Ammonia Loss from Applications of Urea‐Ammonium Nitrate Solution to Straw Residue
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The increased use of urea and urea-based N fertilizers along with an increase in crops under no- or reduced-tillage practices may require changes in fertilizer management practices. Surface application of urea-based fertilizer risks the loss of some N by volatilization of NH//3. Our objectives were to assess the loss of NH//3 and to simultaneously observe the associated N transformation and movements in the field following broadcast applicaton of urea-ammonium nitrate solution at a rate of 200 kg N ha** minus **1 to soil with wheat (Triticum aestivum L. ) straw residue cover. Also, we wanted to characterize the factors associated with the residue that might affect loss. A micrometeorological mass-balance method was used to measure NH//3 loss during two sequential field studies with different amounts of precipitation and irrigation. Volatilization losses showed diurnal patterns coinciding with fluctuations in residue temperature, residue water content, and wind speed.
author list (cited authors)
McInnes, K. J., Ferguson, R. B., Kissel, D. E., & Kanemasu, E. T.