Yellowing on lower leaves. Please help.

[basseswall]

This is a young plant in a deep water culture under a 250 watt hps light is a closet with great air flow. I have 3 other young plants that do not have this problem which is only on the lower leaves. any suggestions? thanks.

 

[basseswall]

This picture might be a little more helpful.

 

[nick88]

Whats your ph... ppm ... water temps/

 

[basseswall]

ph is 6.5

ppm is 900

water temp is about 75

 

[nick88]

ph is 6.5

ppm is 900

water temp is about 75

They look pretty good. You may want to drop the temps of your res and lower the ph to around 6.
Sorry bout delay in reply

 

[kwilli]

6.5 is a little high for dwc. Around 5.8 is optimal, but that doesn't look like your problem. I think your nutes are a bit to strong, the burning on the edge of the leaves looks like nute burn, but I'm not very good at addressing hydro problems so I could be wrong.

 

[nick88]

I guess a question i should have asked earlier, is are they all in same res or diff 1s? If they're are n the same, i would lower ph, and water temp. Then give it a cpl dys, if it doesnt get better or starts getting worse then lower your ppms.
What nutes are you running

 

[basseswall]

I have each plant in their own bucket and I'm using the General Hydroponics Flora series.

 

[nick88]

Try lowering ppm, ph and water temp see how she does.
I put frozen gal jugs of water in my res every day to keep temps cool, but i'm running 50 gal res with flood and drain. For yours you could add a frozen 20oz bottle. I ended up switching my dwc res to an old cooler and it works great. Keeps the water temps steady and even has a drain plug to drain for res changes.

 

[basseswall]

Thanks a lot. This is my first grow and I could use all the help I can get.

 

[HotShot7414]

6.0 is too high and now 5.8 would be too high since potassium is a tricky nutrient you may want to lower it to 5.5 cause it does look like you getting K def.

 

[nick88]

No prob, good luck and let us know how she does.