When compost is done and ready for use, it has a pH of between 6-8. As it decays, the compost pH changes, meaning that at any point in the process the range will vary. The majority of plants thrive in a neutral pH of around 7, but some like it more acidic or alkaline.

Is composted cow manure acidic or alkaline?

Cattle manure tends toward a neutral pH. Studies by Penn State showed dairy manure at 7.0, while manure mixtures from the University of Ngaoundere ranged from approximately 5.9 to 6.9.

What is the pH of composted horse manure?

The composted horse manure, including barn sweepings, was highly alkaline (pH 8.4) because hydrated lime, sprinkled on the floor of the stables to control odor, was mixed into the material (table 1). The application of lime to horse stalls is common practice.

Composting manure eliminates the possibility of burning the plants. Another option is to till it into the soil prior to spring planting, such as during fall or winter. Generally, fall is the best time to use manure in the garden.