baxbax
Well-Known Member
Hi , I use 85 % phosphoric acid as ph down I feed plants with 5.5 and fix ph at 5.8 next day ph raise to + 6.5 . I'm searching for most stable ph down that can hold my ph for longest time possible in COCO -
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Phosphoric acid works fine and is pretty standard.
When you say -'next day ph raise to 6.5' are you talking about the runoff from the pot?
yes , I fix runoff to 5.8 next day runoff is like 6.9
How much calmag are you using?
Not sure how in coco but it looks like calcium lockout due to overfeeding? Too much nitrogen....likely. What stage are your girls in?
No, I wouldn't say you have lockout judging by the state of your plant, I would say that you are just low on calcium. Use the Cal Mag according to its instructions and you won't overdo it. Did you say that these were autos? Do you use foliar? You can spray cacium nitrate on your plants in a spray bottle diluted down after lights out if you are only looking to increase your calcium levels and not overdo it on magnesium.
Hmmm... well, many deficiencies are so complex that very few experienced people are willing to make firm statements about the causes such as you are making. Though that doesn't mean you're not right.
Most would say to get your ph and feeding routine in line first and the rest will follow.
But in any case- 1.5 ml of calmag seems much to low to me and in coco would cause deficiencies. I use 4-5 ml of (botanicare) calmag per gallon.
Coco is a calmag hog and plants grown in it will show rust spots like that if you don't use enough.
How much calmag does it say to use- on the bottle ?