Help Me To Stop Yellow Tips.

[maimunji]

Hi good people's. I grow in 4x4 600 w mh and my plants is in veg. I grow in coco hempy with perlite at the bottom rez. One of my plant have problem with yellow dying tips at the top. Environment is good 25 °C. and 70 Rh.
I use tap water at 150 ppm. 40 ppm of this is calcium and 10 magnesium. I feed with canna coco 5.8 ph. At 650 to 700 ppm total including tap water. I try different dosage of nutes but nothing helps. I try a&b at 2 ml/ltr. for week nothing change. I try flush with 1ml/ltr because run off ph is 5.4 now run off is 5.8 but problem hit hard after flush and tips at the top dying fast. Now I run 2.5 ml per litre and nothing change again yellow tips. Now I feed with 700 ppm and run off is 500 ppm.
I also try to add cal mag at recommended dosage from bottle 2ml/ltr. I try full dose cal mag half dose and now I run 1/4. Nothing change. Problem is from weeks plant grow well but put more and more yellow tips at the tops.

 

[maimunji]

Huge damage at the top is from flush with coco a&b 1ml/ltr. Before flush I have only yellow tips but not so extreme. I forgot to say I use liquid silicone at every feeding at around 30 to 50 ppm. I water feed every day to run off all 4 plants doing well and growth is explosive.

 

[Toaster79]

You are a bit high on N. The other plants is gonna do the same soon.

 

[maimunji]

What can cause this my basic nute? Why after flush problem hit hard. A lot of grower here use canna coco ab what I do wrong?

 

[Seamaiden]

You are a bit high on N. The other plants is gonna do the same soon.

Agreed, but also do you notice that slightly too-dark green shade going on there? Makes me think there's also a P- going on.

I will say that the haloing effect on that one leaf is odd, I've never seen it before with N+.

@maimunji I personally have never used the nutrients you're using, I can't tell you how they should be used. I don't believe you've reported pH, which is very important in coco coir cultivation.

 

[Toaster79]

Agreed, but also do you notice that slightly too-dark green shade going on there? Makes me think there's also a P- going on.

I will say that the haloing effect on that one leaf is odd, I've never seen it before with N+.

@maimunji I personally have never used the nutrients you're using, I can't tell you how they should be used. I don't believe you've reported pH, which is very important in coco coir cultivation.

I totally agree with P-, but didn't mention it because it will be gone when the N toxicity gets sorted out. I noticed that too much N usually locks P out.

The excess N is most likely from over feeding in adition with CaMg product which also contains a solid ammount of N.

Tips starting yellowing/burning even more at flush is the result of built up salts in coco. With adding large ammounts of pH'd water with little or no nutes makes those salts in the coco fuse with the added water and become greatly avaliable again and remain in the medium if the flush was insufficient.

 

[maimunji]

Thanks for help gays and gurls. Canna coco at 2ml/ltr. Is N 116 P 38 K 56. Ca 105 Mg 40. I have problems with yellow tips long before I start added cal mag. I have exactly same problem previous grow again only with one plant and I grow in peat most compost and feed only with water. If sea remember she try to help me before. I can up this old thread. Ph is spot on 5.8 even run off is 5.8.

 

[maimunji]

This is pics from my previous grow in peat with yellow tips and progression. This plant in peat I feed with nothing only with tap water without nutes. N toxicity again?

 

[Toaster79]

Agreed, but also do you notice that slightly too-dark green shade going on there? Makes me think there's also a P- going on.

I will say that the haloing effect on that one leaf is odd, I've never seen it before with N+.

@maimunji I personally have never used the nutrients you're using, I can't tell you how they should be used. I don't believe you've reported pH, which is very important in coco coir cultivation.

Looking again at those pics makes me think that he has a combination of excess N - tips clawing slightly and excess Mg - dark green leaves, almost blue. Both result in burnt tips. Atleast that's what I have learned myself when over doing things. On the other hand those petioles are nice green color and also I can't see any racing stripes on stems so I would exclude P issue.

@maimunji try rasing your pH a bit like 6.0 or even 6.2. Keeping your pH pegged at certain value can lead in to problems as some plants like it a bit different.

Regarding your last pics/previous run. There you had severe P- and Ca-, wgich go hand in hand. Peat based medium can be rather tricky some times.

 

[maimunji]

Thanks a lot toaster79 my previous grow problems goes away after I start supplement full dose of recomended nutes and full dose cal mag extra which is very high N. Cal mag extra is 4-0-0 with 3.2 ca and 1.1 mag. Burn tips stop and plant go back to health. Now in coco I think I have simullar problem I will keep aye on my run off ppm and will try to bring it up because now I put 750 and run off is 530 ppm. I think my plant is hungry. I grow in coco hempy and plant have rez at the bottom after watering with 750 ppm run off is 530 ppm thats 200 ppm lower ppm in rez which mean coco stolen this 200 ppm. plant is preaty big and drink rez every day.I will try flush until ppm from input and run off is same then I will know for sure what happening. Now ph is stable I put 5.8 and run off is 5.8-5-9
Which is good.
So with this run off data I think my plants stay and eat constantly this 530 ppm in the rez and for this size plant its too low for me. Plants drink rez every day which mean they eat this 530 ppm every day nothing more

 

[Seamaiden]

Looking again at those pics makes me think that he has a combination of excess N - tips clawing slightly and excess Mg - dark green leaves, almost blue. Both result in burnt tips. Atleast that's what I have learned myself when over doing things. On the other hand those petioles are nice green color and also I can't see any racing stripes on stems so I would exclude P issue.

Fascinating, I've never done a Mg+ myself, didn't know that it would give the same too-dark green coloration. We need that in the Charts!

 

[Toaster79]

Fascinating, I've never done a Mg+ myself, didn't know that it would give the same too-dark green coloration. We need that in the Charts!

I'll post some pics when I get back home, probably sunday or monday. I've done some serious damage to my plants giving them too strong Epsom foliar, seaweed with noticable ammount of NaCl, pH fluctuations and so on and so on. Got some handbook cases on hand.

 

[maimunji]

Sea look again pics from my previous grow. You say K- for this symptoms can you say this again for my current run. I know now problem isn't that bad and I only have burn tips but my previous run problem start identical. Look pics again please.

 

[Seamaiden]

No, not for the current issue. I would go with Toaster's advice here since he's seen what you're experiencing, I haven't.

 

[maimunji]

Don't want to say big word but knock on wood burn tips stop. I start to give em full dose cal mag extra which is 300 ppm and this looks like work. Plant greens and perk after second watering no more yellow tips but im now at 930 ppm which is 1.8 ec I start to feel fear from this high ppm. Half dose cal mag doesn't work so I need to cut my base nutes right? Run off is around 100 ppm below what I put in.
So I use 150 tap water around 30 ppm silicone 300 ppm cal mag then canna coco at 470 ppm. Also cal mag have 4 N this is not good for flower or?
Don't know what to do help me please.