Yellowing 1st week into flower

[KissOfDeath]

When I got these two plants they were in coco, a media with which I have no experience.

Media: Coco
Light: Vented 600w HPS about 18" above plants
Temps: lights on 80-85. lights off 70-75
Nutrients: Lucas Formula with Advanced Nutrients Micro and Bloom 5mL/10mL gallon - ~1100ppm @ .7 conversion. I use tap water, which has a ppm of 70.

They were nice and green when I put them into flower, but quickly started to yellow and show chlorosis/necrosis on the tips of new growth and the veins of older leaves.

After reading the coco-specific threads on here, it seemed I might have a Calcium and/or Magnesium deficiency resulting from a lockout caused by the coco holding too much Potassium.

I flushed thoroughly with Clearex, pH adjusted to 5.8.

I added 5mL/gallon of Cal-Mag Plus to my nutrient solution, then diluted it down to 800ppm. I've been watering every day, which is what I read coco likes. Any runoff is immediately tossed. I don't let the plants sit in it.

The plants don't seem to be showing any improvement. Any thoughts?

Have I left any information out?

Pics are in my gallery. I'm too stupid to embed them, I guess. Keeps complaining about having a URL in my post.

 

[MynameStitch]

You have no nitrogen in your mixture, sounds like you have a nitrogen deficiency...... you have any pictures? PLants still need nitrogen in flowering but small amounts; your plants should not be yellowing now untill near harvest. Natrual yellowing towards the end is normal, but you are way to early for having nitrogen issues.

 

[KissOfDeath]

Thanks for the reply, Stitch.

I came to the same conclusion. Flushing and low-strength nutes didn't seem to be working. So, since initially posting, I mixed up a gallon of distilled water with 15mL of PBP Grow and 5mL of Cal Mag Plus and pH adjusted to 5.8.

I only added that to the larger of the 2 plants, in order to give me a frame of reference with the "untreated" plant.

The ec kinda scares me since my meter is telling me that mixture brings me to 1.93. Isn't that awfully high?

Unfortunately, you'll have to check my gallery for the pics. It won't allow me to add them to my post for some reason.

Thanks again! I'll keep you posted!

EDIT: Just recalibrated my meter. Seems ec was off a bit. After calibration, the solution reads 1.8. So that makes me breathe a bit easier.

 

[Guest]

5 mil per gallon cal mag plus in addition to what you are feeding should fix it...peace

 

[MynameStitch]

5 ml of cal mag is high man..... I wouldn't go over 2 ml of it

15 ml of pbp is nuts... would not use that unless you are using a metabolizer booster, but in this case I would not use this much period considering you are in flowering now.

How big are these plants? You are in flowering they do not need that much; to much nitrogen delays flowering... so I do not see how adding that much will fix it; it's completely overkill imo.

Not to mention those leaves are yellowing from the top which indicates you have a micronutrient deficiency.... looks like possibly iron.
You need to get some earthjuice microblast and use 2 ml per gallon of that.

that ppm you just added to your plants..... you are burning them if you added it already.... now you have a whole new issue starting soon.

You do not need that much nutrients for that size of a plant man.....
that is not very big.

You need to get on a sechdule of feeding your plants like weekly; and learning not to listen to the back of what it says on your feeding bottles.
They are so totaly over kill.

You need to definatly get a hold of some micronutrients..... badly.

 

[KissOfDeath]

I'll cut back on the nute strength and make sure there is plenty of runoff next watering. How much PBP would you recommend? 5mL per gallon along with the 2mL of CalMag?

The larger plant is about 18" tall soil to tip. They were only in the beginning of the second week of flower, so I was thinking I'd revert back to veg until they are healthier. No pre-flowers showing or anything yet.

Feeding weekly seems contradictory to everything I've read about growing in coco. Everyone seems to recommend daily or every other day. So, I just want to confirm that you know I'm in coco and not soil.

I'm also curious why the Cal Mag isn't sufficient to address the deficiency. I'm not trying to be contrary. I just want to learn something while fixing the condition. The whole "teach a man to fish" thing...

Thanks again.

5 ml of cal mag is high man..... I wouldn't go over 2 ml of it

15 ml of pbp is nuts... would not use that unless you are using a metabolizer booster, but in this case I would not use this much period considering you are in flowering now.

How big are these plants? You are in flowering they do not need that much; to much nitrogen delays flowering... so I do not see how adding that much will fix it; it's completely overkill imo.

Not to mention those leaves are yellowing from the top which indicates you have a micronutrient deficiency.... looks like possibly iron.
You need to get some earthjuice microblast and use 2 ml per gallon of that.

that ppm you just added to your plants..... you are burning them if you added it already.... now you have a whole new issue starting soon.

You do not need that much nutrients for that size of a plant man.....
that is not very big.

You need to get on a sechdule of feeding your plants like weekly; and learning not to listen to the back of what it says on your feeding bottles.
They are so totaly over kill.

You need to definatly get a hold of some micronutrients..... badly.

 

[MynameStitch]

oh ok my bad never mind, I thought I seen it somewhere you said coco and soil.....

The main reason why it's not fixing is because you are burning your plants you are adding to much, some of those leaves are burned... you also have a micronutrient issue... you have any iron in your micronutrients?

First get the plant back on track.... to much nutrients lock out micronutrients.. it all depends. PBP is strong..... that is your main problem you are using to much.

Now if you had a good amount that would not cause you issues then the cal mag would fix your problem.
but adding to much of that can cause issues; but it would take a lot of it.

 

[KissOfDeath]

That certainly makes sense. Thanks again, Stitch.

Luckily I had only just applied the too strong PBP solution right before reading your response. So I was able to quickly flush it through with a much weaker mix - 5mL PBP with 2mL Cal Mag Plus.

I also made a trip to the hydro shop and picked up a quart of EJ Microblast. I gave them both a foliar feed of that after the lights came back on a little while ago.

Thanks for the heads up on that product.

And, yes, the AN Micro (which is what I was using originally) says it contains 1% iron. I guess I just applied too heavily and created a lockout condition, just as you described.

You would think the PBP would contain some as well, or users would inevitably run into this issue, but it is conspicuously absent from the guaranteed analysis info.

Hopefully this will turn them around. You rock!

 

[MynameStitch]

Np, good thing you fixed that real quick. I know what you mean; unfortunately there is no perfect solution that has every micronutrient they need. Earthjuice microblast is missing a few... like calcium but you have cal mag so no worry there. everytime you feed I would use a little earthjuice microblast with it. With the PBP your plants should start to recover.. if they do not then your dose you are giving them are still a little to strong; you should have no issue with the plant absorbing micronutrients. I am not sure if the leaves on the upper plant will get there green back or not... I know if you get a magniseum issue fixed quickly the green will come back.
But most of the time the leaves that are deficient do not recover... so you always have to look for them not to appear on other leaves and semi newer growths.

 

[Guest]

Earthjuice company

Earthjuice company

Makes a product called sugar peak 1 blended or three part system like gh but all organic just letting u know my plants love it. I just use the 1 part that already blended and no problems just my 2 cents.


Hope all goes well. I had the same problem look in my gallery and it was lock by to high ph but fixed with the right care.