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2) the water flow - called current of sweating he is so essential for a vegetal life like the light. The capillaries of the raiz absorb water, nutrients and oxygen of the ground, transporting them from the trunk to the leaves. Part of the water is used for the photosynthesis, while another part gives back to the raiz sugars and starches produced by the plant.
The proportion of acidity and alkalinity of the water is moderate with the factor pH (1 is Maxima acidity, 14 Maxima alkalinity), that does not have to be inferior to 5.5 nor superior to 7 for plants that grow on earth, although those of hidropónico culture they render the more with a level 6-6,5. All good store of gardening sells digital measurers of pH, that are simplest to use; in his defect there are electronic measurers or, in the worse one of the cases, litmus paper with the instructions adapted for his use. The water of the faucet usually contains high chlorine levels, that will evaporate letting it rest a pair of days in some open container.
More serious it is the alkaline proportion of sulfur and salts, because the salt eliminates to any plant from certain concentration. Until it does relatively little, the cultivator had to resort to uncertain procedures to elevate or to diminish pH - like white vinegar, egg rinds pulverized or ash -, but today he is simple to buy liquid that make those two functions accurately and comfort. As they know well who have peceras, the excess of acidity is resolved with small amounts of sódico bicarbonate (old cure for the heartburn), and the defect with saltpeter.
In traditional agriculture one of the problems, specially in the case of small plants, it is too much irrigation, that rots the raiz and cuts the provision of I oxygenate towards the stems. Their symptoms are curly and yellowish leaves, flooded ground, fungi and slow development. But hidroponía outpost - done on means terrosos- it does not suppress that annoying possibility; any excess of water goes being drained, when slipping on materials like wool of stone or clay expanded, according to we will see. The opposite problem - the lack of sufficient irrigation is a millenarian plague for all type of farmers, that worsens based on some grounds, incapable to retain the humidity. But hidroponía is very economic, until the end of which a tank with twenty liters is enough to irrigate a square meter of land - during seven or ten days (depending as large as the plants) -, because that water is recycled continuously.
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