Progressing Fast. Help!!!

[Jorje]

Hi guys! Greetings from South America!
One of my ladies seems to be having a defc/lockout progressing. It looks like calcium of phosphorus but I have tried everything and things keep getting worst.

Things began like this:

This was taken on May 19th, day 24th for the plant:
At this point I was thinking of nitrogen toxicity because the soil I started the growth with is hot (I know its not recommended, but I had exceptional results with it on my first growth), so I decided to flush the soil with 3x times the volume and gave the plant bloom nutes for te 1st time at 1/4 dose.

Then progressed to:

This is on May 24th, day 29 for the plant.
At this point things were looking more serious, I began suspecting of cal-mag issues, so I gave the plant bloom, calcium and magnesium at 1/4 each. I also kept some of the solution in a spray bottle and sprayed the plant every two days.

And now, 6th of June, day 42, things look like this:

I gave the plant bloom, cal/mag at 1/2 dose 5 days ago but things are not improving. Also kept spraying the plant with the 1/4 strenght solution.

As you can see this affects old and new growth, you can see that some of the buds that are under the canopy are looking somewhat healthy, so I thought that maybe the plant was oversensitive to light (they are under a 400 hps, never closer than 12 inches), or that the areas closer to the lights were processing stuff faster, so I raised the lights to 16 inches but nothing improved.

Temps are around 75 and humidity at 50%, so no issues there.

I think I see phosphorus and calcium defc there, already flushed, solutions are phd accordingly, so I am getting out of options here, the plant keeps growing, getting taller and buds fatter, but I have no doubt that if this is not corrected soon the plant will die, soon it will not have any healthy leave to keep the photosynthesis going.

Any insights?

Thank you!

 

[namvet25]

To be honest there in bad shape and not much can be done at this point.It looks like a cal/mag def and probably lock out so there not getting proper nutes.If you flushed them I would give them a lite dose of veg nutes for a little nitrogen continue with bloom nutes and keep giving cal/mag at 10ml per gallon and make sure your PH is around 6.5 or close.I'm not a HPS expert but your light may be way to close and may have caused some of the leaf damage also.I would raise the light up to 24 to 28 inches and that should still give them enough light.The damaged leaves can't be helped this far along so hopefully the buds are not hurt to bad so you will get some smokeable weed.If you run into a leaf problem next grow let us no right away before the get to bad.

 

[Jorje]

Thanks!
That's too bad, hopefully she wont die, but obviously the yield is going to be very compromised. I'll up the bloom and cal mag nutes and hope to have a defc and not a lockout.

 

[Waira]

Jorjie-- this is epic P defc., maybe some others muddied in with the symptoms,.. Ca defc. can look a lot alike P defc. to, and from what I see, P defc. can hit higher up than is usually expected,... First you MUST get a proper in-pot pH reading! I strongly suspect it went badly acidic in there (alkaline is much less likely unless your water is rock-hard), and is off-pH enough have P locked out,.. the large patches of dead tissue are hallmark signs,... early pick shows nute burn,.. we need your nutes, dosage and schedule,... all the flushing has at least likely cleared out salts build-up, but the excess nutes, plus the hot soil, would account for the badly acidic conditions in there,... I'm with Nammy on the light, too close, though fortunately, I don't see overt stress signs or burning,...

 

[Jorje]

Thank you very much for your answer !
For the lights I used this guide: http://www..com/how-far- , but I guess that the plants were to young yet to be exposed to that light intensity.

I'll try to get one of those soil meters. Do you know if the soil can get acidic with time? I bought it about 6 months ago for the first grow and it was sitting in a container until the second growth. I also have two other plants with the same soil which are doing fine.. I guess I need the meter to be sure.

I have been very easy on the nutes, perhaps too easy. The plant is 42 days. I used no veg nutes and bloom at day 26, 29 and 37, and only water at day 33. As stated above I kept some of the 1/4 strenght bloom/cal-mag solution for foliar feeding to try to correct the defc, but, correctme if I am wrong, a lockout can only happen at the roots right?

I have two other plants that are doing fine under the same schedule, one if the same genetic that the affected one, the other one is a dutch passion bb.

 

[Waira]

....yeah, it sure can, but usually not just sitting in the bag.. most have some sort of lime in it, which helps with pH buffering,.. this can get depleted as the grow progresses, and the the acidic feed inputs accelerate this,...
Huh, well then, this is just plain lack-of defc.'s, that really snow-balled at the end here,.. demands are high during bloom, and of course the plant is at her largest,... rich soil is one thing bro' but it's not always a proper balance of nutes, especially secondary and micronutrients, to say nothing of it being enough at later stages.. shoulda had you fill out the patient form first! .... flushing stripped out what little was there, and the 1/4 dose wasn't enough,... keep feeding her, high dosing,... as for foliar, if you weren't using as wetting agent and spraying the bottoms of the leaves as well, it wasn't helping much,.. this stuff help make the spray coat and stick better so more gets absorbed,.. bottoms of leaves have more stomata on them so more gets taken in there vs. tops surafes,... Also, during bloom, you risk mold, so I'd stop foliar totally at this point,... keep a close eye out for it now,.. bud rot starts from inside out, and with the leaves in such bad shape, it'll be more difficult to spot,... look for strangely withered sugar leaves, more off color than the rest,.. tug at it, and if it comes right off, it mold! you have to treat mold like gangrene, you cut away everything until it clear,...them prey! Keep RH low as possible, good air circulation,....

 

[Cannablissman]

Man. She looks bad. Wouldn't sprinkling some dried powdered eggshells over the soil neutralize the soil pH. Also they provide calcium when u water and deter crawly insects from getting too close to the plant.

 

[Waira]

...nope,...months too slow to break down and release, and the shell shards won't bother most bugs,.. snails/slugs maybe, ...