Why is a water buffer important in the cultivation system?
In the first instance, the water buffer must be able to cushion a temporary disturbance in the nutrient unit. A substrate with a lower “capillary action capacity” is more susceptible to drying out. In addition, the shocks in EC, pH and temperature in a substrate with good capillary action and with a water buffer are less extreme. Savings in terms of water and nutrients thanks to the controllability of stone wool substrate are of course also important if recirculation is to be applied. With a water buffer, there are far fewer cubic meters of water to be disinfected, so the disinfection costs per square metre are lower.
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