Look Out, excess or deficiency?

[Hasch]

Aloha

Here is the plant as of right now:

4 days ago I noticed some burned tips + a few burned spots near the boarders of larger leaves. And on some leaves the spaces between the veins were a bit yellow / lighter green.

After consulting different online sources (royal seeds, durch passion etc) I was more confused then before.
Mobile nuts, semi mobile and non mobile, too much, too little, lock out...

I then went with a semi flush= just watering with phed water with a little Rhizotonic + Alfa Boost (ph 5,8 ec ~0,5) and (no other nuts).

After 2 days the new leaves still develope with burned tips. And some Fan leaves are like this now:

What to do?

 

[Hasch]

I grow on coco mix from Plagron (70 coco + 30 perlite) with a little worm casting mixed in. Also in the top 10cm I mixed in some potting soil for seedlings (little nuts).
It is an auto Jack Herer from 420 Fas Seeds

Last night I watered with deluted nutes (ph 5,8 ec~1,2)

Not much improvement as far as I can see

 

[exploziv]

What was your usual feed before the problems? What ph? Do you ever measure runoff ph / ec?
I think you have some Mg deficiency but seems like other problems are present too, so look out for overwatering or maybe too acid PH in the grow medium.
P.S. ec 1.2 is not diluted nutes. It's more than enaugh for a full grown plant in most cases.

 

[StickyBandit]

What plant is it?

 

[Hasch]

Auto Jack Herer from 420FastSeeds

It seems excessevly stocky to me. Maybe also an indicator of some nute deficiency?

 

[exploziv]

Check the runoff ph and ec to be sure is not overfert or acidification first.. also make sure you are not overwatering.

 

[Corpselover Fat]

I'm no coco expert, but coco shouldn't look this dry.

 

[exploziv]

In big pots like that the surface might dry a lot faster than the rootzone, especially if plant doesn't uptake much water. Near the rootzone it looks way more humid, from what I can see in the pics.

 

[Hasch]

Thank you so much for your input!

I will get the water ready and inundate the stocky lady til there is enough run off to check.

So far I have only watered (by hand) until the pots were really heavy. In the shop were I bought the equipment I was told to go by weight: ~1/3 lighter and it's time to water.

They are 12l Airpots

 

[exploziv]

Thats a mistake not having runoff in coco, I can tell you the ph and ec of runoff has big chances of being off.

 

[Hasch]

Hey

3,75l water prepared for flushing: PH 5,85 and ec 0,5

Run off:
PH 6,9 ec 0,8 - 1

Before meassuring I discarded the first part of the run off.


Hm, what does that indicate?

 

[exploziv]

High PH, HIGH EC. And, unless the nutes you are giving have no Mg, we are probably looking at Fe or Fe + Mn deffs caused by unavailability due to those conditions in the grow medium, and not Mg. Continue watering at around 5.5 PH and EC as low as possible (allways allow runoff) till they bounce back. Use some foliar ferts to help them absorb some micronutrients as soon as possible. You should have measured the whole runoff, not discard some, cause now we just know its higherthan it should be, but in reality it might be scary high.

 

[Hasch]

Ok, again thank you!

I was a bit disconcerted by the development of the Jack H. The other one (Gorilla Cookies auto) is doing splendid (afaik it likes higher nute content).

I was told to discard the first 1/4 of run off since it could give misleading data (dry pockets in the substrat, etc...)

 

[tobedetermined]

Thats a mistake not having runoff in coco, I can tell you the ph and ec of runoff has big chances of being off.

Like he said. ^^^^^ You should water daily. Coco/perlite is hydro media and so it relies on constant moisture from nuted water moving through the roots. It is just a little slower than a dwc.

Once you have flushed them, get back on your lower nute schedule for several days.

 

[Hasch]

I was feeding Cogr Flores from Canna and am supplementing with N during veg.
Cogr is a 2 part fertilizer: part A has Fe chelat DTPA + EDDHA, part b has Mn and MgO

Suggestions for foliar ferts (preferably with Fe, if uptake through leave is possible)?

 

[Hasch]

Concering foliar ferts: ok to use destilled water?
And what ph and ec should I be adjusting to?

 

[troutman]

pH like others mentioned is a good place to start with.

Feeding some plants more nutrients than others and observing the
differences can give you an insight of what is going on. Adjust the
nutrient levels to the plants that do better. It's always safer to
experiment with a few plants before risking the entire garden.

Good Luck.

 

[Hasch]

Like he said. ^^^^^ You should water daily. Coco/perlite is hydro media and so it relies on constant moisture from nuted water moving through the roots. It is just a little slower than a dwc.

Once you have flushed them, get back on your lower nute schedule for several days.

I am a bit confused by that suggestion, I have read from many growers (+ seen YT video from Canna) that when hand watering + big pots partial drying out the coco substrat is the way to do it.

 

[tobedetermined]

I never let my coco dry after the seedling stage. I hand water as well - with a healthy runoff every time. Many growers feed their coco multiple times a day with automated systems and they get spectacular results. It is just nuted water passing through a a fairly neutral media populated with hungry roots. So you have to keep them feeding them.

 

[Hasch]

Thank you, that makes sense to me.

This is a tiny grow, just these two ladies.
More for the tinkering, hopefully the sense of achievment and knowing the end product is not contaminated by anything...