Yellow and curling leaves..deficiency of..?

Dink · #1 05-19-2008, 10:39 PM

Im growing 3 plants in a room in my basement.. They're about 5 wks along and in the span of a few days have started turning yellow and curling up. I water when they seem kind of dry and i spray them regularly..i think its some type of deficiency, but i dont know which one.. i thought the light was too close so i moved it to about 22 inches above the top leaves..Any help would be greatly appreciated.

SmokeAronAnonAthon · #2 05-19-2008, 11:03 PM

its either nitrogen or magnesium flush with clean water for a day then use some sort nutrient also add 1 tbsp of epsom salt per gallon of water this will wash away un used chemicals inside the plant and make for good absorbtion of the nutrients

pacman · #3 05-19-2008, 11:05 PM

i think its potassium just readin a little and thats what i think but don't flush or add anything until u know exactly what it is

SmokeAronAnonAthon · #4 05-20-2008, 12:51 AM

Quote:

Originally Posted by pacman

i think its potassium just readin a little and thats what i think but don't flush or add anything until u know exactly what it is

you have a point about not flushing but check it, i know my shit man.

Potassium (K)Potassium is involved in maintaining the water status of the plant and the tugor pressure of its cells and the opening and closing of the stomata. Potassium is required in the accumulation and translocation of carbohydrates, Lack of potassium will reduce yield and quality.

Potassium deficiency (K).
Older leaves are initially chlorotic but soon develop dark necrotic lesions (dead tissue). First apparent on the tips and margins of the leaves. Stem and branches may become weak and easily broken, the plant may also stretch. The plant will become susceptible to disease and toxicity. In addition to appearing to look like iron deficiency, the tips of the leaves curl and the edges burn and die.
Potassium - Too much sodium displaces K, causing a K deficiency. Sources of high salinity are: baking soda (sodium bicarbonate "pH-up"), too much manure, and the use of water-softening filters (which should not be used). If the problem is Na, flush the soil. K can get locked up from too much Ca or ammonium nitrogen, and possibly cold weather.
Potassium (K) Toxicity
Usually not absorbed excessively by plants. Excess potassium can aggravate the uptake of magnesium, manganese, zinc and iron and effect the availability of calcium.

first 2 pics are (k) problems over and under

Magnesium

Magnesium is a component of the chlorophyll molecule and serves as a cofactor in most enzymes.
Magnesium (Mg) deficiency.
Magnesium deficiency will exhibit a yellowing (which may turn brown) and interveinal chlorosis beginning in the older leaves. The older leaves will be the first to develop interveinal chlorosis. Starting at leaf margin or tip and progressing inward between the veins. Notice how the veins remain somewhat green though as can be seen in picture 3.
Notice how in picture 3 and 4 the leaves curl upwards like they're praying? They're praying for Mg! The tips may also twist.
This can be quickly resolved by watering with 1 tablespoon Epsom salts/gallon of water. Until you can correct nutrient lockout, try foliar feeding. That way the plants get all the nitrogen and Mg they need. The plants can be foliar feed at ½ teaspoon/quart of Epsom salts (first powdered and dissolved in some hot water). When mixing up soil, use 2 teaspoon dolomite lime per gallon of soil.
If the starting water is above 200 ppm, that is pretty hard water, that will lock out mg with all of the calcium in the water. Either add a 1/4 teaspoon per gallon of epsom salts or lime (both will effectively reduce the lockout or invest into a reverse osmosis water filter.
Mg can get locked-up by too much Ca, Cl or ammonium nitrogen. Don't overdo Mg or you'll lock up other nutrients.
Magnesium (Mg) Toxicity
Magnesium toxicity is rare and not generally exhibited visibly. Extreme high levels will antagonize other ions in the nutrient solution.

2nd 2 are low on (Mg) no pics of toxicity its never happened to me

shenagen · #5 05-20-2008, 07:56 AM

poof......

shenagen · #6 05-20-2008, 08:34 AM

It is either a zinc or mag. def.

SmokeAronAnonAthon · #7 05-20-2008, 08:54 AM

Quote:

Originally Posted by shenagen

It is either a zinc or mag. def.

ok so ive noticed when your are contradicting me on the forums (not that i mind cause

) but you are changing the smallest thing then reposting pretty much the same thing if your here, in the "plant problems" forum expect other people to know more than you. "su impudencia es inaceptable la ira de los nueve reyes del infierno desciende sobre usted" mwahaha figure that out anyways no more bickering with you from now on cause your a

potroast · #8 05-20-2008, 11:56 AM

Quote:

Originally Posted by SmokeAronAnonAthon

you have a point about not flushing but check it, i know my shit man.

Quote:

Originally Posted by shenagen

It is either a zinc or mag. def.

Yeah, both you guys really know what you're talking about. You're telling a guy that his 5 week old plants have a deficiency, without actually finding out anything about his plants. Are they soil or hydro? What kind of soil? Has he fed them yet? You just say it's a deficiency, but you're not telling him why. He said he sprays them regularly, and spraying with water will flush foliage of nutrients. So instead of spouting a lot a crap that you barely understand, and acting snippy towards other posters, why not help the guy?

Dink, if your plants have a nutrient deficiency, it's probably nitrogen, and the cause is spraying the foliage. If you spray, use a very dilute veg nutrient, and only spray every few days.

HTH

Dink · #9 05-20-2008, 02:24 PM

Thanks man. I appreciate that. So basically STOP spraying them and they should recover.. Also i'm using a tomato soil mixed w/ some sand. I'm using Tetra Verra nutes and just started those about a wk ago. When should i start the 12/12 light schedule?

shenagen · #10 05-20-2008, 05:43 PM

Quote:

Originally Posted by potroast

Yeah, both you guys really know what you're talking about. You're telling a guy that his 5 week old plants have a deficiency, without actually finding out anything about his plants. Are they soil or hydro? What kind of soil? Has he fed them yet? You just say it's a deficiency, but you're not telling him why. He said he sprays them regularly, and spraying with water will flush foliage of nutrients. So instead of spouting a lot a crap that you barely understand, and acting snippy towards other posters, why not help the guy?

Dink, if your plants have a nutrient deficiency, it's probably nitrogen, and the cause is spraying the foliage. If you spray, use a very dilute veg nutrient, and only spray every few days.

HTH

OK...I know what you're saying roast...but yes of course I'm telling him he has a deficiency, he does. Five weeks is plenty of time for a def. to show up. You are the right one...I didn't even think about spraying being the prob. He obviously is growing in soil, I'm not spouting a load of crap, he asked what def. so I said just that. And yes I was being very snippy with dude...which I shouldn't have(Aron if you read this before I get to send a PM to you, I'm sorry) Sorry to you too Dink...I was too caught up with Aron, I didn't pay enough attention to your info. I never start crap on this site either...don't know why I did today. But hey look on the bright side...Potroast is on the case now. He can answer anything you want to know.