Fairfield Composting

Characteristics as a Growing Media

* Fairfield's compost is pH7

The bulk density of composted material is higher than that of, for example peat. However, once blended with peat or other substrates at typical rates of use such as 2:1 (diluent : composted material), the difference is reduced. Once thoroughly watered, such differences are often small.

The screen size specified is suitable for most growing media. Special end uses may require a different particle size range e.g. cell trays would require a finer grade in which `spears' have been eliminated by twin-screening.

Air-filled porosity (AFP) and water-holding capacity (WHC) of growing media are dependent on the proportion of particle sizes in the mix. Ideal AFP/WHC varies with cultivar, container size, irrigation system and other circumstances.

The composted material should be free-flowing in order to facilitate efficient blending, bagging and, eventually, filling of plant containers. Flow properties are a function not only of particle size and shape but also of moisture content.

Uses and Benefits as a growing media - overview