Light green then yellowing NEW growth

the other one

New Member
Hi All, great community of helpful folk here...first post. I'm hoping I can get some consensus on what my problem might be. The last few weeks of veg and now two weeks into flowering, my new growth is coming in light green on my sativas especially. Then the leaves sometimes yellow all the way. This is mainly affecting my LSD, and a Pandoras Box.

I'm growing in a soilless lightweight mixture Fafard 3B Mix
400W MH during veg, now HPS and supplementing with a 400W equiv flowering Blackstar LED.
pH 6.5 or a little higher as best as I can tell from soil test.
Temps around 90 when the lights are on. And about 70 when they're off. I think I have good ventilation outside otherwise.
During veg i was using only bat guano, and now General Organics BioThrive 2-4-4, plus Nitrozyme 0-4-4 right at the switch. Lately, full strength.

What's going on? Old growth remains green and healthy looking. And i'm also growing a Pineapple express indica in same space and that seems to be doing better.

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churchhaze

Well-Known Member
Maybe iron deficiency since you say it's a soilless potting mix. Maybe the new nutrients will fix things since you said you just changed it? It could be a number of things. It could be K too, and then the new nutrients would definitely fix it.
 
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