White Widow Spotting problem

[kaze]

I still have an issue with my White Widow. Here is a little history of the issue and a few pics of what I am seeing.

Germinated 9 plants 3 white widows. The others where the "bonus seed" from the seed bank...I hope its good because this round looks like it will only be "bonus seed.

Germination using the towel method.

One of the three looked brown and burnt as soon as its first leaves showed. I let it grow just to see. Now the other two plants soon showed signs on the bottom leaves and now the larger one is showing the same on the next set of leaves moving up the plant.

Here is the odd thing. The "Bonus seeds" show no issue at all.

I am using a drip more like a flow method / Deep Water system. The plants are in rockwool / hydroton cups.

One the WW has grown roots into the nutrients and one has not. The one in the Nutrients is showing the issue on the next set of leaves.

I thought heat stress and made adjustments with another fan and adding a humidifier..

I also thought mico Nutrient issue from some research and changed the water in the system.

Stats on system

ph 5.8
temp 67-78 night to day
Humidity 45%
CWF lighting
Nutrients 630 ppm
Nutrients :GH Flora Series Liquid Concentrate 3 part system

Any Ideas

Did I do something during germination????

 

[smokeybandit22]

how old are they? they look a little young for 600 ppm's. also Gh series known for salt build ups. have you flushed the res? temp of res?

 

[kaze]

THe plants are abut 20 days from seed. I just flushed and changed the res 2 days ago and bumped the nuites at that time to the 1-1-1 mixture...

The temp is running about 60-70 F in the Res....

Just weird that the other plants are doing great just the WW is having issues...

COuld it be a Ca or Mg issue?

 

[smokeybandit22]

prob not considering that they are from seed and their age. if from clones, maybe. I'm suprised they are not more burnt from those levels of nutes. If you are using tap, there should be plenty of mg and ca in there. I would just back those ppm's down to 200-300 tops. They really dont need as much as one would think, especially when grown in hydro.
not likely heat stress with the CFL's. Obviously the humidity can come up a but if possible.

 

[kaze]

prob not considering that they are from seed and their age. if from clones, maybe. I'm suprised they are not more burnt from those levels of nutes. If you are using tap, there should be plenty of mg and ca in there. I would just back those ppm's down to 200-300 tops. They really dont need as much as one would think, especially when grown in hydro.
not likely heat stress with the CFL's. Obviously the humidity can come up a but if possible.

I will back it back down to 300 by adding some H2O... I have been using DI water to start but I filled like 10 gallon jugs last night of Tap so I will check the ppm and pH and this and back the ppm back down to 300 or so..

At what age should I boost the Nuites???

Thanks

 

[smokeybandit22]

dwc has gotta be the best and quickest. but the plants are much more sensitive than soil or others forms of hydro. much more sensitive to changes and environmental stressors.
at 300 ppm that is prob gonna be enough nutes to last couple of weeks. just make sure your tap is not over 150 ppm's or so or it may be too hard.
general-
1-3 weeks-tap water
3-4 weeks 300-500 ppm-with 50 ppm of bloom
4-6 weeks 400-600 ppm with 100 ppm of bloom and continue until flower
flower-hit me up when u get there

kick that humidifier up a like 20%-indoor hydro mostly likes around 60-75%
be careful with the h202-some swear by it and some swear against it-just understand that it will kill off all bacteria-good and bad-which is usually not he best thing-if you can pick up some hydroguard that would be wise in order to keep the res/root zone balanced
with dwc, minor, minor changes at any one time
make sure you air out the res for the root zone or wherever they are sitting 2 x times a day to get some good air flow-roots need the extra bit of o2 and help disperse many of the by product gases