What do growers gain from the “controllability of the substrate”?
With a controllable substrate, the crop has access to whatever it needs at that moment. The plant will therefore respond optimally and thus also be more productive. With Grodan stone wool substrate, the slab volume can be controlled right down to every little corner of the slab volume. Comparable results may be possible with other substrates, but would require around 10 to 15% more water and nutrients.
