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Potassium deficiency?

LetsGrowSome
LetsGrowSomestarted grow question 9 days ago
Bottom feed with wicking pot base and 5 gallon fabric pot. 1.5 inch perlite in bottom, layer .5 in of earthworm castings, 2.5 Tbsp Osmocote 15-9-12, 2 Tbsp domolite lime, 2 Tbsp gypsum. Even topsoil,cow compost,perlite mix. Same fert mix on top . 750ppm 6.4ph from Slurry test
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yan402
yan402answered grow question 9 days ago
Hey growmie, this is mostly Potassium deficiency, burnt leaf edges, yellowing from the outside in, typical K sign. Looks like some Magnesium deficiency creeping in as well, interveinal yellowing on lower leaves. With slow-release ferts and bottomfeed setups it’s pretty common for Potassium and Magnesium to run low in mid to late flower, especially if the plant is drinking faster than the media can release. pH and slurry test seem okay, but I’d probably give a balanced feed with extra K and Mg or a light flush depending on runoff numbers. She looks like she’ll finish alright, not a disaster in any way 🤞🍀❤️
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