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5) the plants have grown during millenia on earth and other organic bases as it disturbs or serrín, until inorganic means like pearlite or vermiculita were invented (mica volcanic glass and, respectively, treated to high temperatures), pumice stone crushed or expanded clay, because if such means are complemented with a rich irrigation in nutrients the roots will have the suitable drainage, preparing themselves fungi and asphyxia. Those and other bases can be acquired in any store of jar dinería, combined already with the installment that each manufacturer considers better. It agrees to remember that these vehicles of growth must be washed with water before being used.
Nevertheless, the present revolution is based on which the old hawaianos called "hair of Pele" (a volcanic deity), because the strong tropical winds break off fine fibers of liquid magma, interlacing them soon like a packing species, and for centuries the criadores of orquídeas and other plants very difficult to cultivate they have been using this base. But the use of this rock wool (rockwool) in conservatories and gardening of intenor only became general in Denmark towards 1969, when the agriculturists decided to draw for with talent a prohibition imposed by the EC to that the country cultivated forage on vegetal earth. Today good part of the European hidropónica gardening uses exclusively this means, that have also extended of spectacular way in the United States, Canada and Japan. Holland, for example, has 4,000 hectares of conservatories, that in their totality practically use rockwool.
The advantages begin by the price, compared with those of crowd or mantillo. Rockwool from almost any type can become of fused rock, although the best one is obtained from volcanic basalts, suppressing the waterproof mineral oils that contain. The most well-known mark is Danish, but there are Japanese, English, French, Dutch, Finnish, North American and even Australian and Korean varieties. The fundamental thing is that it is inert means, sterile, porous and nondegradeable, which it provides a magnificent support for the raiz and also acts like temporary deposit of nutrients, without forming dry nor encharcadas bags. Even saturated of liquid, rockwool maintains 20 % of oxigenación, thanks to the great percentage of air that fits between its fibers. According to it seems, nor most perfect of natural grounds, with the best one of the installments, can equal the yield of this means botánico².
PH of rockwool goes up to around 7.8, which advises to lower pH of the tank to 5.5 to less maintain the solution to to 6.5 or something. Although it retains between 10 and 14 times more water than any earth, that does not avoid an accumulation of salts; for that reason he is advisable to renew the tank of nutrients every week, and to even flood the first plants with single water or a very tenuous dilution (by means of a dripping of twelve or fifteen minutes, or spilling something like half liter on each foot), to sweep possible deposits of salt in each raiz. Extraordinary humidity of this average does that their surfaces exposed to the light fill of green seaweed (if they are healthy) or black (when they are disturbed), avoidable thing covering those parts with white plastic; the seaweed does not compete with the cultivated thing as far as nutrients, and they could only harm the harvest in case of rotting massively, due to bacteria and virus. For that case - little habitual there are chemical algicidas, that will be opportune to use very restrictively if the garden cultivates vegetables destined to feeding.
Unnecessary it seems to add that rockwool - as the expanded clay and other nonorganic grounds work worse than earth for tubercles, radishes, asparagus or grapes, for example. The most habitual harvests of this means are tomatos, cucumbers, peppers, melons, lettuces, strawberries, marijuana, orquídeas, roses and other many flowers.
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