Examining substrate cost versus true propagation expenses
Source: VFD.com
Rockwool has consistently been one of the preferred options for producing uniform, high-quality transplants, particularly Grodan rockwool. Because of customer demand for more economical alternatives in Mexico, she decided to test a lower-cost substrate for propagation.
But once the substrate was tested under controlled conditions, the results proved far more frustrating than expected. The cheapest propagation substrate is not necessarily the lowest-cost option.
If a substrate compromises germination, root development, uniformity, or transplant quality, the additional cost shows up later through labor, crop variability, delayed establishment, and potentially reduced yield. Its physical structure, water/air balance, uniformity, and consistency provide a much more predictable environment for seedling establishment and root development.
Why this matters: For operators, this is a water-management story. The useful signal is that direct substrate measurements can help cut drain loss materially without giving up yield or fruit quality, which is exactly the kind of controllable efficiency gain a facility can build on.
Frequently Asked Questions
Why does substrate sensing matter in free-drain strawberry systems?
Because drain percentage tells a grower what already happened, while substrate moisture and EC data show root-zone conditions directly. That makes it easier to cut water loss without guessing.
What is the operator takeaway from this trial?
If the thresholds are understood well enough, growers can reduce drain water materially while protecting yield and fruit quality, which makes sensing an operational tool instead of a reporting tool.
