PK1
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you know cal/mag NPK is 2-0-0 this means it only has Nitrogen. That is not a nitrogen deficiency. Don't add anything to your schedule and just go through a run of Mantis since you have the product.Definitely seems to be a Cal/Mag deficiency. The Mag deficiency was/is showing on a few plants and now a Calcium deficiency is showing up on the runt. The runt‘s medium dried more than the others so I wonder if that contributed to it.
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That's either a potassium or calcium deficiency i think, but i do get them wrong sometimes. How many line of products does Mantis sell?