B
borntaskate
- 17
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So I've been growing for about 15 years anywhere from from 4 light rooms to 100 light warehouses. I have always used RO water with great success. I recently changed over to a salt based mix and so far so good. I had my water tested at one of my grows so i could swap over and use tap water.
Currently i have a 12 light room using RO water with the salt mix in coco in 2 gal smart pots. All of these plants look great 3 weeks into bloom and no signs of N Toxicity. Then i have my other room which is 4in rockwool on slabs. While these plants were in veg I was using the same salt mix with RO water with no problems and put them in my flower room onto slabs and was watering with the same mix and RO water and everything looked great. I flipped the room into 12/12 and started using my tap water with the same mix as my levels of everything wasn't really that high ( see attached water results). About 4 days into flower I started seeing what looked to be nitrogen toxicity. Which was Leaf tips on some leaves clawing down at the tips with some bottom leaves going shiny. So i dialed back my calcium nitrate to dial back my N from (NO3-) 131ppm (NH4) 11ppm = 142 ppm Nitrogen to (NO3-) 115ppm (NH4) 11ppm = 126 ppm Nitrogen. People I know are running their Nitrogen as high as 150 with no adverse effects. When I dialed it back i did see some improvement but it has only been a couple days. Just curious if any experienced growers have any input about this maybe being caused by something in my tap water. Possibly sodium, chloride, or my alkalinity. I also changed my veg over to tap and my moms started showing the same thing. I drained my water tank and started filling with RO water to go back to what I was not having issue with. But I would like to try and figure out what the issue could be.
This is the current ppm numbers with my tap water. I'am also adding about 50 ml of PH down with a 0-21.5-0 of phosphoric acid which adds about 25 ppm of P.
Here is a picture of the plants in veg with RO + Salt mix.
The Plants a couple days into bloom
Currently i have a 12 light room using RO water with the salt mix in coco in 2 gal smart pots. All of these plants look great 3 weeks into bloom and no signs of N Toxicity. Then i have my other room which is 4in rockwool on slabs. While these plants were in veg I was using the same salt mix with RO water with no problems and put them in my flower room onto slabs and was watering with the same mix and RO water and everything looked great. I flipped the room into 12/12 and started using my tap water with the same mix as my levels of everything wasn't really that high ( see attached water results). About 4 days into flower I started seeing what looked to be nitrogen toxicity. Which was Leaf tips on some leaves clawing down at the tips with some bottom leaves going shiny. So i dialed back my calcium nitrate to dial back my N from (NO3-) 131ppm (NH4) 11ppm = 142 ppm Nitrogen to (NO3-) 115ppm (NH4) 11ppm = 126 ppm Nitrogen. People I know are running their Nitrogen as high as 150 with no adverse effects. When I dialed it back i did see some improvement but it has only been a couple days. Just curious if any experienced growers have any input about this maybe being caused by something in my tap water. Possibly sodium, chloride, or my alkalinity. I also changed my veg over to tap and my moms started showing the same thing. I drained my water tank and started filling with RO water to go back to what I was not having issue with. But I would like to try and figure out what the issue could be.
This is the current ppm numbers with my tap water. I'am also adding about 50 ml of PH down with a 0-21.5-0 of phosphoric acid which adds about 25 ppm of P.
Here is a picture of the plants in veg with RO + Salt mix.
The Plants a couple days into bloom
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