curling leaves question

[mountainman]

How quickly should the plant improve? Will the leaves get better? Or will new leaves just be healthy?

mountainman Reviewed by mountainman on 02-26-2006. curling leaves question When leaves start to curl up, that's too much water, right? I'm in rockwool with a weak solution of nutrients and Earth Juice Catalyst with some silicates. Any ideas/help? Rating: 5

[mountainman]

Thanks alot for your help, Swizzy. So here's what I've got/done:

Current nutrients list (25 gallon system):
10 mL/gallon of Fox Farm Grow Big
5 mL/gallon of Earth Juice Catalyst
25 mg/liter Sodium Meta Silicate
1 teaspoon/gallon Epsom Salt

I haven't really seen any improvement in the leaves, and there's now actually some downward curling on some lower large leaves that's visible in these pics. However, new growth seems to be coming in fine. The current ph is just above 6.05.

I measured, and at the current height there's about 6-7 inches between the plant and the HPS reflector, with 13 inches from the plant to the light bulb. I haven't changed the height of the reflector at all yet. Maybe raise it 6 inches?

[latewood]

you can buy epsom salts in any grocery store, pharmacy,wal/Kmart...anywhere...1-2 tbs in res with water change for magnesium...

Do you use ROwater/distilled or tap/well water? If Ro/dist...then you need calcium and magnesium replenished in the water, as above process removes minerals,etc.

Just buy Botanicare Calmag+ and be done with it.lw under 20 bucks! Problem solved!

[mountainman]

latewood, I use tap water. Any suggestions?

[latewood]

Lol shes not wilting, when I took Fiona out and put her on the windowsill to enjoy some natural light she cleared right up. Im thinking it was a heat problem or something, but thats sorted now.

Leaf curling up can be a sign of a Magnesium (Mg) deficiency caused by too low of a pH level. Magnesium deficiency will show as a yellowing (which may turn brown and crispy) and interveinal yellowing, beginning in the older leaves. Interveinal chlorosis - in laymans terms, yellowing - will start at the leaf tip and progressing inward between the veins. It could also be a sign of excess heat and humidity in the grow room.
You need to check and adjust the pH level (Im sure youve done this). When the pH is not at the proper level marijuana will lose its ability to absorb some of the essential elements required for healthy growth. If youâ??re growing in soil, Magnesium will begin to be locked out at a pH of around 6.5 and lower, in hydro it starts at 5.8 and below. If the pH is correct, then add 1 teaspoon of Epsom salts per each gallon to your water. Or, if you prefer to foliar feed them, add a ½ teaspoon per quart to a spray bottle.

Tell me if that worked or not! Epsom Salts ban be bought at a chemist, I bought a big 250g tub for about £2 (around $5)

"rusty brown spots between dark green veins and on tips, leaf tips curl up before dying"*TIB...
these don't appear to be in that condition.

1st let me say, I agree PH levels can start can be part of the start of your problem...But now...

It looks like A phosphorous deficiency...Q, Are the leaf stems or under side reddish/purple? do the older leaftips darken and turn downward? You appear to be in the middle stages of a phosphorus def. and if it gets worse, leaves will develop dead blotches/bronze/purple, shrivel and...fall off.

Oh, For epsom salts value; I said 2 tbs per res change in other post. After researching your problem, I found that the recommended value is 2 tbs* per gallon...:thumbsup:

*Important note: You must dissolve dosage of epsom salts for a few hours (in a couple gallons of water) before adding to entire mix! Very important!

hope this helps.lw:smokin:

[latewood]

So. what do we do for a phoshorous/phosphate deficiency?
Oh yeah, another contributing factor is Acidic conditions...ph, again

Now I could be wrong about def. Awaiting other's to chime in on this one...

[latewood]

Epsom salts have a VERY high content of magnesium. Dont know about them stunting growth though

most experts state that they don't really know how much is too much, within reason, but, to err on the side of less is more; Is safer. :thumbsup: Imho.lw

[latewood]

Thanks alot for your help, Swizzy. So here's what I've got/done:

Current nutrients list (25 gallon system):
10 mL/gallon of Fox Farm Grow Big
5 mL/gallon of Earth Juice Catalyst
25 mg/liter Sodium Meta Silicate
1 teaspoon/gallon Epsom Salt

I haven't really seen any improvement in the leaves, and there's now actually some downward curling on some lower large leaves that's visible in these pics. However, new growth seems to be coming in fine. The current ph is just above 6.05.

I measured, and at the current height there's about 6-7 inches between the plant and the HPS reflector, with 13 inches from the plant to the light bulb. I haven't changed the height of the reflector at all yet. Maybe raise it 6 inches?

This is the symptoms of phosphorous def. I was talking about. Do you have earth bloom? I looked up your nutes you could add 1/2 value of grow and 1/2 value of bloom...this would up your -P- values with out changing you veg nutes, too much. imho.

You know? another concern that I have is, overferting...those plant are still kinda small...Are you sure that they can handle full strength...Now you need some -P-...but, you might be better flushing for a day, then starting with a 50-50 blend of grow/bloom at 50% strength...sorry, I'm just loving this thread.
Might be the Nice fatty, :smokin: burnt

[latewood]

latewood, I use tap water. Any suggestions?

yeah...I have several: I will go by best/msot expense to alternatives, by value/expense...
1st go to ebay and buy the 80 dollar ROunit...devoneb is the maker of mine...and despite nay'sayers...I will tell you, straight up. It works just as good as the 300 dollar one at sears...Same* componenets same filter...probably made by a guy like me,(fabricator) but, in the plumbing business, that grows pot...found a market and the easy availability of filter parts, opened ebay store...you see where I am going with this?

alternative 1...go buy a few 2.5 gallon distilled water...then re-cycle; you can make little bubblers out of the empties and clone away...another thread.

alternative 2...boil water or let it sit 24 hours to get rid of chlorine/and other nasties (unwanted bacteria), found in tapwater...

what are you using the silicates for? I forget.

[mountainman]

Holy crap latewood! I left for a couple hours to buy a new ipod and you post a zillion posts. Thanks! :-D I'll reply over the next hour or so, but first I gotta get my new baby syncing. lol

I have some Tiger Bloom which is higher in phoshorus, I could use that. The Foxfarm is mixed at the weakest suggested concentration.