Brown patches on leaves--Help

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RottyRzr

Well-Known Member
This is an 8 week old auto.
Its in a 5 gallon fabric smart pot.
Soil is ocean forest with 25% perlite.
Nutes for most of the grow have been technaflora recipe for success. I gave them masterblend 4-18-38, magnesium sulfate and calcium nitrate @ 2.4-1.2-2.4 grams last week.
Pictures Ive found seem to suggest phosphorus deficiency so I gave them a 1/3 strength PK 13/14 but that hasn't helped.
It doesn't seem to be rust because its not on the undersides of the leaves.
This is an indoor grow. I have another plant right beside it that the only difference is its in coco loco. It appears healthy.
Here are a couple pics.
 

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Tracker

Tracker

Well-Known Member
Looks like Calcium deficiency. If you supplement with Calmag, and it is Ca def, the leaves that already show deficiency will stay that way, but the new growth should not develop the same symptoms.

Are you using tap water, RO, rain? Are you measuring ppm and pH? Temps, RH? What are your lights?
 
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RottyRzr

Well-Known Member
Thanks for the reply Tracker.
I use well water. I do have to adjust the ph due to my water being acidic.
i have checked ppm and try to account for my well water being 155 ppm. I adjust my nutrient mix to about 6.4. Sometimes its a little higher. Maybe 6.5.
Temps in the tent range from low 70F's at night to 80-81F during the day.
Humidity 50-60%.
The light in my 4x2 tent is a Spider Farmer SF2000. Right now it's at 90% and 18 inches above the center colas. Thats it though. The tent is only 60" tall and the light is as high as I can get it.
I will add that this problem started with lower leaves and is now showing in the upper leaves. I looked at calcium deficiency and it said it affects the upper leaves only. Don't remember where I read that. Anyway, I have CalMag + so I'll give them a foliar spray.
Any other ideas?
 
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RottyRzr

Well-Known Member
roleth said:
^ how did it turn our did it fix it? In having the same issue on 1 of my 4 wk olds.
Click to expand...
Things turned out ok after a while. First, I had my well water tested. I used Jacks lab to do the testing for me and the results came back showing no calcium in my water. They recommended that I increase my nutrient strength for several days to see if that would fix the issue. I switched to Jacks Nutrients and ended up going a full week at 4-3-2 (Jacks 5-12-26, calcium nitrate, magnesium sulfate) and started seeing nice green leaves growing in. After showing improvement I dropped the strength back to their 3-2-1 schedule and fed 3X a day with runoff.
Are you growing in coco?
I did try using calmag before this and didnt see any improvement.
Im liking the Jacks nutrients so far and don't know if they are any better than masterblend but they worked. I have since started some Ethos genetics Candy Store seeds that are growing like mad using the Jacks at 3-2-1 right now. They are still in veg but I will up the nutes to Jacks recommended rate once they are flowering good with hopes to prevent the same issues. I don't remember off the top of my head right now but I think they recommend 3.79-2.54-.99 for the 3-2-1 schedule now.
I guess bottom line for me was getting my water tested and knowing what I am working with.
Good luck and let us know what you find.
 
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roleth

Member
Ok thx I gave her an extra boost of phosphorus with calmag and the next morning oom its on another leaf.
 
R

roleth

Member
roleth said:
Ok thx I gave her an extra boost of phosphorus with calmag and the next morning oom its on another leaf.
Click to expand...
RottyRzr said:
Things turned out ok after a while. First, I had my well water tested. I used Jacks lab to do the testing for me and the results came back showing no calcium in my water. They recommended that I increase my nutrient strength for several days to see if that would fix the issue. I switched to Jacks Nutrients and ended up going a full week at 4-3-2 (Jacks 5-12-26, calcium nitrate, magnesium sulfate) and started seeing nice green leaves growing in. After showing improvement I dropped the strength back to their 3-2-1 schedule and fed 3X a day with runoff.
Are you growing in coco?
I did try using calmag before this and didnt see any improvement.
Im liking the Jacks nutrients so far and don't know if they are any better than masterblend but they worked. I have since started some Ethos genetics Candy Store seeds that are growing like mad using the Jacks at 3-2-1 right now. They are still in veg but I will up the nutes to Jacks recommended rate once they are flowering good with hopes to prevent the same issues. I don't remember off the top of my head right now but I think they recommend 3.79-2.54-.99 for the 3-2-1 schedule now.
I guess bottom line for me was getting my water tested and knowing what I am working with.
Good luck and let us know what you find.
Click to expand...
I have a question. I jave a mars hydro ts 600 and a Sayhon 1200w. My girls are starting to flower so my question is what would be a good height for the lights.16354515301601861080030484736916.jpg
 

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