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Brown edges, burned tips (new leaves too) and dots on the leaves

1203u1894yrt123g
1203u1894yrt123gstarted grow question 4 years ago
My Grapefruit and Skywalker in coconut substrat have brown leave’s edges, yellowed and also have some brown dots. I thought it is nutrient burn but now i think it is Potassium deficiency. I didn’t manage pH level so well last week (6.5 for coco - too high?) What do you think?
Solved
Week 7
Leaves. Edges burnt
Leaves. Tips - Burnt
Leaves. Curl up
like
smoke24
smoke24answered grow question 4 years ago
6.5 is the upper cut off for coco. You want to be between 5.5 and 6.5 How close is your light, because the curling of the serrations and yellowing could definitely be light/heat stress. Wouldn't hurt to try backing the light off 6-8 inches and see if that helps. Happy growing!
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