I have a tent going with 5 plants between 48-50 days. ( 3 Dinafems and 2 Sweet Tooths). One Dinafem (Amnesia XXL) and one Sweet Tooth (Big Devil XL) are showing exactly the same coloration pattern that you are getting. And its been going on for a least a couple of weeks or more. The other strains are not showing the problem. I've been scratching my head on this one, and looking at lots of pictures to try to diagnosis. Some pics suggest a manganese deficiency, or maybe magnesium, others suggest a nitrogen deficiency. I'm not confident that its either, but don't have a good idea. Tomorrow I'm going to check soil pH just to make sure that its not out of the 6-7 range. Today I gave these two gals a hit of calmg and Biotabs Bio PK 5/8 mixed in along with their regular feed of Megacrop, Sweet Candy and Bub Explosion.
Thanks for the info Only- 2 of my 3 OA are a dark green(sodk also) but the one showing a lot of yellow is the largest + is filling out slower than the others, it is also nearer the light.. I think because it is the most vigorous of the 4 that maybe l dialled back the grow nutes too soon and it is lacking N(as you suggested)
Cheers for the info AG- to be fair lm not that concerned about the yellowing cos everything else seems fine,its just nearly all my plants start changing colour as they near the chop maybe this ones a bit different?dispite the lenght of time i been growing and my experience,i am the shittest at def/tox diagnosis game.its not N thats an gradual yellowing,calmag is normally lil spots.this is greening out between the viens and thats something else....but the what it is i cant remember.
live stoners is full of stoners but some quite smart stoners is a good place to start https://www.autoflower.org/threads/...y-june-july-2018.65428/page-1191#post-1829697
the infirmary section https://www.autoflower.org/forums/autoflower-infirmary-for-sick-plants.90/ some great stickies up top
the form for when things go bad https://www.autoflower.org/threads/...ill-out-first-with-the-data-that-matta.45991/ seems a bit of a pain but every detail really does count to getting a better diagnosis from some super talented peeps.
@ me if ya get stuck
good luck n keep er lit.
Copper def from incorrect ph or " yellow leaf spot " from over watering maybe?
Thanks for the suggestion. I got excited when I read your diagnosis --- 'cause the pictures of copper def looking VERY similar to mine. But alas, I checked soil pH at multiple spots this morning. One plant is at 6.8 average pH and the other at about 6.9. This is on the high end, but not outside the correct zone, as I understand it.
