Light
Roots don’t like light at all. Micro-organisms that live in the root-zone also don’t like light. Organic substrates have a natural dark colour, so the root-zone is also dark. Inert substrates are often packed in plastic material, which does not let through the light.
pH
Fluctuations of pH influence the composition of micro-organisms. The more stable the value of the pH (5.5 – 5,8), the more stabled the microbiologic balance will be.
Bio-means
Biologic, bio mineral, organic means and means on the base of plant-extracts all influence micro-organisms. The newest means in gardening are bio-stimulators. The bio-stimulator influence directly the micro-flora. So can the bio-stimulators directly restrain influences of the disease-producing micro-organisms, so the good organisms can develop better.
Chemical insecticides
These synthetic means kill more than only mite or white fly. If the residue of the insecticides drips from the leaves into the root-zone, they also kill the positive micro-life. Also these means are not recommended because of the damage they can do to your health.
Oxygen
The type of substrate, how thick the layer of the system is and how often the plants get nutrition influence the amount of oxygen in the root-zone. If there is a lot of oxygen, other micro-organisms will develop then when there is a lack of oxygen.
Root-exudates
Besides the enumerated factors which can influence the grower, there are processes in the root-zone, which are influenced by the plant itself. These are the so-called root-exudates. These separation-products can consist sugars, amino acids, phenols, phenol-acids or other organic combinations. Sugars and amino acids can serve as nutrition for the plant, so they can play a grow-stimulating role. Phenol-combinations and certain organic acids can restrain the growth of the plant if the strength is too high. Also bio-stimulators can be a part of it. Bio-stimulators can break down all kind of organic combination so the plant can absorb it.
That is why I advise the serious grower to check the micro-climate of his plants… it can make a lot of difference…
Root-temperature
The presence of a micro-organism and the quantity of it, depends on the temperature in the root-zone. Every micro-organism has its own optimum.
EC (solved salt-concentration)
The complete salt-concentration is important for the fact that the micro-organisms can survive. The separate nutrition-elements can influence the growth of certain micro-organisms.
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