Foliar KH₂PO₄ spraysinduce systemic resistance (ISR) that suppresses powdery mildew in apples, cucumbers, barley and tomatoes without traditional fungicides, making it a go-to for organic IPM. Compatible with all water-soluble fertilisersexcept Ca²⁺/Mg²⁺ concentrates, MKP is a cornerstone “B-tank” salt in hydroponic two-part systems.
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