The most common use of cow manure is plant fertilization. Cow manure has a nitrogen content of .25 percent, a phosphoric acid content of .15 percent and potash content of .25.
These nutrient contents are lower than chicken, rabbit, sheep and horse manure, which allows cow manure to be used more liberally and safely. With that said, too much can be toxic and contaminate groundwater. Because of this, dairy farms are required to come up with a Nutrient Management Plan. Some farms use anaerobic digesters to produce energy. Others mix it with water to create a slurry that can easily be dispersed among crops. Farms will sometimes store their excess manure in a pond until it is needed when it can be pumped out.