First time coco grow yellow blotches

MannyPacs

MannyPacs

Well-Known Member
FatBoyVik said:
Cheers for that, it sure does make me understand the complexities of nutrient availability.. I will Lower the Cal mag as you said and up the feed so the total comes to around 1.4-1.5 ec.

Also you said you add 8ml of A and B what about of water is this mixed to?
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Pergal. You can just use the 1:1 ab ratio to take it to whatever ec you want. I just used the nutrient calculator and it looks like 8ml/gal provides around 105 cal.

Here's the link to play around with

CannaStats - Nutrient Profiles for Cannabis

This page provides a common language spoken by all fertilizer solutions and a way to mix them for growing cannabis hydroponically. Sometimes referred to as the Lucas formula, this page explains the true origin of this well known proven formula and the project that led to its discovery. Emphasis...
www.angelfire.com
 
FatBoyVik

FatBoyVik

Well-Known Member
Thanks for the link. I think its going to take a couple reads to fully understand what's going on as it's quite detailed.
 
FatBoyVik

FatBoyVik

Well-Known Member
Situation is looking a little worse lads. Fed as described and lower cal slightly. Gave an foliar feed of cal mag (100ppm) yesterday.

I'm worried this has something to do with the lights since started LED I have had nothing but trouble and my temps get low which I have heard is a problem.

The blueberry pancakes is also struggling with something new. Like rusty looking growth.

Could this be a lock out or something?

Also does this look like something I can correct or should I start again?
 

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tumescent85

Member
What can we figure about this guys? Progressively worsening. 20240224_084744.jpg20240224_084755.jpg20240224_084441.jpg

Watermelon strain
About 45 days in to flower
Temps in 70s
Res temp mid 60s
Rh low 40s to mid 50s
12/12
LED bloom/veg 260w - 9-1100 ppfd
Advanced Nutrients- Bloom A / Bloom B -24ml
CalMag -24ml
Big Bud - 16ml
Carbo Load - 16ml
H2o2 - 10ml
3.5 gallons
Ppm I think 1200-1250
 
FatBoyVik

FatBoyVik

Well-Known Member
tumescent85 said:
What can we figure about this guys? Progressively worsening. View attachment 5372871View attachment 5372872View attachment 5372873

Watermelon strain
About 45 days in to flower
Temps in 70s
Res temp mid 60s
Rh low 40s to mid 50s
12/12
LED bloom/veg 260w - 9-1100 ppfd
Advanced Nutrients- Bloom A / Bloom B -24ml
CalMag -24ml
Big Bud - 16ml
Carbo Load - 16ml
H2o2 - 10ml
3.5 gallons
Ppm I think 1200-1250
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Looks serious, you should probably start a thread for that fella..
 
Billy the Mountain

Billy the Mountain

Well-Known Member
FatBoyVik said:
Any opinions on my plants possible issue? You seem great at diagnosing quickly
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I'd reduce the CalMg for starters. I'm not sure how you're determining that you're adding 200ppm of CalMg, but, if accurate, it's far too much.
GH recommends 5ml/gal as a full dose which amounts to 80ppm of Ca; you're providing 250% of that in addition to whatever Ca is present in the base nutes. Too much Ca antagonizes absorption of other nutrients.
 
FatBoyVik

FatBoyVik

Well-Known Member
Billy the Mountain said:
I'd reduce the CalMg for starters. I'm not sure how you're determining that you're adding 200ppm of CalMg, but, if accurate, it's far too much.
GH recommends 5ml/gal as a full dose which amounts to 80ppm of Ca; you're providing 250% of that in addition to whatever Ca is present in the base nutes. Too much Ca antagonizes absorption of other nutrients.
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OK great your the second guy stating that which helps.

I seem to have screwed up.. Essentially I am running RO water and Cana is said to be best with tap water, so I was adding the calmag to get it up to normal tap water levels EC.

People have suggested ppm of 200 being good for tap water which is how I got there. My water out the tap is 300ppm which is strong I belive.

So I continue to reduce and should I flush or something?
 
Billy the Mountain

Billy the Mountain

Well-Known Member
FatBoyVik said:
OK great your the second guy stating that which helps.

I seem to have screwed up.. Essentially I am running RO water and Cana is said to be best with tap water, so I was adding the calmag to get it up to normal tap water levels EC.

People have suggested ppm of 200 being good for tap water which is how I got there. My water out the tap is 300ppm which is strong I belive.

So I continue to reduce and should I flush or something?
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Yet another reason to stick with EC when talking about nutrient concentrations. The 'ppm' number derived from the EC is not elemental ppm unless you're measuring sodium chloride (0.5 scale) or potassium chloride (0.7 scale). The meter measures conductivity, nothing more, despite what the display may indicate. For example, 5ml/G of GH CalMg (a max dose) per gallon of RO water will result in an EC around 0.8 with 80ppm Ca, 25ppm Mg, and 13 ppm N; cumulatively, barely a quarter of what a "ppm" meter would display for the same solution.

I've never used Cana nutes so can't help with that.
 
FatBoyVik

FatBoyVik

Well-Known Member
Billy the Mountain said:
Yet another reason to stick with EC when talking about nutrient concentrations. The 'ppm' number derived from the EC is not elemental ppm unless you're measuring sodium chloride (0.5 scale) or potassium chloride (0.7 scale). The meter measures conductivity, nothing more, despite what the display may indicate. For example, 5ml/G of GH CalMg (a max dose) per gallon of RO water will result in an EC around 0.8 with 80ppm Ca, 25ppm Mg, and 13 ppm N; cumulatively, barely a quarter of what a "ppm" meter would display for the same solution.

I've never used Cana nutes so can't help with that.
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Thank you very much, that's good stuff I'll stick to EC from now
 
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