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One starts to die

Theeyebt

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Hi to all any ideea what is hapenning with one of my plants they are in week 7 and the tips started to turn yellow quickly soil ph 5.0 =5.5 now im using madame grow bazooka bloom 2.5 ml 1L/whater and jamaican bloom 3ml/1L whater i have one white widow the other girlsscout cookis but only the w.w have this problem the other look like now the top of the buds starts to get yellow but just a little bit

any ideea

by the way im using coco soil (i have add unthil now calmag 1ml/1L)
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stinkyattic

her dankness
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First I'll start with... congratulations! Your plants actually look really good that close to harvest!
Those poke meters aren't the most reliable thing ever but even for coco you're a bit low.
At this point you're in this stage where they shouldn't be getting much if any food, and definitely no nitrogen. Only one plant doing it may be the one that is drinking the slowest and staying damp the longest, which will make sour soil problems more apparent.
I'd simply switch to plain water with maybe a half strength calmag, adjust nute pH to 7 to offset the soil drop, and finish out like that.
Really, you've done a lovely job in an often mystifying medium, and should be enjoying a nice harvest shortly!
Edit: just on that one plant. The others obviously have more time left.
 
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