At the Greenway tomato nursery in De Lier, the Netherlands, each slab doesn’t have just one slit but two: one for each plant. A simple extra cut at the bottom of the rockwool slab ensures a more even EC and more uniform distribution of the nutrients in the slab. Erik Volkering, the nursery’s cultivation manager, has been doing it this way for five years and is very happy with the results. A seminar earlier this year was devoted to this subject, as this method is by no means standard.
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