Boron defiency overnight?

[omnious]

This is a photoperiod, been over month in that bucket in coco. Normal veg feed. Last night I watered autoflower and poured the rest to this plant about 12 hours ago. Only difference to what it is used to; 1,5L bottle where nutes were mixed instead of 1L, so bit milder, and I left light (marshydro reflector 96) on instead of 18/6. The autoflower is all green.

 

[Waira]

- looks like Fe defc., possibly Zn, but I don't think it's B defc.,... How are you running the coco, drain to waste? What % run-off each time.... what pH and ppm going in, and as run-off?
Water source? ... this isn't related to the feeding as described; you need to get the in-pot pH checked to make sure it's in range, and we can eliminate lockout as a cause,... otherwise it's likely a simple lack-of... best, fastest way to treat short term is foliar spray with a dedicated micronute supplement, something like Earth Juice Microblast... then add that into the feeds

 

[omnious]

Unfortunately I've lost my ph tester But I remember feed being 6, in hard tap water, with GH CocoTek A+B (3ml grow 1,5ml bloom / 1L veg phase). Run off no recollection. There is no hydroton reservoir, just coco, so I pour as they drink. Works fine with Kalichakra being in bloom, a hungry one. This one mostly Master Kush btw. A root bound crossed my mind as well... Been in 5 L forever.

Yes, the spray! I've used it to 2 week olds (symptoms looked bit different then) with success. There hasn't been need for older ones so far. If that doesn't help then it must be lock out.