Dr. Russell Sharp of Hydroponics Daily exposes common and dangerous preservatives found in fertilizers and biostimulants, including formaldehyde, quaternary ammonium compounds (BAC50), copper sulfate, bronopol and silver.
He explains why growers should check product labels and safety data sheets, prefer food‑grade preservatives, and be aware of impacts on human health, plant uptake and beneficial microbes.
Practical tips include researching ingredient CAS/EC numbers, using reputable formulations, and choosing safer preservation strategies to protect crops and consumers.
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