Do you know how rock wool slabs work? UPuper rock wool grow slab can replace soil as a greenhouse planting substrate, which is cleaner than soil and has higher yields. The water absorption rate of grow slab can reach 800%. Before planting, the rock wool slabs are irrigated with water. The rock wool fibres fully absorb water and have water retention, which will provide adequate water to plants during growth. Rock wool fibre is conducive to the rooting of plant roots, and at the same time, the large volume can make the root system quickly cover the entire grow slab. Tomatoes grow better and yield higher yields.
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