Reduction of ammonia emission by shallow slurry injection: injection efficiency and additional energy demand.

Ammonia (NH3) emission from livestock production causes undesirable environmental effects and a loss of plant-available nitrogen. Much atmospheric NH3 is lost from livestock manure applied in the field. The NH3 emission may be reduced by slurry injection, but slurry injection in general, and especially on grassland, increases the energy demand and places heavy demands on the slurry injection techniques used. The reduction in NH3 emission, injection efficiency, and energy demand of six different shallow slurry-injection techniques was examined. The NH3 emission from cattle slurry applied to grassland was reduced by all the injectors tested in the study, but there were major differences in the NH3 reduction potential of the different types of injectors. Compared with the trailing hose spreading technique, the NH3 loss was reduced by 75% when cattle slurry was injected using the most efficient slurry injection technique, and by 20% when incorporated by the least efficient injection technique. The reduction in NH3 emission was correlated with injection depth and the volume of the slot created. The additional energy demand for reducing ammonia emissions by slurry injection was approximately 13 000 kJ ha(-1) for a 20% reduction and 34 000 kJ ha(-1) for a 75% reduction. The additional energy demand corresponds to additional emissions of, respectively, 5.6 and 14.5 kg CO2 per ha injected.

[1]  B. F. Pain,et al.  Reduction of ammonia emission by slurry application techniques. , 2000 .

[2]  G. Malzer,et al.  Dynamics of Ammonia Volatilization from Turkey Manure and Urea Applied to Soil , 1994 .

[3]  R. Leuning,et al.  A sampler for measuring atmospheric ammonia flux , 1985 .

[4]  H. Marschner,et al.  Estimation of ammonia losses after application of liquid cattle manure on grassland , 1997 .

[5]  Rodney B. Thompson,et al.  Fate of nitrogen in cattle slurry following surface application or injection to grassland , 1987 .

[6]  G. W. Thurtell,et al.  Estimation of the rate of gaseous mass transfer from a surface source plot to the atmosphere , 1982 .

[7]  Jan K. Schjørring,et al.  Ammonia Volatilization from Pig Slurry Applied with Trail Hoses or Broadspread to Winter Wheat: Effects of Crop Developmental Stage, Microclimate, and Leaf Ammonia Absorption , 1997 .

[8]  J. Freney,et al.  Evaluation of a sampler for assessing ammonia losses from fertilized fields , 1989, Fertilizer research.

[9]  J. Huijsmans,et al.  Ammonia volatilization from nitric-acid-treated cattle slurry surface applied to grassland , 1994 .

[10]  J.F.M. Huijsmans,et al.  Draught Requirement of Trailing-foot and Shallow Injection Equipment for Applying Slurry to Grassland , 1998 .

[11]  Nicholas J. Hutchings,et al.  A detailed ammonia emission inventory for Denmark , 2001 .

[12]  B. F. Pain,et al.  Surface application and shallow injection of cattle slurry on grassland: nitrogen losses, herbage yields and nitrogen recoveries , 1996 .

[13]  S. G. Sommer,et al.  Effects of application technique and anaerobic digestion on gaseous nitrogen loss from animal slurry applied to ryegrass (Lolium perenne) , 1996, The Journal of Agricultural Science.

[14]  G. W. Thurtell,et al.  Verification of a simple micrometeorological method for estimating the rate of gaseous mass transfer from the ground to the atmosphere , 1983 .