Yellowing in week 5 flower-Coco

[whosthatguy]

Hey guys, my plants are yellowing up and dying mid flower


In pure coco, running GH 10 ml/g micro and 15 ml/gal flower, foliar spray gh liquid kool bloom. I had some issues with fungus gnats put with recently applied mosquito dunks the population seems pretty minimal

I was running calmag in veg, but stopped in flower (using tap water)

 

[whosthatguy]

 

[RubeGoldberg]

few questions

1. pH of the feedings and waterings
2. pH of the runoff
3. How often are you feeding compared to watering?

 

[whosthatguy]

1. I'll have to get back to you on runoff ph
2. Ph when feeding is 5.9
3. I feed daily

 

[Grass Lands]

looks like they are being burnt from to much nutes...what is the PPM coming out after you give them a feed...?

 

[whosthatguy]

I've been giving them the same base 10ml micro 15ml bloom since they were very small and theyve never been burned. PPM is about 1200

 

[jackmayoffer]

Have you given them a good flush?

 

[40AmpstoFreedom]

You need to be running 6/9 go check out gratefulheads sticky in the coco forum or reservoir forums 6/9.

 

[whosthatguy]

I used to run 6/9 but after krunchbubbles recommendation 10/15 has been running better than ever


Gave them a flush of straight water (5.9 ph), 1 gallon per pot (they are in 2 gal pots) is that enough to flush well?

 

[CannMan]

Calmag

 

[40AmpstoFreedom]

That recommendation is burning the shit out of your plants though...

And cal mag is the last damn thing you need to add. You don't need cal mag at all with even 6/9 much less 10/15.

Adjust your ph to fix cal mag problems up or down adding cal mag to coco with 6/9 will just cause lockout and whole new slew of problems.

Here is my first run with coco ever 6/9 I am currently running:

https://www.icmag.com/ic/showthread.php?p=4643276#post4643276

You're frying your plants.

Best CoCo advice period: https://www.icmag.com/ic/showthread.php?t=55683

 

[RetroGrow]

Looks like light burn to me on the top leaves. And I'm going to guess root aphids.
Have you checked your roots?

 

[RubeGoldberg]

That recommendation is burning the shit out of your plants though...

And cal mag is the last damn thing you need to add. You don't need cal mag at all with even 6/9 much less 10/15.

Adjust your ph to fix cal mag problems up or down adding cal mag to coco with 6/9 will just cause lockout and whole new slew of problems.

Here is my first run with coco ever 6/9 I am currently running:

https://www.icmag.com/ic/showthread.php?p=4643276#post4643276

You're frying your plants.

Best CoCo advice period: https://www.icmag.com/ic/showthread.php?t=55683

Agreed heavily with this, no more calmag!!


You can fix this somewhat by doing the following.

1. Raise the PH on the intake to around 6.3-6.5 Your runoff when you test it is likely going to be coming out in the mid 5's

2. Only feed or water when the rootmass is dried up, if you are getting this on a daily basis, use bigger pots next run around.

3. To play on the safe side of things and spare your plants more drama. Try to do at least 2 ph adjusted waterings between every feeding with nutes and get a reasonable amount of runoff.

4. If I am right about the runoff that I mentioned in step 1, avoid feeding until the runoff comes out at around at least 6.


A lot of people will start posting in this thread telling you to crush up asprin, piss in your waterings, add mollases etc....

If you follow my steps you will correct the lockout conditions you've caused, the necrosis won't heal and this late in to flower you will experience a yield loss, but you will correct it.


Basically the problem is most likely feeding frequency, you aren't burning the plants persay, but the buildup of nutes is causing lockout conditions by throwing the pH since the plant can only really absorb its full range of "elements" within a certain pH range.

in the future, come up with a schedule like feed feed water during the week, sizing your pot where you only need to water every 2-3 days, insure you get reasonable runoff and start your ph off in the low 6's and you will never see this problem again

 

[Laventille]

2. Only feed or water when the rootmass is dried up, if you are getting this on a daily basis, use bigger pots next run around.

Why let the root mass dry up Rube?
I would'nt recommend feeding a dry medium (soil or coco), so I'm curious about that bit of your advice man.

 

[RubeGoldberg]

Why let the root mass dry up Rube?
I would'nt recommend feeding a dry medium (soil or coco), so I'm curious about that bit of your advice man.

Dry within reason is what I mean, not bone dry, sorry for not elaborating further.

What I was getting at is that a daily watering is too frequent and wont encourage the roots to spread out, OR if the pot actually does dry out daily, then a larger pot is needed.

When I said "dry" i just meant that it shouldn't be watered if its already wet.

 

[HueJass]

Looks like light burn to me on the top leaves. And I'm going to guess root aphids.
Have you checked your roots?

I agree on the RA's. That's how they get you. Check those roots and put up some sticky traps to be sure.