yellow spots and leaf die back

[Leafmold]

Hello all'
I have posted a question on similar before on my first grow. This is a new grow and seems to be happening again. The plant is in a cab 20deep x 40 wide x 48 tall (Measurements in inches), using 200w cfl, the distance from the plant is 10 inches, the cab Temp is 80 degrees. Have an extractor fan through a carbon filter, n a fan circulating the cab air.
The plant is in 3/4 litre pot, it is not root bound, and they are being lightly fed n watered.
I hope some one can come up with an answer or at least point me in the right direction.
As an aside the problem with the other plants has not stopped the plant from flowering, not huge buds but i know i am on a big learning curve to get things right.
One pic of the new prob, n one of the bud on the old plant.
i appreciate any ideas and help you might be able to give.
Health n Peace

 

[WeedChuck]

3/4 liter pot and not root bound? If you say so. What are you feeding them? more info on your grow would help. cant figure out too much about your prob with mostly cab design.

 

[Leafmold]

Hi,
It is being fed on a general flowering feed,not anything else. watered when they are dry. Its a foot tall, I had a look at the root ball and it is not root bound, just seeing the roots.
Hope that is of some use, thanks for taking a look.

 

[TEERCSIdbREEDER]

Hi,
It is being fed on a general flowering feed,not anything else. watered when they are dry. Its a foot tall, I had a look at the root ball and it is not root bound, just seeing the roots.
Hope that is of some use, thanks for taking a look.

ok so its in a 3/4 liter container...its being fed flowering feed so im guessing its flowering...and your just seeing the roots now? these plants anchor their roots, you would have seen these a loooong time ago (unless you just transplanted from like solo cups or something)

good luck finding your answer

 

[WeedChuck]

not trying to be a hard ass, but when you say a "general flowering feed" To me that could be some .99 cent store low quality high salt fert or some top of the line hydro/soil fert. Im still trying to get over the 3/4 liter pot. only25 0z? what stage etc.I mean if you want help you need to be a little less vague.


read here http://www.icmag.com/ic/showthread.php?t=11688

 

[hazy]

Looks like a salt/nute buildup. Flush and hit them up with light bloom nutes only.
Too much salts will lower the pH and make them suck up too many nutes and then they can't take up water correctly and lock out some things, etc. it's bad.

 

[Leafmold]

That actually looks very familiar to me, do the leaves feel really thin and papery when you touch them?

Hi,
Yes they do feel thin n papery, n they turn brown eventualy. I take them off as i find them.

 

[Leafmold]

Looks like a salt/nute buildup. Flush and hit them up with light bloom nutes only.
Too much salts will lower the pH and make them suck up too many nutes and then they can't take up water correctly and lock out some things, etc. it's bad.

Hi,
I have not fed them in 5 days and have been flushing them with water, n a very weak flowering nut, they do look a little better. The buds are still growing n putting out new growth.
Thanks for the help,

 

[Leafmold]

Hi,
Thanks to you all for your help n advice it is most apreiciated. This is my first grow, n i will be paying far more attention to detail on the next one. I have learned a lot from all your comments.
Thanks again, Health n Peace,

 

[rocksteady]

god tråd