burned tops

[SkyLopes]

hi there, this lady had an iron def due to excess of nutes and i flushed it... now after 7 days the green color is coming back (it was way more white than that) but the leafs on the top are getting damaged.

i still didnt feed it since the flush

whats is better to do now? start feeding again? cut the damaged leafs? cut the tops?

they are 5 days flowering... help me my friends.. thanks

 

[SkyLopes]

anyone? help if possible... thanks...

 

[sproutco]

Interveinal chlorosis on new growth does not always = iron deficiency. I am pretty sure it is a micronutrient problem. Your ph may be high. You could also have root damage. You said that you used excess nutrients. Interesting how the tips of the leaves are curling round and round like a pigtail. You will also notice the burn across the leaves is occurring about mid point in the leaf with the tip remaining green. Leaf burning off as it expands. I am going to go out on a limb and say possible copper deficiency (we had a similar thread complaining about pigtailed leaves a few days ago). This would go along with excess nutrients especially nitrogen or less so phosphorus. It could also be multiple deficiencies running together. Anyway, add more details about your grow like ph, soil ingredients, nutrients your using, etc...to get a better answer.

1. Pigtail spiral of leaf tips
2. Buring of leaf in middle as it expands

 

[SkyLopes]

growing on coco.. ph after flush is 6.5 and ec 0.13 (check from runoff)
i checked this yesterday...

i just got dyna products today... the 7-7-7 and 3-6-12

more info about it http://www.dyna-gro.com

will start using them from now on

my other fert was a local fert, it had all micronutrients needed but i guess it was not that good..

 

[sproutco]

There is your answer. The ph is too high.

 

[SkyLopes]

just checked runoff again and ph dropped to 6.3 and ec 0.11

do you think i can feed her with a ph balanced weak solution?

 

[sproutco]

Are you using distilled water to check the runoff? This would be most accurate. Your ec appears to be nothing but water and no salts. Here is an interesting thread about growing in coco. You might want to take a look at this sometime. http://www.icmag.com/ic/showthread.php?t=23140 One more quick question. What is the type of micronutrients you are using? Are they, for example, iron sulfate or iron edta chelate? Copper sulfate or copper edta chelate?

 

[SkyLopes]

its tap water.. usually i do with distilled just like in your article but my tap water is very good and results are very similar always... my tap water is ec 0.05 and ph 6.8-7

 

[sproutco]

One more quick question. What is the type of micronutrients you are using? Are they, for example, iron sulfate or iron edta chelate? Copper sulfate or copper edta chelate?

 

[SkyLopes]

well mate, i dont know.. it doesnt say on the boottle... but i heard dyna products are fast absorption

and yes, its just about water with no salts... like i said... i flushed it about 7 days ago

i think i will feed it tomorrow... she is sleeping already

 

[sproutco]

When the ph gets above 6 with sulfate forms of micronutrients like copper sulfate, they tend to become insoluble. Even chelates like iron edta chelate begin to not function well at ph 6.5. They let the iron oxidize or form another insoluble compound. With iron deficiency, like you thought you could have, the leaf tends to go completely yellow to white with no burning. So, I am not sure of your diagnosis. Drop the ph to the high 5's and report back. Try ph 5.8 with your nutrient solution. Adjust ph after adding the ferts. With such a low ec you can go ahead and feed them. What makes you think you used too much before? This would show up as burned edges of the leaves starting at the bottom unless there is root damage which could show up as iron deficiency like your suggesting.

edit: I just thought I would add that alot of these ferts will use the chelate forms of iron and then add the less soluble sulfate forms of everything else.

 

[SkyLopes]

sproutco, im sorry, just checked the bottle of dyna again and its says it contains EDTA.... iron, copper, manganese and zing are all chelated

im pretty sure my other fert does not contains EDTA and chelated micronutrients as it says nothing about it... i will be using only dyna from now on

hope it helps

 

[SkyLopes]

sproutco, like i said the burning only came a couple of days ago... about 5 days after flush.... i flushed because im sure there was an iron def, with very pale green leafs on new growth

 

[sproutco]

Edta will stop working as a chelate at around 6.5 or so. You should try 5.8 ph from now on. It will only increase the solubility of the micronutrients. Like my edit stated before, alot of these ferts will use the chelated form of the micronutrient iron and then "throw in" less soluble forms of the rest in the sulfate form. These don't do well over ph 6 or so.

 

[sproutco]

PH around 6 is good for coco

I found this quote for you by bonecarver OG. Aim for a little lower ph than what you have been using. http://www.icmag.com/ic/showthread.php?p=369617&highlight=ph#post369617

 

[SkyLopes]

i didnt ph'ed water before flushing thats why ph increased i think.. i will be giving nutes with balanced ph tomorrow..

i know i gave a lot of nutes because i was feeding with ec 1.7 and was giving like a litre per day lol


will feed them very soon

thanks for the help mate

 

[sproutco]

Check out this description of copper deficiency I have

Interveinal chlorosis occurs on young leaves, but unlike iron deficiency, the leaf tips remain green. More severe deficiencies result in the leaf blade tissue collapse as it expands. This results in very small leaves, which appear burned back due to desiccation. The burning symptom will affect a few leaves and then stop. After a few nearly-normal leaves appear, the burn can occur again.

Notice in this picture the leaf tips are green and the base of the leaf is getting chlorosis...I put arrows on the leaves that show this.


Plus, your getting burn. And you have "pigtail" leaf tips.

What does everybody think? Did I get the right answers?

 

[Blackmelo]

hello skylopes,
hope your plants get better with the advice given. Have never had symptoms like your plants have but I'll agree with sproutco to lower your ph.

Coco coir is a hydro medium and hydro needs a ph of 5.5-6.3.