If youre gonna buy a PH meter invest in a good one or you will need to be buying calibration packs every month and they still wont be super accurate. A cheaper alternative, the one I use, is a ph test kit. General hydroponics have a very cheap one and its very accurate.
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1st) I do use the GH pH drops so this post is not against the drops.
It's faulty information to say "buy a good pH meter (or you will be calibrating every month.) All good pH meters have the ability to be calibrated and calibration monthly would be part of a good maintenance routine, assuring accuracy of the device. Calibrating frequently should be seen as part a good quality control program. At least you'd know your readings are accurate.
2nd) The plan't color is off and showing signs of poor watering practices. I would not expect a new grower to pick up on this immediately but I would expect a grower with some experience to pick up on it right away. I've not seen anyone mention that.
We'll start with what "over-watering" isn't.
Over-watering isn't providing the plant with too much water in single watering. You can actually push gallons of water through a grow media on watering day and "not over-water." All the extra water does is produce run-off. There's reasons not to do this, but its not because of over-watering.
Over-watering actually is watering too frequently and not allowing sufficient time for the soil to dry back. I see this in the OP's plant because of leaf color ( the green is dull almost a gray hue to it due to roots not getting enough oxygen.) The fan leaves that show damage show signs of sitting with wet roots. Wet soil is acidic in nature and doesn't allow proper nutrient uptake. These 2 things explain the plant's general shade of green not being "lush" like a truly healthy plant would and the leaf damage patterns showing on the fan leaves. The plant leaves also look swollen and they arch across the leaf with the tips pointing to the soil ... The plant is saying "help I am drowning."
This isn't saying that the other's suggestions are out to lunch ... They are viable and will help improve the grow. However, nothing will help improve the grow more than getting the watering/dry-back routine down. It's the one thing that will improve everything and actually make the biggest difference in this grow.
Water thoroughly when you do but don't water as frequently. Every 2 days is way too much for most plants. Every 3 days is still too frequent for many.
The strain is cookie gelato, I barely feed her in veg stage, I bought nutrient for the bloom only not knowing she would need more.
I used to water everyday and feeding every other day instead of water, then yellow leafs started to appear and I let her 2days without watering but it got worst, then it stopped when I increased the amount 1.7l instead of 1l
I'm using sensi bloom part a+b i put about 8ml in 2l, I alternate with big Budd another 8ml per 2l
I think it stopeed growing tall, last time I had to adjust lights was like a week ago
Thanks
This is a prime example of improper watering techniques. It's not the amount of nutrients. Its the frequency of watering. In this case, the OP was both over-watering (watering too frequently) and under-watering (not providing enough water per watering) at the same time earlier in the grow. Most plants in a decent potting soil mix and proper pot size will go 3-5 days between watering.
Do not try to "schedule" watering day. Let your plant set that schedule. If necessary to get the wet/dry cycle down ... purchase one of these:
P.S. The plant will finish. It will provide for a decent harvest of decent buds. The tips I have given will help this grow some ... but its real power will be seen when the suggestions are applied appropriately in the next grow from the very beginning.