3 week old plant showing yellow on leaves!

[Guest]

ok guys i got 1 c99 to germinate out of 5. was very dissappointed but my 3 week old plant is doing well upto a couple days ago. my leaves tips and some of the sides are turning a little yellow . I run a 150 hps in a cabinet. The hydro is a waterfarm drip system. I checked my ppm which is about 549 ppm. using the lucas formula . my temp stays about 71 about night and sometimes 83 in the day, but it is always about 80-79 degrees. could it be lack of oxygen. last week i didnt realize but my ppm was about 230, could this be causing it? thnks

 

[Guest]

please anybody could help me

 

[sproutco]

What is your ph? Got a picture? You said drip system. How often are you irrigating?

 

[Guest]

dont know what ph is, i know the water was 7 before the chemicals. what should the ph be and does irragating is that changing the rez? i do it once a week. she is being watered 6 times a day, evey 3 hours.

 

[Guest]

well i justed tested the ph it was 7.1

 

[mexicanmafia]

for hydro... your ph should be 5.5-6.0. i think that 7.1 is too high! you should get some ph down from your hydro store. also... i'm not sure but you sould water(irrigate) a lil more often than every 3 hours me thinks? i use dwc so i'm not sure on drip watering cycles. well good luck! hope this helps?

peace!

mm

 

[sproutco]

Start by lowering your ph to around 6 after the fertilizer chemicals have been added. Here's a thread on what you might use: http://www.icmag.com/ic/showthread.php?t=31294&highlight=sulfuric+acid

 

[Guest]

wow i did not know that. thank you guys so much!

 

[Guest]

ok guys i lowered my ph to 6. my question is the bottom leaves are a little crispy yellow prob becuase of the high ph, is it ok for me to cut them off? or wait?

 

[420KushMaster]

hey dude you can cut them off no worries.

 

[Guest]

well i beginning to think my nute level is too high. some of my newer leaves are turning yellow is 560 ppm too much for a 3 week old plant? thanks

 

[sproutco]

If your nutrients were too strong you would get burn along the margins and tips of the leaves. I think 400 ppm for a 3 week old plant should be plenty. New growth being yellow usually indicates high ph.

 

[Guest]

oh man i just realize i meant to say the tips of the leaves are getting yellow!! not the whole leaf, so my ppm is too high?

 

[sproutco]

Mynamestitch lists small plants 400-800 ppm. Concentrate on getting your ph at about 6 after the nutrients are added.

 

[Guest]

my ppm is at 430 now and ph is 5.6. is this ok?

 

[sproutco]

I think your plants would be much happier at ph 6 rather than 5.6 (this could start a debate with other growers that read this) Here's the ph chart for hydro: http://www.icmag.com/gallery/data/500/91934936ph-nutrient_chart.JPG

 

[70s_PotHead]

I think your plants would be much happier at ph 6 rather than 5.6 (this could start a debate with other growers that read this) Here's the ph chart for hydro: http://www.icmag.com/gallery/data/500/91934936ph-nutrient_chart.JPG

I was going to say the same thing sproutco, you beat me to it I think his ppm is too low also, i'm at 800 right now at 2 weeks and all is good



70s

 

[Guest]

well my leave tips are yellowing and deing out. my ppm was at 690!! too much i say, so ph of 5.6 bad? guess i will be getting some ph up stuff...

 

[70s_PotHead]

So far today you have said your ppm was 430, 560 and 690 so which is it?? Now remember adding ph up or down will effect your actual ppm. Maybe you should dump your rez and start over, adjust your nute strenght to about 500 then adjust your PH to 6.0 and see what happens. It would be much easier to help if you could post a pic of your plant

70s

 

[Guest]

well i thought it was 560 but it was really 690. then i changed my rez water again to 430, but thanks for all your help. i will try and get pics tommorrow.