White Widow: Plant turning yellow with brown spots

[randybishop]

Had stem rot and it seemed to recover. Then the lower leaves started turning yellow with brown spots and now the yellow leaves are moving up the plant. The plant is 5 weeks old, growing in DWC under LED light.

Thoughts?

 

[jondamon]

If your growing in DWC what is your bucket ppm?

What ppm did you set it to?

What ppm is it at now?

What pH are you using?


Are you bubbling air into your bucket?



J

 

[randybishop]

If your growing in DWC what is your bucket ppm?

What ppm did you set it to?
1000 before

What ppm is it at now?
911 now

What pH are you using?
5.7

Are you bubbling air into your bucket?
yes

J

Thanks for your reply jondamon!

 

[*BUDS]

Are you using peroxide to prevent brown roots ?

 

[randybishop]

Are you using peroxide to prevent brown roots ?

Using AquaSheild

Thanks for your reply Bud!

 

[jondamon]

Thanks for your reply jondamon!

As long as your roots are good and ppm's are decreasing in a 24 hour period in your bucket then you can proceed to increase nute strength.

Set your buckets ppm and test again in 24hours.

If ppm has decreased by more than 100ppm, next top up increase ppm of your bucket.

Another train of thought is whether you are supplementing adding Ca and Mg.

Led lights give notorious issues with Ca and Mg.

A dude called SLIPON enlightened me to this factoid. He grows with led.




J

 

[randybishop]

As long as your roots are good and ppm's are decreasing in a 24 hour period in your bucket then you can proceed to increase nute strength.

Set your buckets ppm and test again in 24hours.

If ppm has decreased by more than 100ppm, next top up increase ppm of your bucket.

Another train of thought is whether you are supplementing adding Ca and Mg.

Led lights give notorious issues with Ca and Mg.

A dude called SLIPON enlightened me to this factoid. He grows with led.

J

Thanks jondamon!
Are you saying that LED causes Ca and Mg deficiencies?

 

[jondamon]

Thanks jondamon!
Are you saying that LED causes Ca and Mg deficiencies?

That's exactly what I'm saying. (So I've been told by an LED grower)


J

 

[randybishop]

The PPM went UP 200 in 24 hours.
What does that mean?

 

[jondamon]

The PPM went UP 200 in 24 hours.
What does that mean?

It means your nutrient strength is too high when you set it.

Set your ppm around 150ppm lower than before.



J

 

[randybishop]

It means your nutrient strength is too high when you set it.

Set your ppm around 150ppm lower than before.
J

Great! Thank you jondamon!