Leaf problems. Please help.

[gonz_DK]

Hallo everybody, hope you can help.

For quite a while I had this leaf problem, first they look like they had to much fertilizer, then they turn brown on the edges and and at last, they rotten.

I´m growing in coco and uses Canna products. After the signs of to much fertilizer, I only gave then 5ml of each A+B, 5ml cannazym and 2,5ml rhitzotonic to 5 liter water. I´m 13 days in to flower, the tempature is 28-31, the PH value is 6,7. I don´t have a EC meter yet because of the postservice. Ordered it 14 days ago, still waiting.

Some pics to help you, help me.

They are even yellow on the tip of newest leafs.

 

[metamorf]

hey gonz
nutrient burn for sure, also pH is too high, needs to be around 6, preferably 5.5-5.8
the yellow tips on the new growth is also consistent with nutrient burn.
flush your coco with pH-adjusted water with 3 times the pot size in water (18 l for 6 l pots etc)

they look fine otherwise, you'll be ok!

 

[gonz_DK]

Thank you for the response.

Do you mean I should give them all 33L Ph-adj water at one time? As you can see I´m using 11L pots.

 

[stinkyattic]

Yes Gonz, when you are trying to flush out the extra fertilizer in the soil you should use the same volume of water as 3 times the pot size, adjusted to a correct pH.
Then right after that, you give one last watering of some fertilizer solution at half strength and at the correct pH of course.

 

[gonz_DK]

Thank you guys.

My problems continue, I havent been the smartest guy though.
I did what you said and flushed whit 33 liter ph-adj water,
it didnt seem to be enough so I gave them 20l extra. That helped
so I feed them to days after with, 5ml pk 13/14, topmax 5ml and
5ml of cannazym, to five liter water. It worked and three days
after I feed them again with the same as before and coco A+B,
but only 2,5ml of each to five liter water. Nuteburn again, leaf
turn yellow and clawing, but they seem to need some thing
maybe Phosphorus deficiency, but I don´t know. I try´ed and gave
them salt magnesium, but again, it didnt help. It did just the opposite.
So I flushed again, waited three days where I watered with clear
water and try´ed feed them again with 5ml pk 13/14, topmax 5ml and
5ml of cannazym, to five liter water. Nuteburn. I flushed with 20l this
time and yesterday I flushed again with 20l. on Saturday its 14 days
since i feed them.

Pics from yesterday.

Edit: I´m 37 days into flower

 

[gonz_DK]

Please, anyone ?

 

[gonz_DK]

It must be Phosphorus deficiency, after what I can read.

If you have a phosphorus deficiency you should use any N-P-K ratio that is over 5

Would it help if I gave it some PK 13/14 ?

 

[metamorf]

What pH are you feeding at now? Got the meter yet?

 

[gonz_DK]

Hey metamorf, sorry about the lack of info but i´m in a kinda panic here.

No Ec meter yet, canceled the order still need the money. If its really a big problem I dont have a EC meter, I´ll order one right away!

Temp is at 27-30 degrees
Ph is from 5,2 to 5,8

I had this problem almost from day one and
it just keep getting worse, every day.

 

[knna]

Please, post pics of the full plants.

It seems you slighty overnuted, but the part of the plant visible in the pics arnt showing sign of any severe overfertilizing, probably due to the flush you did.

What is claerly visible is sign of a mayor Mg deff on the worst leaves, and too at other ones. As its coupled with signs of K deff (browned edges rolling up), it points to a cations lock out. I want to see the top of the plant to see if there are signs of Ca or micros deffs. It so, it would point to hard water as the cause. If not, to a high ph locking out Calcium uptake wich has accumulated and are locking out Mg and K.

After writing this, ive read you are using ph 6.7 So you had created a mayor Ca problem, wich is the worst you may have in coco growing. Reduce strongly coco A feeding (it carries the Ca, and most of the N, as you are already flowering and your plants are well N feeded, it may result on bottom yellowing but without severe side effects). Try to low humidity to increase transpiration (with lead to increased water and Ca uptake).

And, most than anything, set ph low (5.3-5.6) to help in the faster Ca uptake, and dont allow to go over 5.8 for some time. To fix the Mg deff, foliar feed with epsom salts (you can add it too, softly, to nutrient solution, but until you achive a reduction on Ca stored in the coco, it will help very little). I dont see sign of the K deff except on the worst leaves, so i wouldnt worry for it at the moment. If it goes worst, then post it.

 

[gonz_DK]

Hey knna, thank you for the response.
I have already change my ph to between 5,2 and 5,8.
I havent feed them for 14 days now, so its really strange.

Some overall pics.

EDIT:
Do you know a place online, where I can buy Epsom salts?

 

[knna]

No, its not strange. A Ca accumulation only get fixed by Ca uptake itself and cutting Ca feeding (cut completelly coco A and feed only with coco B for some time): as said before, its the worst that can happen, with the slowest recovery (and larger impact on final yield). On the full plant pics it seems there are signs of Iron deff too, and maybe Zn. Do you use hard water? Inform us of what do you know about your water quality.

The flush has resulted on a general underfeeding coupled with the older problem. I think its time to foliar feed (max 1/4 of the watering dosage) until the problem is fixed (try to avoid spaying buds). Increase watering dosage too, its too low now(but avoiding or using little coco A on waterings: but you may use it on foliar, your plants need micros).

If your water isnt soft, using distilled or RO will help reducing faster the Ca accumulation problem.

On the other hand, are you using not pretreated coco? (unknown brand bricks).

Sorry, i dont know where to buy E salts, i buy them locally (nurseries and garden stores often carries it).

 

[stihgnobevoli]

um you can buy epsom at your local grocery store. its used for soaking your feet or whole body.

 

[gonz_DK]

Thank you so much for your help knna, I´m lost with out it.

Ive just sprayed the leafs with 15ml coco B, to ten liter water
and ordered two kilo English salt (Epsom salt), but it will take
some time before its here.
I have these "mega magnesium" tables, for every three pills there
are 600mg magnesium. Can they be used in the mean time ?

I have suspected the water before, but don´t know how to check
if its hard or soft.

I had the light off for a moment, so I took an overall foto.

and now the leafs begun clawing.

 

[knna]

Thank you so much for your help knna, I´m lost with out it.

Ive just sprayed the leafs with 15ml coco B, to ten liter water
and ordered two kilo English salt (Epsom salt), but it will take
some time before its here.
I have these "mega magnesium" tables, for every three pills there
are 600mg magnesium. Can they be used in the mean time ?

15ml/10l water si too much, you can burn leaves at that concentrations by foliar. By foliar, you can use the coco A too, its to the coco where you must avoid it for the moment. Wait two days and spray with 5ml each A and B.

No idea about the pills, but for the moment the foliar with coco A+B should avoid deffs agravating until fixing the coco problem. Im strongly suspecting it wasnt only the high ph used during veg, but too a hard water issue.

I have suspected the water before, but don´t know how to check
if its hard or soft.

First way is measure it with a EC/TDS tester. And then, checking its ph. High EC/TDS coupled with high ph is hard water.

The best is to obtain a water analysis. Its often at city councils and/or water distribution company (they must provide water of quality between legal ranges).

In the meantime, may you use distilled water?

 

[gonz_DK]

So now I got the epsom salts home, and my plan is
to give the plants one teaspoon to 10L distilled water.

I will also foliar water today, with 5ml A+B as you advised me to.

What will be the next thing I have to do, for limit the damage ?

Thanks again so much for your help!

 

[knna]

So now I got the epsom salts home, and my plan is
to give the plants one teaspoon to 10L distilled water.

I will also foliar water today, with 5ml A+B as you advised me to.

What will be the next thing I have to do, for limit the damage ?

Thanks again so much for your help!

Wait and hope the coco recover the balance between mg and Ca as sooner as possible. Excess Ca lock out has the slowest recovering, so you will need to keep helping by foliar for 1-2 weeks until the plant is able to uptake all elements fine again. As the lower ph result in reduced Mg uptake, at least you will need to foliar with the E salts for a while to avoid the Mg deff goes worst. You may add a little of A+B to the foliar solution if you see little improvement, but 1-2ml/gal as max. A surfactant helps in foliars uptake, a small drop of liquid soap works fine.