Thirvnrob's Canuck Seeds Double Chocolate/Acapulco Gold Comparative Grow

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I noticed this yesterday. It’s only on this girl & mostly on or near the top. Anyone have any ideas?
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Looks like a calcium deficiency and that usually shows first on lower leaves (because it's a mobile element). If those are upper leaves and the leaf points are curling up it could be a result of light stress.
 
InTheShed said:
Looks like a calcium deficiency and that usually shows first on lower leaves (because it's a mobile element). If those are upper leaves and the leaf points are curling up it could be a result of light stress.
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Thanks. I’ll dial the light back a little bit.
 
InTheShed said:
Looks like a calcium deficiency and that usually shows first on lower leaves (because it's a mobile element). If those are upper leaves and the leaf points are curling up it could be a result of light stress.
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I may have had an aha moment. This is the only girl in a 5 gallon SIP - the other three are in 10 gallon SIPs. Maybe a 5 gallon container won’t support the growth she’s exhibiting through veg, especially in a SIP. The girls in ten gallon containers are all happy…
 
Is it big enough to have run out of food already? I don't know how long a 5g LOS grow should last, but it the whole SIP is 5 gallons then there's less than 5 gallons of soil, yes? :hmmmm:
 
InTheShed said:
Is it big enough to have run out of food already? I don't know how long a 5g LOS grow should last, but it the whole SIP is 5 gallons then there's less than 5 gallons of soil, yes? :hmmmm:
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I have 20ltr SIP's that hold about 6 ltrs of water and they drink an easy 3ltrs a day so you are probably onto it
 
InTheShed said:
Is it big enough to have run out of food already? I don't know how long a 5g LOS grow should last, but it the whole SIP is 5 gallons then there's less than 5 gallons of soil, yes? :hmmmm:
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Correct.
 
Absorber said:
I have 20ltr SIP's that hold about 6 ltrs of water and they drink an easy 3ltrs a day so you are probably onto it
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She & her sister will take 4 liters per day, but I’m hesitant to give them that every day because some of the leaves are clawing also, so I give them 5-6 liters every other day with 5 ml of cal/mag per gallon of water
 
Thirvnrob said:
She & her sister will take 4 liters per day, but I’m hesitant to give them that every day because some of the leaves are clawing
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Do you mean you think there is too much N baked into the soil?
 
You said you noticed clawing and this is an organic grow, so the only source of nitrogen would be cooked into the soil.
 
Thirvnrob said:
Maybe I should top dress with bat guano?
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Now I'm confused! That would add more nitrogen, but I thought you were trying to slow down the N uptake because you saw some clawing on the leaves.
 
T…looking forward to a scrog pic update. I’ve seen the same issue on previous grows, but with only nine completed I wait for the experienced growers to weigh in on issues and solutions. Cheers
 
InTheShed said:
Looks like a calcium deficiency and that usually shows first on lower leaves (because it's a mobile element). If those are upper leaves and the leaf points are curling up it could be a result of light stress.
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calcium is an immobile nutrient shed.
Thirvnrob said:
I noticed this yesterday. It’s only on this girl & mostly on or near the top. Anyone have any ideas?
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IMG_4231.jpeg
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This information should help you.

Plant Abuse Chart

Heat Stress : Look closely below, and you'll see the brown leaf edges that are indicative of heat stress. This damage looks alot like nutrient burn, except it occurs only at the tops of the plants closest to the lamps. There's only one cure for this...get the heat away from the plants, either...
www.420magazine.com
 
WakkaDerpin said:
calcium is an immobile nutrient shed.

This information should help you.

Plant Abuse Chart

Heat Stress : Look closely below, and you'll see the brown leaf edges that are indicative of heat stress. This damage looks alot like nutrient burn, except it occurs only at the tops of the plants closest to the lamps. There's only one cure for this...get the heat away from the plants, either...
www.420magazine.com
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Thanks Wakka!
 
WakkaDerpin said:
Deficiencies can also be confused with nutrient lockout as stated in the plant abuse chart. Goodluck @Thirvnrob
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Indeed, but with this being an LOS grow I was growing confused about Rob's comments about his watering practice and the clawing leaves. Either way, that looks like a Ca deficiency regardless of cause!


[And from what I can find, nitrogen doesn't lock out calcium.]
 
I’m sorry, scratch everything I said & let me start over. I saw the same spotting on a few of her sister’s leaves today and I’m certain they weren’t there yesterday. Then I remembered they’re both in the store bought soil I’m using to compare to my (The Rev’s) soil mix, so I looked at the bag & it says no amending necessary until the roots fill the soil, which they have clearly done. They recommend top dressing with their compost mix which I don’t have, but I can brew some compost tea. Interestingly enough, recipe is from the Rev’s book I got my soil. Whaddaya think? @Gee64 ?
 
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