Hi,
Any thoughts on what’s going on with my 9 week old Northern Lights based on these photos?
Grow environment:
- 200 W LED light (Aerowing light from Vivosun)
- 20 hour light on, 4 hour off (still in vegetative stage)
- 5 gallon cloth pots with Happy Frog soil
- ventilated tent with automatic exhaust and circulation fans set to:
78 degrees, 65% humidity for light period
66 degrees, 68% humidity for dark period
- watering: 8 cups per plant every other day
- fertilizer: Stage 2 Growtime fertilizer (N-19 P-5, K-20) 1 time per week (4 cups per plant mixed at recommended dosage - .75g/L)
Thanks in advance!
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Cal mag deficient and overwatering is my guess.
Overwatering is frequency based not amount at 1 time. 8 cups at 9 weeks in 5 gallons of soil is no where near enough. Need to get run off using synthetic nutes to wash out the salt build up.
I would be running as much water as needed to get 15-20% run off, discard that immediatley so she doesn’t wick the salt back up. Wait for her to dry out completely and flood her again. I would think this would be about every 3-4 days but watering is not on a schedule. What is you pH?
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thanks for the reply! It sounds like I’ve been watering incorrectly. I’ve just been running an automatic pump every other day for a certain time to deliver a set amount. I’ll switch it up and run enough water through to get some runoff - 15-20% of what I put in.
I’m not sure what the ph is. I just ordered a ph meter and will check it the next time I water and post back here.
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The way you have been watering would be great for coco. I just switched from soil to coco on this grow and I am running 3 gallons through her every other day. I never thought a plant in a 7 gal pot could be so light after 24 hours and 3 gal. Same size pot and Ocean Forest, I would run a gallon or so about every 4-5 days. Here is the beast drinking 3 gallons at a time
Cheers Brother.
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Interesting. Should I use nutrients every time?
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Happy frog is good for 4 weeks. After that yes, you should feed to maintain 1000 ppms for the rest of the grow.
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I ran a gallon of water mixed with nutrients (N-19 P-5, K-20 - mixed at .75 gr per liter as recommended on package) through each plant and ended up with about 3 cups of runoff for each plant.
The pH of the water/nutrient solution going in was 7.3. The pH of the runoff was 5.9 for one plant, and 6.3 for the other.
Should I be raising the pH of the input solution to get the runoff pH higher?
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This what I do. But I think I would wait now that you got a good run off and when you water again, go in at the 7.3 and test that run off. She might correct herself now that you are watering her the way she wants. There could have been salt build up that was tanking your pH.
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I’ve got some pH up solution on the way. Thanks again for all the help!
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