Autopot with coco possible phosphorus issue

[hillbillydeville]

These are on day 60. I've been noticing some lightning of the leaves and the spots followed by necrosis. Ph levels are at 6 plants are in coco feeds are an nutes with big bud , terpinator being added at 1.5 per liter, base nutes are at 2.0 per liter. Humidity is 40-50 and temps are at 81. This is my first full grow in this medium and as usual when the blooms get going the issues begin. Any advice is welcome

 

[Rev. Green Genes]

This is one of those where I can't tell if it's pH lockout or deficiency. If you just switched to flower, I am leaning towards pH being low. But the symptoms seem consistent with immobile nutrients deficiency. It would help to get some natural light pics, one of the whole plant, and one of the damaged leaves.

 

[hillbillydeville]

I

Here's some pics in natural light

 

[Rev. Green Genes]

If you are sure the actual pot pH is 6, than I would say she needs a foliar spray, and a some cal/mag and micronutrient additive.

The new leaves are deficient, but not the old ones. She's hungry.

Are the spots there before the leaves started yellowing? Those look like pH burn, but the yellowing looks hunger not lockout. @Waira Is this iron def?

 

[hillbillydeville]

Pretty sure on the ph, I had added some side lighting to these(led) and looking back it seems this is when the issue came in. I started the big bud coco on these and it has added cal mag in it I stopped adding supplemental cm after that. As for foliar spray I'm in a pretty rural area nearest shop to me is a 2.5 hour drive.i can get a box store micro and I believe I have some micro from the 3 part series I can try. Any home remidies you can think of

 

[Rev. Green Genes]

I might. Most of those are long term acting in soils. Do you have a farmers coop or garden center? I will think a minute and look at my notes and get back to you on fast acting micro sources. Adding some of the AN micro would do the trick, use it if you have it.

 

[Rev. Green Genes]

BORON: Granite dust, vetch, sweet clover, muskmelon leaves.
COBALT: Manure, mineral rocks, tankage, yeast, legumes, vetch, peach tree refuse, Kentucky bluegrass.
COPPER: Wood shavings, sawdust, redtop, brome grass, spinach, tobacco, Kentucky bluegrass, dandelions.
IRON: Seaweed, most weeds. Is usually available for plants in acid, organic soils; the slight acidity dissolves and chelate iron. Humus is one of the best sources of iron for your plants.
MANGANESE: Manure, seaweed, seawater, forest leaf mold (especially hickory and white oaks), alfalfa, carrot tops, redtop, brome grass. MAGNESIUM: Dolomite, high magnesium limestone, magnetite, silicate minerals, soluble salts, lake and well brines, seawater.
MOLYBDENUM: Cornstalks, vetch, ragweed, horsetail, poplar and hickory leaves, peach tree clippings.
ZINC: Rock phosphate, ragweed cornstalks, vetch, horsetail, poplar and hickory leaves, peach tree twigs, alfalfa
Calcium: rinsed, crushed, dried eggshells, made into tea or worked in to topdressing.

 

[hillbillydeville]

Cool, as for the underfeeding in the past I have been a little heavy handed with the nutes. This is a completely new setup for me and I tried to keep this as simple as possible. I've used sensi a/b voodoo cal mag big bud that's it and u know when you change the setup growing pains happen. I have a accurate 8 and a ph/ppm pen, just pisses me off cause these were going well. Right now my res is at 2mg a/b 1.5 big bud 1.5 terpinator

 

[Waira]

HBDV, what's up man?

So, you're in coco,... I read something about a res', are you in Autopots or something like that? This isn't a drain-to-waste deal? I ask because getting run-off ppm's and pH, plus in-pot pH via the A8 would offer clues,... Rev' GG is right, this sure ,looks like a micronute def., with what looks like a K issue too,.. the bitch is, with K, both defc. and toxicity symptoms look much alike, particularly the browning out at leaf tips and margin "teeth" tips,... interveinal chlorosis is not as definitive, but since it's all up high, it's very likely an immobile micro', Zn and /or Fe...
What needs to be figured out is if this is an off pH issue, a nute salt build-up issue, or plain old lack-off issue... the fixes will be different though! If the A8 is showing 6.0, then +/- 0.2 is still in OK range for coco,... The A8 works best when not put into really saturated medium, nor any kind of dry,... Is the tip buffed nicely clean, and was the reading taken after a couple minutes resting?
... if that's all good, then salt build up or plain lack of is left, opposites unfortunately, and this is where that ppm/EC reading would help! Too much cation overload in there will mess with uptake of other like-charged nute elements,.. Ca-Mg is often a culprit here, but with coco, and it's wacky CEC demand for it, it's harder to get there than in soil I think,... plus, coco has a lot of native K as well potentially,... Doesn't look like you're overfeeding though,... do you have a EC/TDS reading on your nute solution?
Most 3-part nute lines with "micro" will be loaded with N, along with the micronutes, so that's not always a good option,... best is a dedicated supplement, like Earth Juice Microblast,... and foliar is the fastest way into the plant... also best for immobile nute defc. treatment, gets it right there, right now!

 

[hillbillydeville]

HBDV, what's up man?

So, you're in coco,... I read something about a res', are you in Autopots or something like that? This isn't a drain-to-waste deal? I ask because getting run-off ppm's and pH, plus in-pot pH via the A8 would offer clues,... Rev' GG is right, this sure ,looks like a micronute def., with what looks like a K issue too,.. the bitch is, with K, both defc. and toxicity symptoms look much alike, particularly the browning out at leaf tips and margin "teeth" tips,... interveinal chlorosis is not as definitive, but since it's all up high, it's very likely an immobile micro', Zn and /or Fe...
What needs to be figured out is if this is an off pH issue, a nute salt build-up issue, or plain old lack-off issue... the fixes will be different though! If the A8 is showing 6.0, then +/- 0.2 is still in OK range for coco,... The A8 works best when not put into really saturated medium, nor any kind of dry,... Is the tip buffed nicely clean, and was the reading taken after a couple minutes resting?
... if that's all good, then salt build up or plain lack of is left, opposites unfortunately, and this is where that ppm/EC reading would help! Too much cation overload in there will mess with uptake of other like-charged nute elements,.. Ca-Mg is often a culprit here, but with coco, and it's wacky CEC demand for it, it's harder to get there than in soil I think,... plus, coco has a lot of native K as well potentially,... Doesn't look like you're overfeeding though,... do you have a EC/TDS reading on your nute solution?
Most 3-part nute lines with "micro" will be loaded with N, along with the micronutes, so that's not always a good option,... best is a dedicated supplement, like Earth Juice Microblast,... and foliar is the fastest way into the plant... also best for immobile nute defc. treatment, gets it right there, right now!

It seems every time I plant a auto I end up in your neck of the woods. Managed to get a foliar micro at the box store, will let you know the outcome.when I acted on this I did a flush and for a moment thought I stepped in the dogs business, even checked my shoe. The smell was actually from the bottom of the pots. Never will forget it!, anyway the runoff ppm was around 1100 and I can assume that's high. My feeds ppm I tried to keep at 650 but the last2 were around 900 the ph wasn't too bad. So I'd have to guess that I either have root rot or a sodium issue. Nonetheless I'm sticking with this current setup and hopefully will graduate from apprentice to journeyman one day.thank you both for your time