The 20-40 samples from which the final sample is to be compiled must be collected in a clean bag. Clods must be crushed, foreign matter removed, and the soil must be mixed thoroughly. After spreading the soil in a thin layer, small scoops are taken evenly over the whole depth and area and placed in a clear plastic bag or carton. The final sample, representative of a homogeneous unit, must have a mass of 0,5-1,0 kg. It is important to be able to provide additional information about the properties of the soil, climate, production and fertilisation history, since recommendations cannot be based on soil analysis alone.
Nurseries find it cheaper to supply seedlings in containers other than seed trays.
Dip the trays in a solution of agricultural disinfectant and styroseal to make sure they are free from bacteria, viruses and fungi, and to prevent the roots of the seedlings from penetrating the sides of the seed tray. Water the medium to dampen it slightly. This facilitates wetting after the seeds have been sown. Overfill the tray with growth medium. Scrape off excess so that the medium is level with the top of the tray.