PH of runoff 6.7 in coco but the feed is 5.6???

At my production grow my runoff ph is usually above 6.5, tonight it was 6.7. The feed is 5.6. The EC of the feed is 2.8 and the runoff is 3.8. If the nutrients build up in the coco shouldn't the PH lower, not raise? I don't care about the EC building up, that's sort of the idea with crop steering. I know guys that run big rooms and feed at 3.0 with the goal of a 6.0 medium EC. Just don't understand the PH tho..

Chemical reactions will increase the ph and therefore alter the ph of your runoff.

NO3 causes the plant to raise the pH in the rhizosphere. With that high of EC there is alot of NO3 ions being taken up. My output pH is same as yours. I dont worry about it. Adding a little NH4 would help lower it if you think its necessary. I will keep quiet about the EC.

Roguedawg said:

NO3 causes the plant to raise the pH in the rhizosphere. With that high of EC there is alot of NO3 ions being taken up. My output pH is same as yours. I dont worry about it. Adding a little NH4 would help lower it if you think its necessary. I will keep quiet about the EC.

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Yeah my calcium nitrate has barely any nh4.

nxsov180db said:

At my production grow my runoff ph is usually above 6.5, tonight it was 6.7. The feed is 5.6. The EC of the feed is 2.8 and the runoff is 3.8. If the nutrients build up in the coco shouldn't the PH lower, not raise? I don't care about the EC building up, that's sort of the idea with crop steering. I know guys that run big rooms and feed at 3.0 with the goal of a 6.0 medium EC. Just don't understand the PH tho..

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How do your plants look with feeding at 2.8 and run off at 3.8? And what's your npk ratio?
It's difficult to believe that they would not be getting locked out with such a high EC. But I've heard that it can be done when done right. You don't run like that for all of flower right? With crop steering you push it up and then back it right down and I think how much dry back they get is a big part of this method too right?

Kola_Kreator said:

How do your plants look with feeding at 2.8 and run off at 3.8? And what's your npk ratio?
It's difficult to believe that they would not be getting locked out with such a high EC. But I've heard that it can be done when done right. You don't run like that for all of flower right? With crop steering you push it up and then back it right down and I think how much dry back they get is a big part of this method too right?

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It's a gassed room with 900+ppfd, there's some guys trying to push a 10ec in the medium during the stretch, like the minimum they feed is 3.0 lol.

There is also literally TONS of trash weed getting grown by commercial grows doing things like that. Just because you can afford a big grow room doesn't make you a good grower or mean you grow good quality weed.

Thundercat said:

There is also literally TONS of trash weed getting grown by commercial grows doing things like that. Just because you can afford a big grow room doesn't make you a good grower or mean you grow good quality weed.

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Agreed.

Do you have any pics?

Thanks

10 mS/cm is getting into the salinity of sea water. There are only sea grass and mangroves that survive there.

nxsov180db said:

It's a gassed room with 900+ppfd, there's some guys trying to push a 10ec in the medium during the stretch, like the minimum they feed is 3.0 lol.

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They probably be using Athena with those cardboard terps. All kidding aside it will depend on what nutrients you’re using. 3.0 with Mega Crop is very hot

SofaKingHigh_ said:

They probably be using Athena with those cardboard terps. All kidding aside it will depend on what nutrients you’re using. 3.0 with Mega Crop is very hot

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Most people are, I know nutrients pretty well, I make my own, Athena seems to be dead on with the ratio's along with the new jacks 0-12-26. If mega crop was too hot the ratio is probably off, just like hot using maxi bloom at 3.0 would give a P toxicity because it has too much, so it limits you.

nxsov180db said:

Most people are, I know nutrients pretty well, I make my own, Athena seems to be dead on with the ratio's along with the new jacks 0-12-26. If mega crop was too hot the ratio is probably off, just like hot using maxi bloom at 3.0 would give a P toxicity because it has too much, so it limits you.

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I’m not an Athena fan boy, but I also don’t like large scale production companies that only want to produce as much cannabis for as little cost as possible. I’m into growing the best quality cannabis humans can grow and that’s not happening at scale at a production facility. So just because that’s what they use doesn’t mean that’s what I want to use. Mega Crop is great stuff and less is more. Why push crazy high ec ? Oh that’s right because they are looking for efficiency not best quality. Sorry for the rant but the best cannabis is homegrown.

Lou66 said:

10 mS/cm is getting into the salinity of sea water. There are only sea grass and mangroves that survive there.

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I have a cut that hasn’t got any runoff for at least three weeks. Feeding with jacks 4/2 @ 3 ec. Runoff wouldn’t even register on my meter and it goes to 10ec! Plant looks great, has some slight burn but otherwise unaffected. Smells great and has pretty good trich development for 31 days. Stacking ec in the media is a great way to illicit desired responses in the plant. Especially during stretch.

I have never checked run off-
I have never checked ec or ppm
I follow the instructions on the nutrients- no extra
Supplement with kelp/humic acid throughout and blackstrap in early flower
Pay attention to the plants and give them a good environment
I am lucky that my water source is under 40 ppm which I tested at the beginning
I don’t like micromanaging every little thing- gets you in trouble chasing your tail
I have always had a bit of a green thumb
This pic is white widow at exactly 5 weeks from flip

Any new people reading this dont use these extreme EC #s. Start around 1.2 and go from there. Plants can look real good at these high numbers then look real bad real quick. If you are multi feeding you are replenishing the pool every few hours, they dont need 3 EC every few hours. When you get enough experience to start steering through the stretch there are better ways than an extreme EC in coco.

Roguedawg said:

Any new people reading this dont use these extreme EC #s. Start around 1.2 and go from there. Plants can look real good at these high numbers then look real bad real quick. If you are multi feeding you are replenishing the pool every few hours, they dont need 3 EC every few hours. When you get enough experience to start steering through the stretch there are better ways than an extreme EC in coco.

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Just to be clear, I’m not encouraging people to run high ec. I’ve been down the low ec road, it’s where I started. 8-900 ppms used to be as high as I would go. Had a few decent grows, but was always chasing deficiencies and never made any leeway. I’ve never had healthier plants now that I feed higher ec, but what works for me might not work for someone else. I have lower temps and run 7-800ppfd just in veg, so higher ec is what my plants require. A warmer drier climate would require lower ec as to not burn the plants. My smoke is still smooth, flavorful and burns to a white ash.