Week 6 Flower *Leaves Drying Up, Turning Yellow, Dying* Coco Grow Help!

inTron

Active Member
Hi,

I am growing under a 1k light with 6 plants in 5 gal pots. I am growing in pure coco.

Nutes:
Botanicare CNS17 Coco Grow
Botanicare Cal Mag Plus
Fox Farm Open Sesame, Beastly Blooms, Cha Ching

pH= 6.1
Runoff is getting lower= 5.0-5.4

I was using the label instructions dosage, but then I started noticing nute burn- tip of the leaves were turning brown/light brown. A grower on the forum suggested that I give it a complete flush and then lower the dosage to a 1/4 and then gradually go back to 1/2 strength.

I did what he recommended and I noticed the plants lower to mid fan leaves started turning lime green. I followed up and I was recommended to use some more Nitrogen, but have not done so yet. Most of the plants are normal green, but 2 of the plants are still a little lime green.

I just noticed the fan leaves started showing some dying at the lower set of leaves. It changed pretty quick and I see a few of the leaves just completely burnt and shriveled up. I am currently on week 6 and I am using 1/2 strength of the recommended dosage.

Any thoughts? Thank you!
 

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tyzey420

Member
Now i'm not a 100% certain as im not the most experienced grower, but looking at some of those leaves it could be a phosphorus deficiency.
phosphorus can start to get locked out above a PH of 6.0 as far as im aware, i'd wait for a more experienced grower to answer, just my input as i had the same problem
 

inTron

Active Member
Now i'm not a 100% certain as im not the most experienced grower, but looking at some of those leaves it could be a phosphorus deficiency.
phosphorus can start to get locked out above a PH of 6.0 as far as im aware, i'd wait for a more experienced grower to answer, just my input as i had the same problem

Thanks for the reply. I thought it may be some sort of deficiency, but I was having over feeding problems just last week? I've been feeding them at 1/2 strength, but yeah not sure. I did have the pH at 5.9, but people suggested that I move that up a bit during flowering? They recommended 6.1?
 

tyzey420

Member
http://31.media.tumblr.com/tumblr_luxecxAN221qhh1c2o1_500.jpg this is a very helpful chart! Could be a number of things that cause phosphorus to either get locked out or not have enough available, Give the coco a good flush with PH'd water and see how they respond, the over feeding may have locked it out aswell, flushing coco then going light on feeding and working your way up tends to fix most nutrient problems! good luck bro!
 

inTron

Active Member
http://31.media.tumblr.com/tumblr_luxecxAN221qhh1c2o1_500.jpg this is a very helpful chart! Could be a number of things that cause phosphorus to either get locked out or not have enough available, Give the coco a good flush with PH'd water and see how they respond, the over feeding may have locked it out aswell, flushing coco then going light on feeding and working your way up tends to fix most nutrient problems! good luck bro!
Thanks. Do you think I can recover from this? The leaves dried and died overnight! OK- so you do agree that it is a phosphorus deficiency? I just need to find the source- locked out, not feeding enough, etc etc?

Thanks again, I really appreciate the help!
 

tyzey420

Member
Depends how far into flowering you are, fairly confident its a phosphorus issue, may have stunted growth and put you a little behind but if you fix the problem i'm sure you'll yield something.
 

dimebong

Well-Known Member
Yes it's phosphorus deficiency. It starts as tip burn then starts on the serrated edge. I had this problem using [FONT=arial, helvetica][SIZE=-1]28.5.30[/SIZE][/FONT] nutrients in hydro with root rot. P wasn't abundant enough to get through the root slime like N and K could. I mixed up a light dose of flowering nutrients high in pk and foliar sprayed to correct it. With coco i feed npk1-4-2 coco nutrients full strength every time the pots need watering and the plants have always been spotless.

Are these the same plants you posted about before that were showing clear signs of overfeeding and lockout? they look completely different to these pictures.
These leaves don't show any signs of overfeeding, only P deficiency and pic 3 shows nitrogen deficiency. You need to up your dosage a tad, and flush regularly with coco to get rid of salts that will lock out nutrients. Once you get the right dosage there wouldn't be obvious signs of recovery like a vegging plant with new growth, but the problems should stop spreading.

I don't know how it can go from nitrogen toxicity to nitrogen deficiency when it's only gone from full strength to 3/4 strength, but these pictures show underfeeding.

You should run your cns17 and cal mag only for now until you get the dosage right.
 

inTron

Active Member
Hi again. So I did what you guys recommended- I did a flush with 1/4 strength nutes. I took down the supplemental nutes completely so I am only using the CNS17 Coco Bloom, Cal Mag, and Fox Farm Beastly Bloomz (1/2 strength). PH at 5.8.

A couple of the plants that were turning lime green- I added some nitrogen and the plants went back to a solid green. Thanks for that!

For the most part, the plant looks like they are doing better, but hard to tell since it is only budding and can't see the new growth.

It is now week 7 and I am now noticing the tip of the leaves turning a light orange/brown tip color?!?! This is happening on the top fan leaves and on some of the small leaves next to the buds.

From what you said earlier- it seems like the strt of phosphorous deficiency?!?! How can you tell the difference between nute burn and phosphorus def? When looking into it, it seems like the start of it appears the same?

I am at full strength for the cal mag. 75% for the CNS17 Bloom and 50% strength on the FF Beastly Bloom (high in P and K), but about to switch to the FF Cha Ching.

Any ideas on the tips burning/changing colors? I thought it would be nute burn, but maybe it's phosphorus def and is still an issue?

Once I make a change i.e Flush.....how long does it take to have an effect?

I've been hand feeding once a day. Then I do a watering on the 3rd. So feed twice then water.
Pics attached but it was hard to get a pic of the tips. Hope you notice the tips a diff color.
 

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