NEED HELP. 5 Weeks into Flower. Leaves turning yellow/purple

ShLUbY said:
well it makes a lot of sense to not pH anything when it comes out to the desired range lol
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I'm just pointing out most of our tap is the same. We tend to overdo things on this site which leads to problems. I've certainly done it all. I had all the meters. Felt like I was a chef making a 5 course meal when it was time to feed. Haha, at this point I use a base nute with a few amendments for root Heath and everything took off.
 
ShLUbY said:
he's growing in soil, but he's not doing an organic water only grow and relying on microorganisms and root exudates to determine his pH.

when you feed a plant already chelated nutrients, it decreases the amount of exudates it produces because it's a waste of energy since everything is already available in the solution.
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So you recommend i still test ph as well as continue on the nutrients im using?
 
Judo90 said:
So you recommend i still test ph as well as continue on the nutrients im using?
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definitely. your soil is slightly alkaline or at least too close to neutral because of the buffer. you have to drop acidity of the water to deliver at the proper pH range because the buffer in the mix. seeing problems in the most recent growth almost always correlates with improper pH range.

i would be shooting for 6.0-6.2.

if you've never looked at one, google soil pH availability of nutrients and click the images tab. you can see where 6.0-6.5 is the sweet spot. but your mediums pH is higher than that based on your runoff reading (though I hate that, it's accurate enough to assume).

the key things that are affected by this slight high pH are copper and zinc, which activate enzymes and function in respiration, as well as iron.

remember, your plants don't look horrible by any means. it's just something to correct for this grow and future grows. knowing your variables, like soil pH, can help mitigate problems quickly because you're likely delivering the proper nutrients, but they're not as available as they should be.

furthermore, you may end up feeding less because you've adjusted properly. you're almost at the end of this grow... and what's done is done. just keep track of what you've done, and make some slight changes next time. i recommend changing one variable at a time, otherwise it gets too complicated.

and an above post mentioned that your runoff is coming out hotter than its going in, dial down the feed amount a little bit.
 
ShLUbY said:
definitely. your soil is slightly alkaline or at least too close to neutral because of the buffer. you have to drop acidity of the water to deliver at the proper pH range because the buffer in the mix. seeing problems in the most recent growth almost always correlates with improper pH range.

i would be shooting for 6.0-6.2.

if you've never looked at one, google soil pH availability of nutrients and click the images tab. you can see where 6.0-6.5 is the sweet spot. but your mediums pH is higher than that based on your runoff reading (though I hate that, it's accurate enough to assume).

the key things that are affected by this slight high pH are copper and zinc, which activate enzymes and function in respiration, as well as iron.

remember, your plants don't look horrible by any means. it's just something to correct for this grow and future grows. knowing your variables, like soil pH, can help mitigate problems quickly because you're likely delivering the proper nutrients, but they're not as available as they should be.

furthermore, you may end up feeding less because you've adjusted properly. you're almost at the end of this grow... and what's done is done. just keep track of what you've done, and make some slight changes next time. i recommend changing one variable at a time, otherwise it gets too complicated.

and an above post mentioned that your runoff is coming out hotter than its going in, dial down the feed amount a little bit.
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Great advice. Always looking to learn more! I will drop my ph levels as well as the amount of nutrients im giving them. Thanks for your help.
 
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