3rd time is not a charm. Yellowing of new growth. K problem?

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Efbespn

Member
Third try at this, went super conservative on this one. Yet the yellow seems to show up, no fail not sure what to do.
Here's the setup
Lights : Electric Sky es300 (300watt LED) dimmed at 30%
Medium : mix of Fox farms Ocean forest and Happy FROG and perlite.
Nute: Humboldt secret base A&B
CALMAG and Iron
Real growers recharge
Impello Tribus Microbes
RO water supplemented with 4ml per gallon of cal mag and iron.
Foliar sprayed with Epsom salt 1/4 tsp per liter.
Ph at 6.4
Havent yet gave them nutes as the fox farm soil is still fresh from a recent transplant from solo cups to 1/2 gallon pots.

Room Temps at 82 RH at 70-80%

Need some help from the experts. Been digging through old post in all forums but can never get a definitive answer as to what is going on. Signs point to a POTASSIUM problem. I'm sure I'm not the only one who has run into this problem, I'd appreciate if someone who could share their expertise in finding a remedy. Thank you loads and good luck to you all on your grows. All the best!
 

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Nutty sKunK

Nutty sKunK

Well-Known Member
Potassium affects the older leaves. That looks like a sulphur problem.

Either pH or no S.

Epsom salts are a good source of S.
 
Herb & Suds

Herb & Suds

Well-Known Member
Efbespn said:
Third try at this, went super conservative on this one. Yet the yellow seems to show up, no fail not sure what to do.
Here's the setup
Lights : Electric Sky es300 (300watt LED) dimmed at 30%
Medium : mix of Fox farms Ocean forest and Happy FROG and perlite.
Nute: Humboldt secret base A&B
CALMAG and Iron
Real growers recharge
Impello Tribus Microbes
RO water supplemented with 4ml per gallon of cal mag and iron.
Foliar sprayed with Epsom salt 1/4 tsp per liter.
Ph at 6.4
Havent yet gave them nutes as the fox farm soil is still fresh from a recent transplant from solo cups to 1/2 gallon pots.

Room Temps at 82 RH at 70-80%

Need some help from the experts. Been digging through old post in all forums but can never get a definitive answer as to what is going on. Signs point to a POTASSIUM problem. I'm sure I'm not the only one who has run into this problem, I'd appreciate if someone who could share their expertise in finding a remedy. Thank you loads and good luck to you all on your grows. All the best!
Click to expand...
By what method are you checking ph in soil?
 
Bernie420

Bernie420

Well-Known Member
Efbespn said:
Third try at this, went super conservative on this one. Yet the yellow seems to show up, no fail not sure what to do.
Here's the setup
Lights : Electric Sky es300 (300watt LED) dimmed at 30%
Medium : mix of Fox farms Ocean forest and Happy FROG and perlite.
Nute: Humboldt secret base A&B
CALMAG and Iron
Real growers recharge
Impello Tribus Microbes
RO water supplemented with 4ml per gallon of cal mag and iron.
Foliar sprayed with Epsom salt 1/4 tsp per liter.
Ph at 6.4
Havent yet gave them nutes as the fox farm soil is still fresh from a recent transplant from solo cups to 1/2 gallon pots.

Room Temps at 82 RH at 70-80%
Click to expand...

run the light at full power and raise or lower it to get the right light intensity.

FEED IT SOME NUTES AT 1/4 STRENGTH

leave it alone untill you need to water it again. Lift pots to check weight.
get the humidity in check.
 
Cx2H

Cx2H

Well-Known Member
My sheet used to do that inside in my rooms. Then I put the same (clones) strains outside feed them the same and they're photo op ready everytime. Never yellowed again. My outside light must of fixed it, it's a kajillion watt solar star.

Smoke good my friends
#UselessInfo
 
E

Efbespn

Member
JohnDee said:
Ef,
Your led...is that true 300 watts? If not...and you're only at 30% could be lack of light. It is on new growth. Could be you are double dosing Mg and locking out some other cation.
JD
Click to expand...
Screenshot_20200120-105540_Chrome.jpgScreenshot_20200120-105525_Chrome.jpg
I know I was wondering if I got too low of a percentage but wanted to rule out light burn as well. It's super difficult to get an exact answer on what is going on with the problematic plant. One guys says the lights at full power may be too much, the other says not enough. For anyone who is desperate to fix the ladies we try anything to remedy the problem, in doing so, In turn doing more harm than good. Will take your advice and bump it up to at least 50-70%,just to be safe for now. Apparently these lights are pretty strong.
 
E

Efbespn

Member
Cx2H said:
My sheet used to do that inside in my rooms. Then I put the same (clones) strains outside feed them the same and they're photo op ready everytime. Never yellowed again. My outside light must of fixed it, it's a kajillion watt solar star.

Smoke good my friends
#UselessInfo
Click to expand...
I hear you. Trying to make mothers, so outside is a no go. But her kids can go outside to play. I agree the outside light is so much better. Cheers!
 
E

Efbespn

Member
Bernie420 said:
run the light at full power and raise or lower it to get the right light intensity.

FEED IT SOME NUTES AT 1/4 STRENGTH

leave it alone untill you need to water it again. Lift pots to check weight.
get the humidity in check.
Click to expand...
Thank you loads for the recommendations. Will put them in effect. Got them in fox farm ocean soil, not sure I should feed them yet since it's been two weeks since I re potted them. Will update in a couple days with the watering.
 
JohnDee

JohnDee

Well-Known Member
Efbespn said:
View attachment 4460525View attachment 4460524
I know I was wondering if I got too low of a percentage but wanted to rule out light burn as well. It's super difficult to get an exact answer on what is going on with the problematic plant. One guys says the lights at full power may be too much, the other says not enough. For anyone who is desperate to fix the ladies we try anything to remedy the problem, in doing so, In turn doing more harm than good. Will take your advice and bump it up to at least 50-70%,just to be safe for now. Apparently these lights are pretty strong.
Click to expand...
Looks like a true 300w light. II'm not an led expert...but it should do the job. Someone suggested varying distance rather then dimming.
Calculate your watts per square foot...should be around 30 for leds.
JD
 
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