anthracnose or calcium deficiency?

[abuldur]

hello

This has been a problem for over five yields.
hps 600w.
aquafarm
500 m²/h out and 700m²/h in with carbon filters.
bczz ferts and boosters following fert charts
fans 24/7 directed towards canopy
ph 5.8
ec 1 to 1.6
90 days of flowering Jack Herrer sensi seeds using clones .
temp 22 celcius day 15 c by night
humidity between 40 and 60
using hard water ec 0.4 out the tap.
I also add a little calcium and magnisium (calgreen metrop 1ml/10l) all stages.
Flush every week with h²o² and hygrozyme ph 5.8 ec 0.8
Change tank every 2 weeks.

Thanks for your comments.

Peace

 

[Kr@kEn]

Is that a spider mite on the bottom of that leaf? Look for webs.

 

[abuldur]

Nope ,no spider mites .
been there ,done that ....

It' s the other side of the leaf.
That's what the orange spots look like on the other side.
Would calcium def look like this?

 

[MynameStitch]

Can you post some pics without the hps light on?

Yes, calcium does do this..... can you explain a little more information in detail?

Looks like you have a lockout more than anything else, you should not be having calcium issues. How often do you check your pH?
Your problem is your following your charts from bcuzz; your over feeding them.... what ppms is your plants nutrients set at? NEver listen to those directions; they lead to burning so much; now if you were using a different brand like AN,canna or GH would be different. I would flush out your system and replace with lower amount of nutrients.

Does anyone know what EC 1.6 is converted to ppms......

I know it's on the high side...
Since it's something that has been going on 5 grows now.. it's something your doing to the plant..... and I say nutrient levels are locking out calcium which means your EC/PPMS are too high.

Also forgot to ask what are your water temps?

 

[abuldur]

Thanks for your answer .

I'll take the pics today.Sorry but i suck at taking pictures.

I check the ph every 2 days with hanna ph tester properly calibated.

I top of every day with 10 l of water plus ghe bio bloom.ph 5.8. 350 ppm.

I am actually a little under the bcuzz ec charts,i running them 1.3 to 1.6 which is not that much.

http://www.4hydroponics.com/convertPPM.htm

1.3 ec is 910 ppm
1.6 ec is 1120 ppm

As for the water temps i did not bother to check but i will today.

I guess they are pretty low cause my room temp is .

Yesterday: max 21.5°c lowest 13°c at night ,which is pretty low.

It is cold over here and there is not much i can do concidering the high humidity in my growspace.I have to keep the vent on which brings cold air in.
If i dont every thing will get moldy.There is already a little electric heater going on at night but its best is not enough.

I guess the water temp is 3°c under room temp.

PEACE

 

[Core]

i think hanna uses the 0.5 conversion...so 1.3 EC would be 650 and 1.6 EC would be 800...you are using the 0.7 conversion ..

here's a chart Stitch ...

 

[MynameStitch]

Thank you very much for that chart core; I was looking for that and I could not find it anywhere much much appreciated!!!

It could be a calcium issue; but if your tap water is hard you should not have any issues BUT, hard water will make it hard for your plants to absorb it's nutrients; maybe you would be best to invest in a RO system......

Ya, 200 PPM's tap water is very hard; when the plants remove nutrients from the water, are you adding more nutrients and checking the ppms?
Does your pH rise in a day or 2 or go low?

So your grow may be being messed up by the hard water..... see it a lot.

Can you take a pic of the plant without the HPS light on?
take a few pics of the affected leaves without the hps light on too so I can see the leaves better.....

It might be hard water damage... I have seen this before; let me go re-read the article I read.....

are you letting your water sit out before using it? If not then your plants may have some chlorine issues; with the high levels of chlorine.... hard water tends to have more choline I read; I have no clue why but I heard it does.

Edit: ok, found out what it is!!; it is indeed hard water damage; not calcium issues; it mimic's calcium issues......

http://hcs.osu.edu/hcs/webgarden/Land/LAND_May95.html

Typically, hard water will leave white (calcium or magnesium) or orange (iron) spots on leaves.

So you are going to have to get a different water source...
How often do you change out your res? WHat do you use for pH down?

 

[abuldur]

My water is very hard and actually smells like chlorine and i do not let it sit .

When i change my tank the ph tends to go up for 2 or 3 days. I have to put ph down for this duration but then it stops.
Ph ranges from 5.7 to 6.2 during these first 3 days.

I will take pics today.

Thanks

 

[abuldur]

I was using ghe ph down during entier grow but i changed for growth technology
phosphoric ph down a week ago.

I change my res every 2 weeks.
And i somtimes use source water (ec 0 ph 5.8) but i havn't been using it lately it's an houre drive away plus i have to carry 100 liters.
I do not do this often enough to see the impact.

 

[MynameStitch]

For one thing you should always let it sit out; another thing that is very important; how often do you clean out your system?
There is no doubt about it; you do have hard water damage this causes plants to stunt.....

So if you want to fix your problem your going to either have to stop growing hydro or get a reverse osmosis system put in.

What do you use for adjusting your pH?

 

[abuldur]

A few pics taken at night
Sorry got two left hands.









I could not mesure the water temp having no thermometer.But the room was that cold:



I guess water temp was 2 or 3 degres under.

I clean my aquafarms every 2 weeks when changing the solution.And i use 82% phosphoric acid from Growth Technology.

Thanks for your interest.

 

[MynameStitch]

Ya, either chlorine damage or hard water; so it all revolves around your hard water......
The temps have got to come up; thats way to cold for them; either get a space heater around there or keep something that can keep heat in a certain area that won't be a fire hazard.

 

[abuldur]

Thanks Stitch.