Spreading to save nutrients

One way of increasing the value of slurry and manure is to reduce the losses of nutrients that occur due to the method of spreading.

Spreading with 'jetters' or machines with upward facing splash-plates to produce an upward fan of slurry can result in uneven distribution, high losses of ammonia and high levels of odour.

Spreading slurries by low emission methods, such as band spreading with multiple trailing hoses, can reduce nutrient losses and improve nitrogen efficiency. Field trials at six grassland sites in Ireland showed that the efficiency of ammonium nitrogen recovery by grass was 37 percent for cattle slurry spread by splash-plate and 59 percent for the same slurry when band spread with a trailing hose machine.

Fitting a band spreader with a trailing shoe to each trailing hose enables slurry to be spread on the soil surface below the grass sward. Not only does this reduce sward contamination, but the grass also acts as a filter for ammonia, resulting in even better recovery of nitrogen.

Remember, when spreading slurry, one way of increasing its nutrient value is to fit a band spreader with a trailing shoe. By reducing nutrient losses you can reduce the need for the additional application of chemical fertilisers, and have a positive impact on the environment.

For information on slurry spreading methods contact Countryside Management staff at your local DARD office.