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smdexter said:
Hi guys,
It's my first time growing and I have some problems. I'm growing 4 Ladies and it seems that I've kind of problem with 3 of them. They are Arjan's Ultra haze 2 and forth one is Critical. I'm growing them from seeds and for the AUH2 is their 5th week. With the critical I haven't got any problems and it's growing faster.
I'm using this soil.The light is 125 W CFL Dual Light. The temperature is 18 -22 C. The ventilation is good enough I think.
Since now I haven't put any additional nutrition.

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First off, welcome to the Growery!

What is the pH of the water the plant is receiving? Is it tap-water? If the water isn't being adjusted down to the right range, which I notice is listed on the page with your soil, then the chemistry of your soil and roots is not going to be balanced properly, and you're going to have problems with some nutrients getting locked-out. It kind of looks like that is what is happening.

If not that, then there might be an issue with the soil itself. It mentions that has a lot of nutrients that should last for weeks, and also that it only releases them when they are needed. The last part could be a problem, but since the other strain is doing fine and I'm assuming that it is more indica-dominant (who knows though, that website doesn't list any descriptions and is mostly selling strains named after other popular strains, which suggests its pretty much a knock-off site that is growing out other people's stuff, crossing it against itself once, and then selling the beans), it might just be that the Arjan's Ultra Haze 2, a much more sativa-dominant strain, is more sensitive to the nutrients the soil has.

The best thing you could do right now is to give the soil a good flushing, with an amount of water that is several times the size of the pot, making sure to adjust the pH of the water within the range of 5.8-6.2 (probably closer to the 6.2).

Also, to go further ahead a bit, a good thing to keep in mind when growing with CFL's is that they have a much lower intensity than HID lighting, which means that, from a certain distance away from the bulb, the light is going to be ineffective as far as the plant is concerned. When you put the plants into 12/12 for flowering, they are going to stretch in height about two to three times the size they were when the light cycle was changed. The plant really shouldn't be bigger than 2' tall, and considering how many weeks yours are in, it might be a good idea to make the change. The bulbs also shouldn't be more than 3" away from the tops of the plants, but you'll need to pay attention to the amount of heat.

What is a Dual Light? Also, what is the color temperature?