Liquid Manure - is spread both by tanker and irrigation systems. Liquid manure variation is often determined by wind speed and direction. It is also influenced by consistency of the manure. Seemingly random fluctuations are often due to changes in manure thickness. These are difficult to adjust for.
Irrigation systems cover a large area in relatively little time.
This system also creates the most problems in un-uniform application. One example changed the application rate by 60 percent when going from 5 mph to 2 mph. This is caused by friction and construction as manure flows through a rolled up hose. There is also an increase in speed as the drum rolls up. A compensator can change the motor speed so that it is constant during the entire pull.