Got 6 females in 5 gallon buckets under a 400 watt hps. They are 6 weeks into veg. In the past two weeks the bottom leaves on all the plants have started to turn from very healthy green to yellow and yellowish/green from the bottom leaves up. They are in organic soil, have been giving them organic nutes 2-0.5-1.5. One TSP per gallon. After the leaves started turning yellow I flushed, then watered using plain water for a week. They seemed to perk up but then got worse, I thought it might be a nitrogen deficiency so I started giving nutes again this time about 2-3 TSP per gallon. No good or bad responses.

So here are the pics, taken today. Wanting to start 12-12 light cycle soon, but not in the shape they are in, please lend me your expert advice.

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you said you were feeding them every watering?

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I started feeding them at about 3-4 weeks, one TSP of 2-0.5-1.5 per gallon every watering, then they started getting yellowish/green, so I flushed, then did not feed, just watered for the next 2-3 waterings over a week. They then got way way worse, as you can see in the pictures.

bumpity bump bump

why dont you wait another week.

i believe its a cal-mag or iron def. ready to get worse

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My 400W White Berry, GWS, White Rhino, & Trainwreck Closet Grow---First Indoor Grow*Cancelled*
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I dont think anyone here is not guilty of ever having yellow leaves. Plus it looks like the yellowing is only affecting your fan leaves.

The bottom fan leaves on my outdoor plants turned yellow once my plant reached 2.5 feet so I just removed them and they are doing fine. From what I've read when you see a unhealthy looking leaf you remove it.

Anyone know if it is possible to have nutrient lockout in soil? If it is then maybe you should adjust the PH of your water.

Good luck

What should I try to do in this case?

nutrient lockout can occur in any medium i believe

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My 400W White Berry, GWS, White Rhino, & Trainwreck Closet Grow---First Indoor Grow*Cancelled*
BBCheese & Heri-OG Kush*400w Closet Grow--- Second Op*

I had the same problem in the 4th week, but it was due to overwatering. I was doing it every other day. I waited 3 days, with no water, then it came they came right back within a day. I didn't have to start pruning for a 3 more weeks. How much are you watering?