bros please help diagnose these leaf spots

[billytimmy]

what we have here is a fast buds crystal meth plant, maybe 45 days old, started developing spots on the leaves a week or so ago, started on the top fan leaves, of course there are only a few of them anyways

• promix soil
• 1k hps
• 18/6
• 70(night)-74(day)F
• ~40RH
• nutes: fox farm trio, cal mag, big buds
• not overwatered
• other plants are fine, tho different strains
• some of the bottom leaves are yellow from LST close to the soil, no problem there
• http://www.worldwide-marijuana-seeds.com/products/fastbuds-crystal-meth

 

[Vic]

Look at the deficiency post for new growers here. Looks like P def but check out the link it has pice you can look at and match with what issue you have. I'm an auto noob and found it very useful. Cheers. Vic

 

[billytimmy]

Look at the deficiency post for new growers here. Looks like P def but check out the link it has pice you can look at and match with what issue you have. I'm an auto noob and found it very useful. Cheers. Vic

yea could be a few things tho

 

[Waira]

bt- That's straight-up Ca defc. my man,...the the freckle-spots and where they are ont eh plant (higher up) are classic symptoms,.. Ca is poorly mobile within the plant, meaning she can't scavenge within very well from other lower fan leaves, to support upper growth... any idea what your soil pH is? What's your current dosage on the Ca-Mg? I know, it seems weird to get Ca defc. when you're supplementing already, but it can happen! --some plants are just total hogs, and not getting enough, or more concerning, the soil pH is off enough to cause some level of lockout (chemistry changes that render the nute' in question unabsorbable),.... anyway, a soil pH reading is needed; if you're doing the run-off method, follow this guide- ( https://www.autoflower.org/threads/...-testing-and-ph-estimation.41733/#post-928975)... generally, run-off testing is dicey no matter what, as it's prone to lots of potential measurement errors! Best thing for this is actual in-soil testing, with something like an Accurate 8 soil pH probe...this tool will pay for itself in short order, trust me! Point is, if the pH is off enough, dumping more Ca-Mg will make matters worse, not better....

 

[billytimmy]

bt- That's straight-up Ca defc. my man,...the the freckle-spots and where they are ont eh plant (higher up) are classic symptoms,.. Ca is poorly mobile within the plant, meaning she can't scavenge within very well from other lower fan leaves, to support upper growth... any idea what your soil pH is? What's your current dosage on the Ca-Mg? I know, it seems weird to get Ca defc. when you're supplementing already, but it can happen! --some plants are just total hogs, and not getting enough, or more concerning, the soil pH is off enough to cause some level of lockout (chemistry changes that render the nute' in question unabsorbable),.... anyway, a soil pH reading is needed; if you're doing the run-off method, follow this guide- ( https://www.autoflower.org/threads/...-testing-and-ph-estimation.41733/#post-928975)... generally, run-off testing is dicey no matter what, as it's prone to lots of potential measurement errors! Best thing for this is actual in-soil testing, with something like an Accurate 8 soil pH probe...this tool will pay for itself in short order, trust me! Point is, if the pH is off enough, dumping more Ca-Mg will make matters worse, not better....

hey thanks I think you are right, current cal mag is 3-6ML 2 times a week approx

the soil ph started in the bag at 7 and every drop of water is meticulously PH'd 6.4-6.6 so over 45 days I cant see how it swung out of whack where cal is locked out but i suppose its possible, I might try run off test next time

hmmm after looking into CA deficiency I wonder if the issue is too much potassium from the bloom nutes, (big bug, tiger bloom) which I started giving them? that seems more plausible than PH in my situation

yea i think thats it ill flush tonight thanks dude

 

[Waira]

... yeah, you done good by keeping your input pH's well adjusted, but the soil's a dynamic thing, especially the root zone and the soil microbes! ..lots of chemistry changes going on there, which can go astray sometimes! Inputs and lime alone can't manage pH in a bullet-proof manner alone,... So, is the Ca-Mg per L, or gal? Which brand? ...they tend to have variable concentrations between them, so dosage is one thing, the strength of the brands conc. is another,... No worries about K toxicity, you'd have other symptoms as well by that point! TB isn't that concentrated, and Big Bloom is a total misnomer-- have you looked at the NPK values on it? they're all in the decimal range beyond mild! So, I treat BB like a supplement, and it is good stuff! .... Don't flush just yet! Do that run-off test first, using the suggested method...be sure to have some RO/DI water on hand, a calibrated meter, and to follow those directions to the letter for best results ... after we get a solid pH reading we can be sure of best correction, but likely, upping the Ca-Mg dosage is the ticket .... If you weren't in bloom, I'd have you do a foliar spray, which is the fastest way into the plant, and it bypasses any soil/root issues,...

 

[billytimmy]

... yeah, you done good by keeping your input pH's well adjusted, but the soil's a dynamic thing, especially the root zone and the soil microbes! ..lots of chemistry changes going on there, which can go astray sometimes! Inputs and lime alone can't manage pH in a bullet-proof manner alone,... So, is the Ca-Mg per L, or gal? Which brand? ...they tend to have variable concentrations between them, so dosage is one thing, the strength of the brands conc. is another,... No worries about K toxicity, you'd have other symptoms as well by that point! TB isn't that concentrated, and Big Bloom is a total misnomer-- have you looked at the NPK values on it? they're all in the decimal range beyond mild! So, I treat BB like a supplement, and it is good stuff! .... Don't flush just yet! Do that run-off test first, using the suggested method...be sure to have some RO/DI water on hand, a calibrated meter, and to follow those directions to the letter for best results ... after we get a solid pH reading we can be sure of best correction, but likely, upping the Ca-Mg dosage is the ticket .... If you weren't in bloom, I'd have you do a foliar spray, which is the fastest way into the plant, and it bypasses any soil/root issues,...

thanks man, cal mag is per gallon, the general hydro brand

before we leave the K subject, its *possible* some rock resonator got into this plant but I cannot remember if I ever gave it to this one

 

[billytimmy]

... yeah, you done good by keeping your input pH's well adjusted, but the soil's a dynamic thing, especially the root zone and the soil microbes! ..lots of chemistry changes going on there, which can go astray sometimes! Inputs and lime alone can't manage pH in a bullet-proof manner alone,... So, is the Ca-Mg per L, or gal? Which brand? ...they tend to have variable concentrations between them, so dosage is one thing, the strength of the brands conc. is another,... No worries about K toxicity, you'd have other symptoms as well by that point! TB isn't that concentrated, and Big Bloom is a total misnomer-- have you looked at the NPK values on it? they're all in the decimal range beyond mild! So, I treat BB like a supplement, and it is good stuff! .... Don't flush just yet! Do that run-off test first, using the suggested method...be sure to have some RO/DI water on hand, a calibrated meter, and to follow those directions to the letter for best results ... after we get a solid pH reading we can be sure of best correction, but likely, upping the Ca-Mg dosage is the ticket .... If you weren't in bloom, I'd have you do a foliar spray, which is the fastest way into the plant, and it bypasses any soil/root issues,...

ok, so i ran the soil ph test about 8 times and the average ph was right around 6

 

[Waira]

...good! that's what your calculation worked out to? It's a bit too acidic in there, so adjust your feeds and water (if needed) up to around 7.0 for a few rounds, and see if it comes up to mid to low 6's...no need to flush, which you basically halfway have now after running that test 8 times! Truth is, it's that first run that matters most, after that, you diluted things enough to skew results,... do you recall the first reading? -that's what I need to see.....GO/GH makes fine products,... I like the GO version of Ca-Mg better though, it's all carbonate derived, better for buffering low pH! Your previous dosage was pretty mild, so I'd go full strength at least, maybe add an extra 1tsp full beyond that to boost levels up faster,...

 

[billytimmy]

...good! that's what your calculation worked out to? It's a bit too acidic in there, so adjust your feeds and water (if needed) up to around 7.0 for a few rounds, and see if it comes up to mid to low 6's...no need to flush, which you basically halfway have now after running that test 8 times! Truth is, it's that first run that matters most, after that, you diluted things enough to skew results,... do you recall the first reading? -that's what I need to see.....GO/GH makes fine products,... I like the GO version of Ca-Mg better though, it's all carbonate derived, better for buffering low pH! Your previous dosage was pretty mild, so I'd go full strength at least, maybe add an extra 1tsp full beyond that to boost levels up faster,...

ok I totally screwed this up :smoking:, after adjustment my ph would be around 5 and the first run maybe 4.7?

I dont understand how it could be so low

I have a bunch of plants and this is the only one showing anything, I am way more confused now

after looking around maybe garden lime (I have some) might do the trick?

UPDATE:
ok jut ran to the store and picked up a soil test kit, with the capsule and container, its telling around 6.5 from the color