New Grower in 8th week. Having problems

Grow Cycle
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Environment:
3 gallon bags
Coco cor
Feed is Calmag and General Hydroponics (micro, gro, bloom)
4 x 2 x 5 grow tent
Humidifier
Large standing fan and rotating fan
Sour Diesel Autoflowers
Feeding 3ml Calmag, 4ml GH Micro and 8ml GH Bloom
In 8th Week of grow.

PPM between 650-750
Temp average 81-85 F
PH of Water - 6.3
PH of runoff - 5.5-6.0
Humidity 55% to 70%

Hello all I am in great need of advice on my grow. The plants are in their 8th week and for the past 2 weeks I have been struggling. The previous 6 weeks have gone very well with very minimal issues. These last 2 weeks I have seen a great increase in yellowing and dying leaves. Brown spots over my plants and burn curling tips.

Trying to battle these nutrient issues I have flushed them for the past 7 days. Before that I tried adding wormcastings to coco to gain more nitrogen and epson to increase magnesium. Neither of those worked so went on a full flush for the past week.

However the issues persist so I am at a loss and need some advice. I have purchased a new tent to to increase the space 5x3x7 but dont have the proper lighting as my light is made for a 4x2 space. Please take a look at the pic any advice would be greatly appreciated. Thank you

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1 Like
2

Flushing them for a week with no food is giving you more problems in my opinion. I would just go back to normal feedings and let them ride it out to finish.

1 Like
3

How often were you feeding, and what was ppm of tap prior to nutrients? You were probably just a little low on mobile nutrients and a little high on your ph in.

4

Thank you for responding. PPM of the tap was about 450 and I was definitely watering to much I was giving them water every night not waiting for the soil to dry. So I have decreased that now to about 1 every 36 hours or so.

5

Im new…but isnt coco coir suppost to be lower pH than soil? I do pH 6.0-6.8 for soil and I know coco should be lower from the zillion vids ive seen. :pray::v:

6

From my research coco coir should use a PH of 6 to 6.5. Found an issue with my ppm meter. Looks like I am seeing a 900 ppm on my feed solution and 1500 on my runoff…

7

My first observation is that you have no exhaust or intake. Just fans inside the tent recirculating the air.

Is this correct?

8

no I have a 8mm exhaust filter hooked up with. Set on high. You can see it in second to last pic