Plant is dying, absolutely no idea why.

Something's wrong with my plants, and frankly, I don't know how can I help them. I checked all typical growing problems, but I don't think any of these apply. I am stumped, one of my younger plants already died, and the one left is getting worse by the hour.

The plants are visibly drooping, drying up, and shriveling. Leaves are green, save for the two small yellow shriveled-up leaves that can be found at the bottom of the plant.

See pictures:
http://imagesocket.com/thumbs/bue1b31.jpg
http://imagesocket.com/thumbs/bue289c.jpg

This plant is approx. 2 weeks old and was perfectly fine until 2 days ago.

The plants are under a 150w HPS bulb, are grown indoors, in a small growbox. They are not, as far as I know, overwatered. pH of the soil is ideal, approx 6,9. Ambient temperature is 90 degrees fahrenheit, may be higher. The lamp was moved higher, to a very safe distance, but to no avail. Watered once a week, with ~200 ml of water. Soil is pre-fertilized.

I'd appreciate any ideas - thanks in advance.

could be heat from lights? could be not enough water (doesn't look overwatered)? do you have dainage in that pot? It could be the pre-fertilized soil too, but doesn't appear to be poisoned. Check your soil PH deep in the pot. Otherwise I dunno.

The temperature is too hot and the plant looks overfertilized. You need to get the temps below 90 or you're going to have problems. Transplant into a soil mix that isn't prefertilized. That's what I would do.

Ok, I watered the plant heavily, and checked PH. It seems that the soil PH varies wildly, with ph of 7 on the surface and 5 deep inside the pot. I don't think the roots have gone there yet though. How do I go about fixing it?

EDIT: I have also bought a fan to cool and ventilate the plants. I'll try to replant them today.

Don't even try to fix the ph, just transplant it into new soil, and yes the roots are probably to the bottom by now.

I don't open piks from offsite, but I can tell you 90F is way too hot...that's hermietime, Bigtime. you need to keep them below 80 if you want to have/keep female plants...
If you attach a couple piks I will look at them, but make them around 1mb max, so they load fast...peace

Well, thanks to you all, my plant is back to life. :dance:
I am a little bit worried with two yellowing leaves (shown on pictures, two bottom leaves), but that occured when the plant was still in the old soil. Should I wait before taking any action to correct this, and give the plant time to adapt?

Btw, the seeds were bought from femaleseeds, and are said to be feminized. Is the risk of getting a hermie smaller with these seeds?

just sit on it, it should only get worse for a few more days, after that, they will stay yellow, but all new growth should be fine.

if the leaves still have a yellow problem, it's prolly a (N) deficiency. it's hard to grow good plants with hot ambient temps. it's pretty impossible without an air conditioner (most increase humidity, but hps lamps cook it out again pretty well)

Quote:

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Originally Posted by burnable

if the leaves still have a yellow problem, it's prolly a (N) deficiency. it's hard to grow good plants with hot ambient temps. it's pretty impossible without an air conditioner (most increase humidity, but hps lamps cook it out again pretty well)

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a/c units do not increase humidity.

Moist soil, water on the floor, open reservoir, transpiration- those are things that put water into the air.

Did you ever look at the back of a running a/c and notice it dripping water? That's water that has condensed OUT OF the air.

Okay heres what I have learned from this forum: For sprouts/clones you should have them under cfl's or suitable lights, not 150 hps right? I read and seen alot to tell me that they should be under cfl's for 1-2 weeks in the beginning of thier life cycle. Maybe less depending on the conditions.

Quote:

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Originally Posted by kraz

Well, thanks to you all, my plant is back to life. :dance:
I am a little bit worried with two yellowing leaves (shown on pictures, two bottom leaves), but that occured when the plant was still in the old soil. Should I wait before taking any action to correct this, and give the plant time to adapt??

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Yes. Wait. Severely damaged leaves aren't going to heal. They will probably just die off eventually. It's the new growth you want to monitor, and whether any other lower leaves start showing symptoms.

Quote:

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Originally Posted by kraz

Btw, the seeds were bought from femaleseeds, and are said to be feminized. Is the risk of getting a hermie smaller with these seeds?

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To minimize your risk of hermies, don't stress the plant.

There's a lot of discussion of this subject in the feminized seeds threads.

Quote:

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Originally Posted by Weed4Life

Okay heres what I have learned from this forum: For sprouts/clones you should have them under cfl's or suitable lights, not 150 hps right? I read and seen alot to tell me that they should be under cfl's for 1-2 weeks in the beginning of thier life cycle. Maybe less depending on the conditions.

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Yeah, HPS isn't the right spectrum. If you want to use a HID, metal halide is more appropriate.

Flouros are really nice for the seedling stage.

Oh yeah, for clones, before they are fully rooted, it's best to keep them in diffused or indirect light. But again, flouros are appropriate.