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

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Turner, D.A.; Edis, R.B.; Chen, D.; Freney, J.R.; Denmead, O.T.; Christie, R.


2010


Journal Article


Agriculture, Ecosystems & Environment


137


no. 3-4


261-266


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 (NH3) loss and compared NH3 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) @ 5.0L/t. The two products (80kgNha-1) were applied to circular plots of 25m radius and losses were determined for a period of 23 days using mass balance micrometeorological methods. When the NH3 concentration in the air at the stability independent height, 0.8m above the crop, was used there was a strong relationship between the vertical flux density of NH3 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 2.1µgNm-2s-1, while those from the Green Urea treatment never exceeded 0.35µgNm-2s-1. Cumulative NH3 losses for the urea and Green Urea treatments were 7.6kgNha-1 (9.5% of applied N) and 0.8kgNha-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 NH3 emission. Reprint permission, Elsevier Science, Copyright 2010.


CSIRO Land and Water


https://doi.org/10.1016/j.agee.2010.02.011


English


changeme:428


Turner, D.A.; Edis, R.B.; Chen, D.; Freney, J.R.; Denmead, O.T.; Christie, R. Determination and mitigation of ammonia loss from urea applied to winter wheat with N-(n-butyl) thiophosphorictriamide. Agriculture, Ecosystems & Environment. 2010; 137(no. 3-4):261-266. https://doi.org/10.1016/j.agee.2010.02.011



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