underwatering?

[Guest]

I think i might have underwatered my plants but i want to make sure i diagnosed it right. the ridges on the leaves are much more profound than normal, and they are curling in a bit. no yellowing..yet
it got introduced to a 600whps 5 days ago, so may still be getting used to it
well take a look and tell me what yall think please

thanks

 

[MTF-Sandman]

Looks like heat stress to me, but it could be from underwatering...I guess.

 

[Blackvelvet]

Inward curl/upward curl of lower leaf margins may be magnesium deficiency. Investigate this. Veins on lower leaves remain green with the area between them becoming yellowish.

 

[Blackvelvet]

Click on it to make larger.

 

[Guest]

magnesium defiency ok. can i foliar feed w/ epsom salts to fix it?? or whats best solution?

 

[eugenegreen]

I wouldn't foliar feed but if you do, then please do it when your lights are off... Much love and JAH Bless... Oh and I concur with the above diagnosis...

 

[stihgnobevoli]

i have a magnesium deficiency, and my margins are neither curled nor cupped. my leaf is flat, and appears as any other healthy leaf with the exception of it being yellow with green veins. and if you look closely you can see some faint brown spotting. The burnt edges are from an earlier calcium problem. the leaf yellowing is all recent.

another picture from the same plant.

 

[Blackvelvet]

magnesium defiency ok. can i foliar feed w/ epsom salts to fix it?? or whats best solution?

How long ago have the plants been in this soil mix and did it include dolomite lime? Is there magnesium in your fert water? If magnesium is low, calcium may also be low. The hps light makes it hard to really see the yellowing if it is occuring. Pics with normal light might be better. Whats your ph? Low ph may be linked to low mag.

Magnesium def remedy: spray both sides of the leaves with 1 1/2 teaspoons per quart of epsom salt or drench the soil with 1 teaspoon epsom per gallon of water. Foliar feeding doesnt feed the roots mag so drenching the soil is probably better. Both of these are 1/2 rate. Even if wrong, this won't hurt the plants.

Magnesium def can have burned margins and upcurled margins along with green veins and a yellow leaf. Sometimes not. When a deficiency occurs, not all plants respond in the same way although they may have similar symptoms.

 

[Blackvelvet]

Check out the magnesium deficiency growfaq

Check out the magnesium deficiency growfaq

the leaves curl upwards like they're praying? They're praying for Mg!

http://www.google.com/search?q=cach...magnesium+deficiency&hl=en&ct=clnk&cd=5&gl=us


I think i fixed the link above...

 

[Blackvelvet]

they are curling in a bit. no yellowing..yet

I might have to agree with mtf sandman and call it heat stress if your not getting green veins and a yellow leaf. Post some pics using normal light cause the hps is playing tricks with my eyes possibly.

 

[nuteburn]

yo smoke...what ferts are you using??

 

[Guest]

Ok, i fed the soil with the epsom salts.. didnt foliar feed
the light is about 2 feet from the tops

i use promix soil with dolomite and extra perlite added. maybe i should of added more dolomite when i was mixing.. and i use pure blend pro nutrients. been using light doses of it since i started feedin.
ph of water runoff is 6.5

i think i did all i can do right now. i just need to wait and see the plant respond

thanks for the help everyone
peace

 

[Guest]

Yes, the curled up "boating" effect is due to heat stress, I see this alot in my room when my A/C goes on the fritz.

Are you using a fan?

 

[Blackvelvet]

Runoff ph is high. optimum ph in promix is 5.6 to 6.2 I feel like we rushed into giving the plants some epsom. Luckily, epsom wont harm plants. ARe you getting yellow leaves with green veins on the bottom leaves or are my eyes playing tricks on me with the hps light? I let somebody else look at your plants and they saw the interveinal chlorosis too. Pure blend pro is low in cal mag. AFter repeated waterings, dolomite might be getting low. This requires the addtion of more cal mag in your water like cal mag plus to boost levels.

 

[Blackvelvet]

Growfaq picture

Growfaq picture

Here is a plant "praying for magnesium". Notice margins curling upward and in. Just thought this was interesting...

 

[Verite]

Why would anyone call out a magnesium deficiency without asking first what the plant had been recently fed and if the grower is using tap water, and what their ph is? I would say rookie mistake but theres a difference between rookie and never have grown weed before.

 

[Nikijad4210]

Why would anyone call out a magnesium deficiency without asking first what the plant had been recently fed and if the grower is using tap water, and what their ph is? I would say rookie mistake but theres a difference between rookie and never have grown weed before.

I agree there, it's pretty stupid to make that kind of diagnosis without knowing all the ins & outs of the grow. And yet, if I read that right, BV even had the balls to say Epsom wouldn't harm the plant. Bull, it can kill it very easily.

From post #2 in Stitch's Sick Plants Guide thread:
http://www.icmag.com/ic/showthread.php?t=11688

Excessive levels of magnesium in your plants will exhibit a buildup of toxic salts that will kill the leaves and lock out other nutrients like Calcium (Ca). Mg can get locked out by having too much Calcium, Chlorine or ammonium in your soil/water.

Too much Mg can lead to a "broken record" nute lock problem that can very quickly turn next to impossible to fix before a plant dies.


Threadstarter, to be honest, I agree that it's hard to tell coloring with the yellow lighting, it needs to be taken in normal light to get the full picture (pardon the pun)

To get you a proper diagnosis, we need to know what you're feeding them, what the PH is, what type of soil it's in, and where the water you use comes from.

 

[Guest]

ok better pics then, same conditions remain as before
-ok i use adjusted tap water. 6-6.5
pure blend pro nutes, but i gave it light doses every other watering.
-soil i use is pro mix, with extra perlite and dolomite
-temp is 75
-HID is 2 feet from tops

diagnosis?

 

[skin]

heat stress ? looking at the dry brown bits , they look burnt !

 

[Guest]

only 75 degrees, fans blowin fresh in/out
HID is 2 feet from tops. i dont think its heat stress