what are the brown spots on leaaves

[dougefresh]

I don't have.good pictures but on my slightly yellow leaves (prob nut deficiency) there are these little brown spots, what are these from? Please help..and can anything else cause yellowing of leaves

[HateHeaven]

you may need nutes, or you could be frying them with nutes. How old are they? Whats your medium? Have you given any nutes? :jointsmile:

[keeko]

yes, more info would be nice

[HateHeaven]

Also, check this out
Grow Marijuana FAQ, Cannabis cultivation - marijuana growing tips & photos (http://www.tokecity.com/forums/faq/growfaq/97.html)

[dougefresh]

Heres details

Plants age: 3.5 weeks
nuts( I prob made a mistake because the leaves were yellow) but
they are on a full dosage because when I have half they were turning yellow) i don't know the ppms

Growing medium: rockwool and hydroton..(the rockwool has a little algae on it cuz I didnt cover it good enough)

Humitdy: 35%
Temp: 78 degrees

[stinkyattic]

Gotta get a pic, or fill out the troubleshooting form, or both.
Did you pre-soak your medium so that it would be at correct pH? Neither RW nor hydroton come from the factory at proper pH for cannabis. Kinda sounds like K or Ca deficiency.

[dougefresh]

Why kind of nutrient solution should I buy..what would you recomend...so brown spots on leaves means k or ca deficiency?

[dougefresh]

I was just reading on the nutrients page, that I could have calcium lock out, due to changing the PH to much? and whats an easy way to fix calcium deficiancy?