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Inerts grow mediums

What is an inert substrate ?

The inert substrates are substrates that are decontaminated and that contain no bacteria nor microbes. What we call the modern culture (hydroponics) concerns the plants that grow in an inert and sterile substrate that are clay pellets, rockwool, coconut fibre and the Speed Grow. These different substrates have no nutritive elements and so, make the constant nutritive content necessary and evolving by means of water. We can only count on organo-mineral fertilisers to use hydroponic systems. These lasts can stay in a solution approximately 10 days.

The most inert supports used in domestic hydroponic systems:

The clay pellet constitutes the most simple and the most handy growing middle for people who make this kind of culture, whether they are novice or confirmed growers. Effectively, thanks to its ability to drain, to keep a little bit the nutritive elements and to offer a big oxygenation to the roots, the clay pellets accept the continuous or alternating ebb and flow.

The rockwool is also a widespread growing middle, especially for professional horticulturists; Most of the tomato growings (food-processing industry) are carried out with this substrate.

Well-known for its ability to hold water and the nutritive element, the irrigation with the rockwool has to be made with a lot of precautions by the cultivator considering the fact that it has to be programmed and homogeneously spaced during the plant lighting time in order to meet the needs of water and nutritive elements.

In practice, the informed grower will have to take into account the rockwool volume used, the weather conditions according to his growing space and the ability of the plants to assimilate their complements according their growth and bloom stages, to programme his tides and the time with the help of a digital, mechanical or cyclical timer.

Practical information !

In concrete terms, the more the plants evolve, the more they need water and fertilisers. However, tides that are too close to each other or too abundant could generate an oxygen rarefaction around the roots and a risk of moisture.

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