SUBSTRATE REQUIREMENTS FOR PLANTS
Therefore, control of the primary products is necessary right from the start. For peat this means from the peat bog onwards, for pine litter in the forest, for composted bark at the composting plant, etc… Physical and chemical analysis should be carried out not only at the start of the preparation but also in the final stage when the substrate is delivered to the user.
A grower requires well prepared growing media which have constant properties the year round.
Therefore, standardized properties are required, thus allowing to mix the various primary materials at the desired proportion depending on the quality of the raw primary products.
This paper describes the different steps in order to make good growing media ensuring optimal plant growth.