Apparently Suddenly Clueless

Iricana

Member
Running a 2 bucket RDWC with a chiller. (I live where its hot even in winter). I cannot diagnose the problem here and would love some help or guidance. This is the 4th plant that has started to yellow. I have adjusted everything I can think of...Raising and lowering the light, light strength, Water temp, CalMag, Nutes but can never quite figure it out by week 5-7 where the plant looks awful and I pull it. Below is a pic and my current plant info.

Thank you so much for any assistance or guidance.

- Week: 3
- Nutes: TPS Nutrients
- PH: 6
- Water temp: 68F
- EC: .7
- Humidity: 65%
- Temp night: 70F, Night 65
- 4x4 grow tent
- Light: Spider Farmer
 

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Tolerance Break

Well-Known Member
Have you tried upping the feed, if so how much?

Do the failed plants all look similar to this, and if so, how does the affliction progress?
 

Iricana

Member
I have not significantly increased the feed. Most early weeks all call for similar amounts if you go by the TPS provided feed chart, so no significant increase in feed. Yes the failed plants all followed a similar process. I'd would say the new leaves look good for a few days as they mature then start to yellow slowly. It progresses as new leaves grow and older leaves get bigger then eventually drying out starting at the tips and moving inward.

BTW - my mistake this is week 2
 

Tolerance Break

Well-Known Member
I would say maybe up the feed, maybe some calmag.

I believe that is mobile nutrients leaving the old growth for the new growth, in this case magnesium possibly?

How often do you change the res, or do you just top off?
 

Iricana

Member
Have you tried upping the feed, if so how much?

Do the failed plants all look similar to this, and if so, how does the affliction progress?
I have not significantly increased the feed. Most early weeks all call for similar amounts if you go by the TPS provided feed chart, so no significant increase in feed. Yes the failed plants all followed a similar process. I'd would say the new leaves look good for a few days as they mature then start to yellow slowly. It progresses as new leaves grow and older leaves get bigger then eventually drying out starting at the tips and moving inward.

BTW - my mistake this is week 2
 

Iricana

Member
I would say maybe up the feed, maybe some calmag.

I believe that is mobile nutrients leaving the old growth for the new growth, in this case magnesium possibly?

How often do you change the res, or do you just top off?
Thank you. I will try some cal mag and upping the nutes. I change the res every week and pump out old and bring in new
 

coreywebster

Well-Known Member
Spider Farmer - SF-2000 running about 18 inch off the plants (2) running at 100% power /18/6 hour
Dim them or raise them and get your temps up to 80f , they will be happier and transpire better and uptake nutrients better.

A bit of calmag wouldn't hurt, but you've not said if your on RO or tap.
But they'll do better in a warmer environment with a bit less light

To me it's slow light burn, which affects the older leaves because they've been under the light longer.

I generally use mh for veg because then I can veg low 70s and I don't have to add a heater, but my flower tent was empty for a full clean this round and I did the final training under my LEDs, 600w bar lights, set on 25% , 80f, plants were very happy, which they weren't at mid 70s on previous attempts at vegging under LED
 

Lou66

Well-Known Member
You don't need that high temps when using LED. Lower temps (lower transpiration to be precise) can be compensated with higher EC. You have to test what works for your set up but 2,5 mS/cm is not unreasonable.
 

coreywebster

Well-Known Member
You don't need that high temps when using LED. Lower temps (lower transpiration to be precise) can be compensated with higher EC. You have to test what works for your set up but 2,5 mS/cm is not unreasonable.
I'll have to try that
 
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