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First time grower having spots on leaves any advice much appreciated

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kkaazz2

New member
Hi all I am a first time grower and everything went smooth until I found some spots on small lower leaves and darkening veins on larger leaves, also yellowing tips. I am on week 6 and just changed to 12/12 lights.Any advice please, I have been fertilizing on cannabis nutrient schedule with hydroponics ( floragro,florabloom,floramagic and calmag) thanks in advance:barmy:

Soil or hydro or coco: coco coir, 25% perlite

Strain:shark attack and critical cure, the first is more affected

Photo or Auto:photo

plant age:in week 6

pot size:5 gallon

nutes or additives used and how often for soil:every other feed according to cannabis schedule with hydroponics nutes and calmag,always ph 6.5 and every other feed plain phd water

Air temps (max min):27/20

humidity:20%

lighting type and wattage (hps, led, cfl):250 watt hps

Light schedule:was on 18/6 now on 12/12 as of this weekend

ph level:6.5

EC (hydro and coco only) not measuring


feed schedule and nutes (for hydro and coco)alternating nutes and plain phd water
Thanks!
 

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Hi kkaazz2
Almost certainly is Ca related. What dose of Cal Mag are you giving? When you give "plain phd water" does it also have Cal/Mag?
I recommend you take a look at my guide (link in signature)
recommendations:
  1. Give nutes (including CalMag) in all water (stop the practice of alternating flush)
  2. If you insist on alternating flush, at least put Cal Mag in all the water
  3. pH is pretty high, but that isn't likely the problem. I'd keep it about 6.3 until Ca issues are resolved, then 5.8-6.2
  4. Start measuring EC/PPM (meters are really cheap)
 
Thanks so much.i have been following the nutes schedule from growweedeasy so CalMag has been 2.5 ml per gallon.and followed the recommended phd water only then nuted water alternating.So is it best to always give full feed? I read about your recommendations and ordered a EC pen.i also had not added CalMag to my coco coir prior to growing. My runoff water measurement is ph 7, isn't that very high?TIA
 
Right!
Ca issues showed up when you cut the dose from 5ml to 2.5ml - At the flip. You may need to go back to 5ml
Yes, for purposes of consistent rootzone EC your should add nutes to all water. You should absolutely add CalMag to all water.
SInce plant is having Ca issues inflow should be about pH 6.3. Otherwise inflow pH is better around 5.9. Ignore run-off pH. Worry only about inflow pH, inflow EC and Run-off EC.
Be sure to read my guide
Cheers
 
Continue 12/12, Just increase dose of CalMag. It is possible that going to CalMag in all water will be enough, but I'd increase dose until symptoms are resolved.
 
Yes, This is one of the main points that I make in my guide.
Four most important points...
1. Water often
2. Nutes Always
3. Set EC targets for inflow
4. Monitor run-off EC
 
Hi Campesino thanks for all your feedback.i have been reading your journal and noticed that you have many nutrients that I am not feeding (Armor Sl,liquid Koolbloom and diamond nectar). Are they essential? What are they since I can't find those brands here...EC pen will be here in two days so I will post my readings.Cheers!
 
Armor si is silica. It helps plants grow strong
Koolbloom is a PK boost used during flowering
Diamond nectar is humid acid. Used for nutrient absorption.
None are “essential”
 
Just want to add with that low of humidity you might want to take it easy on nutes especially in soil. Not sure what medium you're using since you mention 3. Looks like you have coco soil perlite mix. You could have a high ec with that low humidity and heavy feeds.

What is the ratio of soil to coco?
 
I am pretty sure that it is 75% Coco and 25% Perlite

In the initial post I think he copied "Soil or hydro or coco" and then wrote his answer: "coco coir, 25% perlite"

I think...
 
But yeah, RH is awfully low! Good call Chefbjy
kkaazz2 Is there anything you can do about that? (There must be! it must take work to keep it at 20)

I'd be surprised though if the symptoms were burn. It is some specific issue and it doesn't all look like Ca but some does. It could be lock out and I think he'll learn something when his EC pen gets to him!

Humidity is certainly something to consider when setting inflow EC targets and RH 20% would require a significant reduction - which is not ideal for nutrition purposes.
 
Yes, it is different in soil. Soil interacts with EC in more complex ways. I'll check it out.
Is there something in particular that you are critiquing in the guide?

And kkaazz2 is growing in Coco.
 
The article is actually discussing the conductivity of the soil. This is a different issue than the conductivity of the nutrient solution.
The article is discussing how you can measure a field's EC to understand different micro-regions within it. Sand is low conducting and clay is high conducting, so by measuring it they can determine composition and other things... Like salt deposits... Which is how soil EC can end up having an impact on nutrient solution EC.

The EC we are discussing here pertains to fertigation (nutrient solution) and it applies broadly to all media - However there are differences. Soil interacts with nutrient solution more than a relatively inert media like Coco.
 
Do you have any articles on soil in pots? Ill have to read that article again. But seems in pots and not the ground we are testing for different reasons.
 
Thank you all for your input! I am actually a she:) so my humidity is low and was 10% since I started to periodically spray the plants it increased to 20%. Not sure what else I can do to improve that? EC pen arriving tomorrow so I will post results and could do with some input since I have never heard of EC;-) Cheers
 
But the whole article is about Soil EC, not Nutrient Solution EC. These are totally different things.
Soil EC can impact solution EC, but that is tangential... They are measuring the conductivity of the ground not the water! Different things!

I don't see anything in the article that is relevant to growing in pots or containers. It is a discussion of open fields and understanding what a farmer is working with. You should know what you're working with because it comes in a bag!

You need to look for articles on "fertigation in soil", not "soil EC"
 
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