged from 0.2 to 2.1 mu g N m(-2) s(-1), while those from the Green Urea treatment never exceeded 0.35 mu g N m(-2) s(-1). Cumulative NH(3) losses for the urea and Green Urea treatments were 7.6 kg N ha(-1) (9.5% of applied N) and 0.8 kg N ha(-1) (1.0% of applied N), respectively. The results indicate that use of Green Urea instead of regular urea in Victorian wheat growing could substantially reduce NH(3) emission.

• 出版日期2010-5-15
• 单位CSIRO