3) Can greenhouse soil comply with these requirements for an ideal substrate?
Fresh or ‘virgin’ greenhouse soil (soil that has never previously been used for cultivation) may be free of disease and possess a reasonable structure. In addition, depending on the kind of soil, it can also be fairly steerable. However, the soil in any greenhouse will always have wetter and drier patches.
Moreover, during the cultivation of the crop, the soil may become infected with one or more soil diseases – and, furthermore, the structure may also deteriorate. Consequently, it is difficult, if not impossible, for greenhouse soil to comply with all the requirements for an ideal substrate.
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