Problem with leaves

[RacingHartPurpl]

Don't have any pics yet, will try to get some tomorrow. I've been using straight water for the past 2 weeks. Gave them 1 tbsp/gallon of epsom salt today. The tips of the leaves are turning yellow and curling up. The outside of the leaves are yellowish and they are v shaped almost like they are praying. It starts with the top leaves and works it's way down. I'm wondering what is causing this. I have about 8 plants and it only shows signs on 3 of them. Have been watering them on the same cycle. Are these symptoms of Magnesium deficiency? How often should I be watering them with epsom salt. Will try to get some pics tomorrow, any info is appreciated.

*Edit* *More thorough*

i have 10 purple powers under a 1000w MH, mylar, some fans, minimal nutes lately... dont know the soil pH but have a tester coming in the mail... out of the 10 plants, 3 look gorgeous, 4 look pretty good, and 3 look pretty bad. They are all in miracle grow "feeds for 3 months" soil, (which i know many people here recommend against, but its in the process of being phased out before the next generation). The 3 that look bad all share the same exact characteristics. Whereas the healthy ones have healthy looking primary fan leaves and normal amounts of secondary undergrowth, the unhealthy ones are all tall, with all the primary fan leaves appearing healthy EXCEPT the top 2-3 pairs. The symptoms shown on these upper 2-3 pairs is also exhibited all the way down the stem on ALL the well-underdeveloped secondary branches(which remain lookin only like small budsites attatched to the central stalk). I say underdeveloped as compared to the other 7. The symptoms are that the outer edges of the leaves are slowly yellowing, the tips of the top leaves (not quite the secondaries) are curling and browning, and some slightly browning/crisping also occurs on the very edges of SOME leaves. The upper pairs of fan leaves are also particularly dry-feeling and somewhat curl inward in that "venus fly trap" style. I will have some pics to update into here eventually but for now this is the best description i can offer. I figure, given its specificity, that its an easily identifiable problem-- just need someone's help who knows their nute lockouts/burns...


ps. we've watered those plants along w/ otheres with the correct concentration of epsom salt water a few times in the last 2 weeks thinking it was a Mg deficiancy, who knows though...


any help is appreciated, but please only suggest a plan of action if you feel confident you know what this problem is.

[RacingHartPurpl]

Here is a picture from two weeks ago. It looks a lot worse now, you can see what I'm talking about a little bit here.

http://forum.grasscity.com/showattac...acingHartPurpl

another

http://forum.grasscity.com/showattac...acingHartPurpl

[Lucian]

Hey RHP,
Yes, I would agree would the plants having a MG deficiency, leaves curling up from the centerline is the main symptom; "praying leaves." I can't remember if it is a 1/2 teaspoon or 1 teaspoon per gal. of water but I usually mist the leaves till they are dripping and then remist 2 days later if needed. Anyway, since you watered them, just water on your usual schedule with epsom salt added so you don't wind up overwatering. It shouldn't take more than 2 times I would think but it takes longer than misting. Good Luck

[RacingHartPurpl]

new pics from today...ugh, they are getting worse, anyone have any suggestions? Been watering with epsom salts, but it doesn't seem to be making much of a difference.

[RacingHartPurpl]

[bluebong]

Well, they''re all deffinitely nute burned, likely from the soil, and there is what looks like a MG defficiency, but I'm willing to bet with all the stuff you've been adding you're more likely risking a toxicity. Switch to plain water ASAP.

The people who told you not to use that soil were right.

[RacingHartPurpl]

Originally Posted by bluebong

Well, they''re all deffinitely nute burned, likely from the soil, and there is what looks like a MG defficiency, but I'm willing to bet with all the stuff you've been adding you're more likely risking a toxicity. Switch to plain water ASAP.

The people who told you not to use that soil were right.

Thing is we haven't given them nutes in awhile, I'd say 3 weeks, and even when we did nute them it was a very little amount. The Epsom salt doesn't seem to be making a difference, so I might just try straight water for a little while.

[bluebong]

Scotts has nutes that break down over a 3 month span, and provide more of a concentration in the soil than most plants can handle. By adding nutes to that soil, the concentration shot up even more. And since the time-release nutes continue to break down with every watering, that concentration doesn't really go down.

By adding epsom salts or anything else at this stage, you will only further increase the ppm in the water available to the plants, forcing them to take in toxic mounts.

[SmknVTEC]

I agree that they are nute burned. Your Epsom salt is not working because MG is not the problem. I could not find where you said you had Scotts with time release but if that is the case then I would recommend you transplant into different soil if you want them to get better.