Mg deficiency? margins curling. please verify.

[Guest]

Strain: Pot of Gold
Day: 3 weeks
Nutes: TAP Water, AN Sensi A&B 600ppm, Big Bud 100ppm, Barricade 10ml
carboload, B52, fulvic and humic all at 1ml/1L
Temps: 86.4* day 80*night
Res: 75* ph 5.5-6.0
Medium/style: e&f in hydroton floods 4x times a day for 10 mins. NO CO2
Lights: 600w aircooled sun system 2 reflector with vortex 6" 449cfm fan 1 foot away from tops

I think I have a mag def. because I have curled margins on my fan leaves and the tips are a little burnt right under the new growth. leaves appear dark green when the hps is off, veins look yellow to me but i don't know if people would consider it light green. overall, the POG looks healthy. it is currently in a "praying stance" which i thought was good but i read somewhere that she can be praying for mg.

i looked at http://www.ganjaguerrilla.net/ and noticed a few pics looks kind of like mine from different stages. i don't think it's heat but i can be wrong. can someone verify my diagnosis or let me know if i need more info? i was thinking an extra 50ppm of espom salt in the res, too late to foliar, right?

close up of curling, and there's some blot on the fan leaves too.


another pic

 

[space cowgirl]

Mine were doing the same thing and it turned out to be heat stress.

 

[stinkyattic]

Heat stress and hot spot

Heat stress and hot spot

You're running hot and I'll bet quite dry too. Curled up margins are a sign of acute heat stress, and I see some plants that look like they suffer from chronic heat stress in the background of the pic. In fact, the plant shown seems healthier than the ones behind it, that show bleaching and droop.
Drop your temps 10 degrees and move the affected plant out of the 'hot spot' under the light, replacing it with teh shortest plant you've got.
Oh shoot hydro- probably can't move the plant?
Anyway you should be more like 76 day/70 night.

 

[MynameStitch]

Ok it does look like heat stress; but can you take a picture of your plant without the HPS on? that praying for magniseum thing is bunk and I would not listen to it.

From the times I have seen magniseum always makes the leave veins green..... when you see what you have here now with the leaves margins curling upwards that means it's dry meaning heat, low humidity is causing the issue..
I am not saying you have low humidity; I am saying the leaves curl upwards like that can be caused by a few different issues; but in this issue it looks to me that heat is the culprit; but before I make a 100% answer I need to see that plant without the hps on.

What fan are you using to cool your hood? You have glass on your air cooled hood? You have a 4 in opening 6 in opening?

 

[Guest]

You're running hot and I'll bet quite dry too. Curled up margins are a sign of acute heat stress, and I see some plants that look like they suffer from chronic heat stress in the background of the pic. In fact, the plant shown seems healthier than the ones behind it, that show bleaching and droop.
Drop your temps 10 degrees and move the affected plant out of the 'hot spot' under the light, replacing it with teh shortest plant you've got.
Oh shoot hydro- probably can't move the plant?
Anyway you should be more like 76 day/70 night.

in the summer, temps reached 94*. i don't really have a way of cooling the room down even more. the plants in the back are nirvana's haze and are in a separate e&f table. i thought was effected by the heat/nute burn too. the plant shown (POG) is my 3rd attempt, the ones in the background are my 2nd. what causes bleaching and drooping? too much heat? how do i find a hot spot in under my light? i can move the plants. i have 4 small diy e&f table with under 10 plants in each of them. once a net goes up, its very annoying to move though. 76d/70n, i wish, i can't control the temps precisely yet.

 

[Guest]

Ok it does look like heat stress; but can you take a picture of your plant without the HPS on? that praying for magniseum thing is bunk and I would not listen to it.

From the times I have seen magniseum always makes the leave veins green..... when you see what you have here now with the leaves margins curling upwards that means it's dry meaning heat, low humidity is causing the issue..
I am not saying you have low humidity; I am saying the leaves curl upwards like that can be caused by a few different issues; but in this issue it looks to me that heat is the culprit; but before I make a 100% answer I need to see that plant without the hps on.

What fan are you using to cool your hood? You have glass on your air cooled hood? You have a 4 in opening 6 in opening?

i edited my first post. 6" sun system 2, glass, air cooled with vortex 6" 449cfm. new pics too, no hps. tell me what color those veins are so i know for next time. how many things can cause curling upward margins? my leaves also seemed a little brittle, they don't break when i touch them but they do feel dry. sounds more like heat stress since so far everyone is in agreement. i added 1ml/1L of revive and 50ppm of espom salt to the res. before i even posted this thread thinking mg was going to be it, you think that's going to be an issue?

also, i looked at the discolored tips as a sign of reaching the max nute ppm. was i mistaken and should i increase the dose?

 

[MynameStitch]

the plant is doing fine I would not up the dosage just yet, dude you have all that and you still have those temps? I had the exact same setup but I had a 1,000 watt sun system with the vortex and air cooled hood.

Those vortex's kick ass!
Yes it seems to me it's a little hot and which is why they are getting a little brittle. you are going to have to find a way to get those temps down, can you take a pic of your grow room? If you can't get it down; your plants are not going to die.... but I am sure your yield will be reduced.

this is your quote from another thread

will develop my own opinions when i get to your experience, but i am starting to see there's a lot of alternatives and i shouldn't buy into all the hype. i'm in hydro, but i won't jack this guy's thread cause you're already helping me out in my thread too

I have used AN and I compared it to organic grow, AN only came in a little ahead of it and is not worth the price, Now if you are growing hydro then that is a different story; AN works very well in hydro; but for soil it works about the same as most organics.

Most of there products are hype and I did not fall for it; I watched many peoples grows when they were using AN. I did not see a difference really in most of there products except for the ones that are really good to use; like the ones I listed previous post.

 

[Guest]

the plant is doing fine I would not up the dosage just yet, dude you have all that and you still have those temps? I had the exact same setup but I had a 1,000 watt sun system with the vortex and air cooled hood.

Those vortex's kick ass!
Yes it seems to me it's a little hot and which is why they are getting a little brittle. you are going to have to find a way to get those temps down, can you take a pic of your grow room? If you can't get it down; your plants are not going to die.... but I am sure your yield will be reduced.

this is your quote from another thread


I have used AN and I compared it to organic grow, AN only came in a little ahead of it and is not worth the price, Now if you are growing hydro then that is a different story; AN works very well in hydro; but for soil it works about the same as most organics.

Most of there products are hype and I did not fall for it; I watched many peoples grows when they were using AN. I did not see a difference really in most of there products except for the ones that are really good to use; like the ones I listed previous post.

the only way of lowering temps is coming soon... winter!

i know my plants are doing ok, i'm not the grower stressing about every little thing, but on my 2nd grow, i thought i was doing good until i didn't pay attention and had a whole bunch of problems, so this time i told myself i would examine harder and ask more questions.

i noticed AN has a lot of separate ingredients (maybe 5) that liquid karma contains in one. i even see some of the AN vets switching up ingredients here and there.

i will conclude that this problem is due to heat stress and just let things be, but when do i know when to increase the ppms? i want them to grow as vigorously as possible.

 

[MynameStitch]

You use to much you will cause them to have a short stunt because then you will have to flush and they have to recover. So it's best not to add anymore untill they need it.
What ppms are you using now?

Here is a chart; Levitiz had this chart but the stoner could not remember where he got it from :laugh:

Indica's
Seedlings and clones 300-400ppm 5.3-5.5 ph
early vegg 500-600ppm 5.3-5.6 ph
middle vegg 600-800ppm 5.4-5.6 ph
late vegg 800-1000ppm 5.5-5.7 ph
early flower 1000-1300ppm 5.5-5.7 ph
middle flower 1400-1600ppm 5.5-5.8 ph
late flower 1000-1100ppm 5.5-5.7 ph
ripening 300-500ppm 5.4-5.6 ph

sativa's
seedlings and clones 250-350ppm 5.3-5.5 ph
early vegg 300-500ppm 5.3-5.6 ph
middle vegg 500-700ppm 5.4-5.6 ph
late vegg 700-900ppm 5.5-5.7 ph
early flower 1000-1100ppm 5.5-5.7 ph
middle flower 1100-1300ppm 5.5-5.8 ph
late flower 800-1000ppm 5.5-5.7 ph
ripening 300-500ppm 5.4-5.6 ph

This is just small guideline on ppms and it depends on how big the plant is, smaller plant= lower ppm's/EC

They are growing very well I would not up it untill you see a problem with the plant first then fix it as it comes along.

 

[Guest]

600ppm sensi a&b, 100ppm big bud plus the additives. POG is 50/50 no? i seem to be a little low according to your chart.

 

[MynameStitch]

Well, the chart is just guideline; you may have a strain that does not need a lot of nutrients. Again I would not up the nutrients yet, unless it starts to show difficulty.
All strains of cannabis is different; some require more nutrients than others, some burn easier. Some can take more heat than others.... etc.

 

[stinkyattic]

what causes bleaching and drooping? too much heat?

The green you see is chlorophyll, and it breaks down in high temperatures. Basic metabolic processes of cannabis come to a grinding halt at 95 degrees.

how do i find a hot spot in under my light? i can move the plants.

GREAT! Put the shortest one in the spot where you saw the leaf curl, and move that one (probably taller from having closer proximity to the light?) towards a corner. You can feel with your hand too- if it's uncomfortable, you're too hot.

76d/70n, i wish, i can't control the temps precisely yet.

You now have a PROJECT!!! And projects make growers happy! (right?) BIG BAD EXHAUST FAN!!!!! Air-cooled hoods! Intake from an air-conditioned room!

Good luck!