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Does this look like mag dif with a bit of N burn?
5 1/2 weeks into flower
5 1/2 weeks into flower
Hank-- Is it happening only on the upper leaves?..looks like it, and that means most likely an immobile nutrient defc.,... these symptoms, the yellowing margins, and some interveinal, no spots/dead patches (yet) fit early Zn defc., a micronutrient; the rest of the plant looks nice, so off-pH lockout seems less likely than plain old lack-of type defc.; check the pH anyway, and get yourself some sort of micronutrient supplement....