Lots Of Necrosis On Yellowing Leaves

Fours weeks into flowering and what I thought would work itself out has probably become quite a mess.

I'm guessing a nasty Ca deficiency. Probably also Mg.

First off: AK clone, FFOF soil, CFL, small dose of bloom nutes at start of flower cycle. Water pH'd to around "medium green". No idea on PPM (it's city tap water if that could mean anything). Temps are 65 (dark) - 85 (light).

I first noticed the seriousness of this about a week ago.

Just did a full (and first) plain water flush yesterday.

The leaves that are exhibiting this problem are from all over the plant. I'm guessing that nothing can be done now so close to harvesting, I'm sure. But, helping identify this problem now might help me with the four clones I have in veg for two more weeks.

Thanks for any help!

No one's ever seen something like this before?

are the tips burned/scorched?

Yo!

A few more details would help I think. When you say you plain water flushed for the first time yesterday, do you mean thats the first time they got plain water only? or just the first time you flushed with an excessive runoff?

When you feed or water, how much runoff are you allowing (if any) through the bottom of your pots. RO water or tap/well water?

How long are you vegging for before 12/12? and are you feeding in the FFOF during veg? or just water.

What kind of nutes, and when you say a light feeding, what do you mean? i.e. dosage 10ml of Advanced Blablabla per gallon,

I think you are on the right track with the Ca deficiency, but you may need to check the soil PH to make sure its not out of wack. Also a little more info about the nutes(the kind, if fed in veg, strength/dosage etc), and the water runoff will give a better picture of whats going on.

I know its frustrating to see 100 views and no replies when you've got an urgent issue, but come back with a lil more info and we'll talk it out But I'm NO pro, I'm dealing with a diagnosis of my own and came across your thread. But check mine out, I'm also using FFOF. Peace

SiRStonedAlot said:

Yo!

A few more details would help I think. When you say you plain water flushed for the first time yesterday, do you mean thats the first time they got plain water only? or just the first time you flushed with an excessive runoff?

When you feed or water, how much runoff are you allowing (if any) through the bottom of your pots. RO water or tap/well water?

How long are you vegging for before 12/12? and are you feeding in the FFOF during veg? or just water.

What kind of nutes, and when you say a light feeding, what do you mean? i.e. dosage 10ml of Advanced Blablabla per gallon,

I think you are on the right track with the Ca deficiency, but you may need to check the soil PH to make sure its not out of wack. Also a little more info about the nutes(the kind, if fed in veg, strength/dosage etc), and the water runoff will give a better picture of whats going on.

I know its frustrating to see 100 views and no replies when you've got an urgent issue, but come back with a lil more info and we'll talk it out But I'm NO pro, I'm dealing with a diagnosis of my own and came across your thread. But check mine out, I'm also using FFOF. Peace

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This was the first time I've flushed water through the soil. Normal waters are about 3/4 gallon (3 gallon pot) and I dumped 8 gallons of water through the other day using pH'd 6.5 150ppm tap water.

The only thing I've fed this plant is some Fox Farm Big Bloom. Going through my journal I see I've fed 9.5 tablespoons total over 5 different waterings starting at the end of the 4 week veg cycle till now. Plain old pH 6.5 water used on waterings between feedings.

I've added a tablespoon on Cal/Mag to each of the plain water waterings.

I was just able to take a soil test with those metering systems where you fill up three different chambers and toss in a colored capsule and shake type of dealies - ANYWAY - it basically showed : N-zilch P-looked kind of high and K-perfect.

I took a trip to my local good guy hydro store (support your local stores!) and in discussions, I probably just need to increase the Cal/Mag. He also says that the FFOF is way too hot for our plants (where I've heard elsewhere) and suggests to cut it 60/40 with something else. Sounds like a plan to me on future grows.

Unfortunately, I have some great looking veggies going on of a really good strain and I'd hate to transplant them and risk screwing them up. I'm going to keep up on a Cal/Mag regimen during the next flowering. Probably also flush really good at the end of veg, too.

The only thing I've fed this plant is some Fox Farm Big Bloom. Going through my journal I see I've fed 9.5 tablespoons total over 5 different waterings starting at the end of the 4 week veg cycle till now. Plain old pH 6.5 water used on waterings between feedings.

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9.5tablespoons in how much water? that'll let us know how strong your nute mix has been.

Its true that FFOF is known as a hot soil, and Ive found that to be true, but my big eating strains love it in veg, and I'm just figruing out when they run out in flowering so I know when I need to add more to the soil. However all I ever fed was water (0ppm RO filtered water) for the first 4 weeks, they thrived and seem to have enough nutrients in the soil to do so. No need to hammer them with nutes if they don't need it (because there is some in the soil). One thing I had problems with near end of flowering, last round, using FFOF was that I wasnt watering enough aand getting any runoff- I've learned its important to get a good 15-20% runoff (i.e if you feed 1 gallon, you'll want a pint to a lil less than a quart to runoff thru the bottom).

If you are using RO water, then If found (and read) its easy to run into calcium or magnesum deficencies because the filters take all of that out of the tap water. This run I've switched over to organics (Guano, EWC, etc Tea's , pre-ammendments to the soil, etc) and I'm trying to get away from the Salt basted/synthetic nutes as I've had nothing but problems burning plants, getting lockout from salt buildup (huge rings of salt around the inside of my pots after a harvest) and a lot of it was underwatering and not fully watering when I do. Its good to let them get somewhat dry between watering, but I'm finding its about equal to proper wating and runoff. If the FFOF is still hot and you're adding Salt nutes to it, without properly flushing through, then you're probably just adding to the problem in my opinion.

Id say flush them once more, then come back with 1/4 strength nutes including some Cal/Mag. I think you're on the right track, and the best thing you can do right now is learn and apply solutions to the next round, which is what it looks like you're doing.

Good luck.

oh sorry, see you are using city tap water... you may or may NOT need the calmag. You really need to get your tap water tested. Take a bottle of it in to the hydro store, they will probably use one of their dispay PPM meters. If you have hard water things could be difficult, you kind of need to know or use RO water so you know you're starting at 0 and go from there.