Need help not sure what is happening

[alfonso2002]

--------------------------------------------------------------------------------

1. Are you growing from seed or clones? clones
2. How old are your plants? 20 days
3. How tall are your plants? 16"
4. What type of hydro system are you using? aro sprayers
5. What brand/type of nutrients are you using?fox farm line
6. What is the Ph of your nutrient solution?5.8
7. What is the PPM/EC of your tap water? 0
8. What is the PPM/EC of your nutrient solution?900
9. What is the temperature of your nutrient solution? 68 it was higher
10. Does your PPM/EC show a rise or fall when you do your daily PPM check?no
11. Does your pH show a rise or fall when you do your daily check?no
12. Do you foliar feed or spray your plants with anything?no
13. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights")400 MH
14. How close are your lights to the plants? 18"
15. What size is your grow space in square feet?36
16. What is the temperature and humidity in your grow space?74lights on 65 off
17. Have you noticed any insect activity in your grow space?no
18. How much experience do you have growing? little in aro

I started these plants in the aro tub 18 days ago the water temps were at about 76 All was looking good roots were all white now they are dark brown plants still look good but not sure on the brown on the roots Is it the nutes that are doing it

alfonso2002 Reviewed by alfonso2002 on 12-08-2010. Need help not sure what is happening -------------------------------------------------------------------------------- 1. Are you growing from seed or clones? clones 2. How old are your plants? 20 days 3. How tall are your plants? 16" 4. What type of hydro system are you using? aro sprayers 5. What brand/type of nutrients are you using?fox farm line 6. What is the Ph of your nutrient solution?5.8 7. What is the PPM/EC of your tap water? 0 8. What is the PPM/EC of your nutrient solution?900 Rating: 5

[tinytoon]

Are the roots slimey at all?? If not it is most likely nute stain. I know you lis FF as nutes but what all do you have in your mix?? I use GH line and as soon as I add Florishious Plus it does the same thing. If it is stained a touch of H2O2 will clean them right up but dont overdo as H2O2 can also kill to much beneficial bateria also :thumbsup:

[alfonso2002]

Tinytoon I am usingthe fox farm schedule here http://www.foxfarmfertilizer.com/Fox...l-Schedule.pdf
I did add H2O2 at the rate of 3% 5 oz to my 11 gal res today the roots are white again so I think it did the trick.How will I know if I Killed too much benefical bacteria? Thanks for your input on this problem. PS are you doing aro? I have another ? this is my first try at aro so am really green at this.
but the roots are all ready at the water level is it ok for them to be in the water? Thanks again.

[tinytoon]

Since you didnt use a shitload of H2O2 you should be fine with bacteria. As for the aro I'm sorry I have never done that. I know I have seen peeps talk about it but cant remember who it was.

[oldmac]

I do aero and aero/fog, with great results.

As Tiny pointed out, it could be just stained from nutes or additives.

I would not use H2O2, hydrogen peroxide, not because of "beneifcal bacteria", which is not needed in aero or aero/fog but because it is not compatible with some nutrient lines.

Look for a product that is chloramine based, it has all the pathogen killing power of hydrogen peroxide, but is much safer for the plant and won't screw with the nutrients.

Dutch Master's product called "Zone" is such a product.

OM

[MimbresValley]

I like Sm90 at 5 mil per gallon I swear by the stuff', hydrofungicide is also supposed to be amazing, I have not used it yet, but will be doing so the next round. was this your first time adding nutrients and the roots turned that color, or had you been adding nutrients, but then the color just developed?

[alfonso2002]

started when I added nuts

[oldmac]

Hey alfonso2002,

If that's the case, happened with the start of nutes, it is very possible that you hurt the roots with too much nutrient.

Aeroponics only requires abt 40% of the nutes mfg's recomended amount. And if at all possible I would start out at abt 20% concentration. ie: use the amount of nutrient you would for 1 gallon of water, but add 5 gallons of water instead.

Just looked over your trouble form again, and realized you have a TDS meter. 900PPM is too high, not the worst I've seen someone try but it's too high.
Probably abt 600PPM is the most you'll ever need and a starting point would be 300-400PPM.

The only other thing I noticed was your PH is just a little hi, shoot for 5.5 or so.

Good luck, keep us posted.:thumbsup:
OM

[alfonso2002]

Thanks oldmac will do a little adjustments to my water.

[tinytoon]

Thanks OM for jumping in :thumbsup: