side of leaves curling up and dying - help

HI,
I am new to the forum and having a problem I never have seen in many years. I have used the same fertilizing program, watering program, everything except I changed my soil from Sunshine #4 to Pro mix.
Lost 50% of my crop last time and I cleaned everything with bleach and started again. My babies looked pretty good except just a few light green ones.
Well 2 1/2 weeks into vegetation I started to see the same issue again. Leaves near the top are turning up on the sides and then browning. Eventually it kills the plant. Last time I didn't notice it until the buds where growing pretty good and leaves with in the bud were browning then the whole plant would get it. Just one or two leaves within, initially.
Again I have never seen this ever before.Is it heat? It is pretty warm here in the summer like close to 90 to 100 and the room gets to be about 90. But it has like that before for years and no problem. Is it the soil? It is the only thing I have done different. Included are some pictures. I am just a couple weeks into veg state but it is there again??

Sounds like it's probably a Phosphorus deficiency.

Phosphorus (P)

When your plants are deficient in phosphorus, this can overall reduce the size of your plants. Not enough causes slow growth and causes the plant to become weak, to little amount of Phosphorus causes slow growths in leaves that may or may not drop off. The edges all around the leaves or half of the leaves can be brownish and work its way inwards a bit causing the part of the leaves to curl up in the air a bit. Fan leaves will show dark greenish/purplish and yellowish tones along with a dullish blue color to them. Sometimes the stems can be red, along with red petioles that can happen when having a Phosphorus deficiency. This isn’t a sure sure sign of you having one though, but can be a sign. Some strains just show the red petioles and stems from its genes.

i cant help you but i think i got the same problem



i know my ph was to high i only got it sorted

GreenphoeniX said:

Sounds like it's probably a Phosphorus deficiency.

Phosphorus (P)

When your plants are deficient in phosphorus, this can overall reduce the size of your plants. Not enough causes slow growth and causes the plant to become weak, to little amount of Phosphorus causes slow growths in leaves that may or may not drop off. The edges all around the leaves or half of the leaves can be brownish and work its way inwards a bit causing the part of the leaves to curl up in the air a bit. Fan leaves will show dark greenish/purplish and yellowish tones along with a dullish blue color to them. Sometimes the stems can be red, along with red petioles that can happen when having a Phosphorus deficiency. This isn’t a sure sure sign of you having one though, but can be a sign. Some strains just show the red petioles and stems from its genes.

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I don't think it is phosphorus as I feed them I steady amount along with the other food nutrients. Remember I have been feeding the same for years and no problem. Now I have one and the only thing different is the promix and the supplier says that it can't be that.
They do seem to not be growing like normal but I do get that somewhat in the summer.
I am frigging stumped.

Davii: those leaves are at the bottom where mine are at the top??

It looks like Phosphorus def to me. Just because you're feeding the plant Phosphorus, does not mean it's not a deficiency. There are other ways for deficiencies to come about.

Problems with Phosphorus being locked out by PH troubles:
Cold wet soils, acid or very alkaline soils, compacted soil.

Growing in Soil:

Phosphorus gets locked out of soil growing at pH levels of 4.0-5.5
Phosphorus is absorbed best in soil at a pH level of 6.0-7.5 (wouldn’t recommend having a ph of over 7.0 in soil) Anything out of the ranges listed will contribute to a Phosphorus deficiency.

Hydro and Soilless Mediums:

Phosphorus gets locked out of Hydro and Soilless Mediums at pH levels of 6.0-8.5.
Phosphorus is absorbed best in Hydro and Soilless Mediums at pH levels of 4.0- 5.8. (Wouldn’t recommend having a ph over 6.5 in hydro and soilless mediums.) Best range for hydro and soilless mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Phosphorus Deficiency.

Also: Parts affected by a phosphorus deficiency are: Older Leaves, Whole plant, Petioles.

So just because davii has the problem on the lower leaves of the plant, does not mean it's a different problem necessarily, P def can visually appear in many different ways which can make it hard to diagnose sometimes.
Note: A certain amount of P def is normal during flowering, but too much should be tended to.

You're problem may also be related to heat stress and/or under watering. Check the plants with a magnifying glass for bugs if you think it's necessary.

I do really appreciate the input!!

First thing I checked was for bugs but nothing there. Then I checked the PH and they are all at 7.0.
Definitely heat may be a factor and if anything I thought I was over watering because of the heat.

What do you recommend I do?

Hahaha, damn man, you got yourself one of those unique situations.

Well if your soils pH is in check etc. then maybe your soil is too compacted (which I highly doubt, but is possible I suppose).

You mentioned your temp was in the 90's (F) ... I'd say it's caused by heat stress, maybe the strain you're growing is a bit more sensitive to heat than some of the other strains around.

You could try looking around for a more heat tolerant strain, or try to get those temps down. They may be going above 90 in the peak heat of the day. You can't really solve hot temps by sucking in more hot air so you could try some sort of air conditioner, or try a different strain, and try this strain again in cooler months. But see how they go, if they don't die, you may still get some bud!

Anyone else able to help? Hahaha, I'm a bit stumped.

Cheers.

Thanks I really appreciate the help. I hope someone else reads this and has an idea or has had this issue.
Like I said I have been doing the exact same thing for a long time and never a problem like this. I will be changing the soil - if it is not too late - I hope!!

Have the temps being higher since you changed soil, or are they the same as when you were using the other stuff?

It definitely looks like it's cause by heat or P def.

I used the first soil in this temp lots before.
I changed the soil at the end of spring so it wasn't that hot out but when it got to the summer it got worse.
I think heat is an issue but for some reason I think it is the soil too as that is the only thing I changed, It has some kind of bacteria blocker in it compared to the Sunshine #4.Are you familiar with Promix. I read good things about it so I thoguht why not. Now I know, if it aint broke.....
I plan on just letting them grow so I can get a lot of good clones from the good plants that are left. Right now I am about 35% with this problem.
This is not a big set up by any means but it is my pride and joy.

I don't know if this means anything but when I put the PH meter in, it jumps up high to alkaline side quite high then immediately drops to 7 but it does do that jump right away. I haven't had a problem like this so I have never used a PH meter for a long time so I forget how it is supposed to react.
If it is too much alkaline how do you fix that.
Or is this normal?

Thought I would take another couple pics as they seem worse today. The pictures don't really show how bad they are, They are a really light green in color instead of a real dark green.
You can see from where they turn up on the edges that the leaves start to get a lot lighter in color.
Any thoughts on what I can try on one for phosphorous - what do I do to bring it up or maybe magnesium? Epsom salts?
Grabbing at straws here.

dude...you got a magnesium deficiency for sure

how much epsom salt per gallon do I add for this??

add a 1/4 teaspoon per gallon of epsom salts or lime

I just recently watched Jorge Cervantes video and it showed this problem to be from the plant trying to cool itselt due to excessive heat.

LoWd0Wn said:

Thanks I really appreciate the help. I hope someone else reads this and has an idea or has had this issue.
Like I said I have been doing the exact same thing for a long time and never a problem like this. I will be changing the soil - if it is not too late - I hope!!

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Dude the fact that you even pulled off growth during temps of over 85 degF is an accomplishment, most strains slow or stop growth, or have many other problems over this temp. 90 Degrees is too hot for most strains, and that's probably your problem. How high is your relative humidity? If thats too high that could hurt your plants too.

Normally 80 degF is as high as you want to go to be safe, and anything over 85 degF can stop or slow growth. It's usually a combination of things though, I've found, not just one specific factor. Hope I could help.

Use Dolomite Lime ... It's like Superman compared to epsom salt because it does what espom salt does, but more! ... Dolomite lime will cure a Mg def (if that's what it is), as well as provide Calcium (Ca) and balance your pH out. It could be a Mg def ... I'm not really familiar with them as I always premix Dolomite Lime into my soil mixes so it's never occured

I'm not familiar with promix, I've never used it, I figure why reinvent the wheel right?

Cheers.

I promise you it's Mg def. just fix it and you will be okay...it's not heat stress...the coloration and curling is classic Mg...which is often confused with heat stress... you may wanna take a look at this.....

Ganja Guerrilla's Hall of Marijuana Plant Abuse

Thanks,
I will go pick up some dolomite lime in the morning. I have epsom salt here but if you recommend that I will get it.
How much dolomite per gallon??

honkeytown; what do you recommend for it as a fix? and how much to use/
Again Thanks everyone!!