My plant is yellowing more every day why?

I posted yesterday, thinking I had a good solution but it has only become worse. I’m growing aurora with cfl’s in coco, using GH flora trio and a cal mag supplement. For the first 8 days I did a every other day nute schedule then I stopped because I noticed some yellowing. Someone suggested to stop the nutes and use only calmag water until signs of improvement. It’s day 11, the plant is growing larger, and other than the yellowing at the tips is doing great. The only thing these past 3 days have corrected is my stem. My stem went from purple to green so that’s good. It still doesn’t explain the slight yellowing. It can’t be a cal or mg deficiency either the plants been getting that. Maybe I should restart the nutes? What do you guys think?

i'd be feeding that lightly. start at 1/4 of what your nutes call for and work up from there as the plant grows. and add a small amount of cal mag to each feeding, at least until the third or fourth week of flower.
looks good, otherwise

Hey bro. 1st post of my life. I run coco drain to waste in air pruning pots. I gotta say to take the calmag with a grain of salt. Ive found whenever ive had the same looking symptoms i narrowed it down to calcium overdose. I would check your run off ec and ph. Coco really seems to "charge up" with calcium and each time you water the plant the coco releases a good amount of excess calcium. In turn calcium raises the ph in the medium creating a lockout. Id say if your ph is high in your run off thats what ya got. Just flush with plain ph adjusted water for a couple feeds and it should fix itself. Good luck man and peace to you from Australia. P.S I stopped using calmag in coco and have never looked back.

Littlebirdie said:

Someone suggested to stop the nutes and use only calmag water until signs of improvement.

Click to expand...

Don't listen to that person again. She's hungry. 1ml of each, flush it good. I don't even use CalMag... running botanicare cns17 with a DTW setup.

This morning I checked, and conditions are worse. This plant is not cooperating! I’m not sure what I’m doing wrong. I have done everything I can

i'd say repot it into a bigger pot, and up the feed a little. drop the cal mag down to half strength. it really just looks hungry to me, and it's in a solo cup still.

I think you are absolutely right about the feeding. I think she is super hungry. I have only fed her 1/4 nutes showing slight improvement, but I think she wants about half right now. This coco is hard to get used to but even with feeding every day I believe a lot of nutes gets flushed along with the new nutes I’m just going to feed everyday and maybe do a big flush later on in veg.

How are you pH'ing what you're feeding it?

And what do you pH it to?

yeah, coco likes it to go in around 6.1, if you're way off from that, could be causing problems.

Ph’d to 5.8 since the start. The runoff will not go below 7. I tried to flush it. GH nutes flora trio with calmag as well.

I was once having big problems, where id feed at 5.5. Ph would come down to about 5.8 after a good flush with nutes. Overnight ph would spike to over 7. I stopped using calmag, problem went away. Its the same reason people like to use lime etc in coco to use as a buffer, because it braks down so slowly, you can flush the excess out, and still have a healthy amount of calcium in the media. But in all honest i think if you bare the rule in mind, you dont need to buffer your coco, if youre running dtw with good runoff.
It also screams calcium lockout to me by the symptoms in the post. Magnesium becomes quite unavailable around 6ph and below. Calcium is a main antagonist for nitrogen and becomes quite unavailable at high a ph. It makes sense if your purple stems have gone away because of the mag. Which in turn leads me to think lockout is you problem, because by the sounds of it your ph is high. Think you will find the calcium has sweetened your media. Take it easy

Littlebirdie said:

Ph’d to 5.8 since the start. The runoff will not go below 7. I tried to flush it. GH nutes flora trio with calmag as well.

Click to expand...

BINGO!!!!!!

Just give it plain ph adjusted tap water bro. Itll be fine

Tim1987 said:

Just give it plain ph adjusted tap water bro. Itll be fine

Click to expand...

And once it sorts itself out, Cut the dose of nutes.

I’ll post a pic tonight of the plant. Not sure if I’m being told to feed nutes, flush, or more nutes. So many opinions it’s hard to judge.

Littlebirdie said:

I’ll post a pic tonight of the plant. Not sure if I’m being told to feed nutes, flush, or more nutes. So many opinions it’s hard to judge.

Click to expand...

I say take all our advice on board, but i think you may have the solution. Just learn and have fun whatever you choose to do.

This is what she looks like tonight. Keep in mind I flushed her and then fed 1/4 nutes. She’s drooping some and still has the yellowing. Stem purple with green streak as well. Weird.Also the stem seems super weak. I’ve always had a fan on her and kept the cfls within 4 inches, never stretched. So much going on in this first grow lol...

Littlebirdie said:

This is what she looks like tonight. Keep in mind I flushed her and then fed 1/4 nutes. She’s drooping some and still has the yellowing. Stem purple with green streak as well. Weird.

Click to expand...

Much, much better already though, and only removed calmag. The pics are night and day! I think you still have a little burn though, in the serrations on the leaf edges. I reckon you could afford to cut your nutes in half.
Regarding the drooping, could be water, which is likely. Although if your roots are filling the pot, and need to transplant itll droop too.
Your plant still looks quite small. I usually start my seeds in 2litre pots and transplant straight to an 18litre. Maybe considering the size of yours, transplant to a 5 or 10litre.
Good work looks like you may have it under control

Ok .... My 2 ¢

1. Transplant FROM SOLO ... Up pot into final size. Taproot will be circling bottom by now.

2. If you are in a good soil mix ( container ) you will not have to feed as MOST soils are pre charged with Nutes - enough to carry plant into a few weeks.

3. There is absolutely ZERO REASON to flush a solo cup.

4. You are locking out because you are trying to manipulate such a small amount of medium - flush / root constriction / etc.

4. Once you up pot ( pre moisten container soil ) tip cup as a plug and gently add in.

Keep things simple

Budzbuddha said:

Ok .... My 2 ¢

1. Transplant FROM SOLO ... Up pot into final size. Taproot will be circling bottom by now.

2. If you are in a good soil mix ( container ) you will not have to feed as MOST soils are pre charged with Nutes - enough to carry plant into a few weeks.

3. There is absolutely ZERO REASON to flush a solo cup.

4. You are locking out because you are trying to manipulate such a small amount of medium - flush / root constriction / etc.

4. Once you up pot ( pre moisten container soil ) tip cup as a plug and gently add in.

Keep things simple

Click to expand...

Agreed, definitely not usually a reason to flush a solo cup.
But i do think a lockout is a lockout, especially coco, and flushing is standard procedure.
Good post, well said.