my ak-47 plants (flowering for 4 weeks) leaves are curling. they are under 600w hps using advanced nutrients and ph is 5.8 (hydroponic) room temp is around 80 constant. i wasnt really worried when one of them was turning like that but slowly my other plants are curling up too. Please HELP!?!
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Heat stress? Or over nuted? Light too close?

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-- just a thought--

its not over nute but maybe heat stress? but its only 80 degrees or is there any other factor in heat stress?

Looks like they're "praying" for magnesium in my opinion. Are you using the Advanced Nutrients Grow-Micro-Bloom? If so, what ratio are you using? The magnesium is in the Grow, so if you aren't using any Grow during flowering you may want to add some (say a 1:2:3 ratio of Grow:Micro:Bloom) and/or supplement with epsom salts or cal-mag.

You can also try foliar feeding with the epsom salts (1 tsp/gallon) to see if your plants pick up if you don't want to fart around by adding it to your res. Make sure you don't spray any water around the lights when they're on though (cold water/hot glass/not good).

im using sensi part 1&2 so still 1:2:3? npk?

Im going to say the light is to close and not enough air circulation at the top of your plants. if your misting your plants stop untell you correct the heat problem, misting will burn the leaves faster. i always have a temp gage it the tops of my plants. you could also suspend a temp gage from a string from your light for a couple of hours and see if your cooking them.

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Like others have said, I would suspect heat stress first, maybe the leaves are curling upwards to conserve moisture. Have they been drinking more or less water than normal? Do the leaves have a bluish or grayish tint? Are the leaves dry feeling? How do the roots look?

As far as mag deficiency, it's hard to tell what color your leaves are in the pictures due to the HPS light and you don't have any pictures of the whole plant so I can't tell for sure. It's easy enough to test though. Pick up some epsom salts for a couple of bucks from any drug store, mix about 1 teaspoon per gallon of water, put it in a spray bottle, pick an inconspicuous spot on one of your plants that's displaying the symptoms, foliar spray that area once a day and see if that area picks up.

I don't know much about the Sensi series of nutes or what ratios to mix them at...isn't that like a 4-part? Anyways, look on the labels and see which part has the Mg and make sure you're giving the plant an appropraite amount.

Make sure it's not a heat problem first, though...good luck!

i think its heat stress.. i misted them couple times this week and curling... ill circulate more air and move the light further and see what happens... thanks

this should cure your problem it wouldnt hurt to flush your soil or system also. I think this helps alot to stressed plants

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