Why do leaves turn yellow?

My plant has been getting enuff water and light and i dont think its because of neutrients because the soil is pretty good and iv been giving it some, but im not god to kno evrthing so maby its not enuff . The problem is that my box has no fan and 2 florecent lamps. They dont get very hot but its still hot inside. I dont have a thermomiter right now so i cant tell if its too hot for the plant or not but could som1 tell me what happens to the plant if it grows it a hot enviroment? The very first leaves that dont look like weed leaves turned yellow and dried up alrdy and the next leaves up r turning yellow. Please help som1

some guy said:

My plant has been getting enuff water and light and i dont think its because of neutrients because the soil is pretty good and iv been giving it some, but im not god to kno evrthing so maby its not enuff . The problem is that my box has no fan and 2 florecent lamps. They dont get very hot but its still hot inside. I dont have a thermomiter right now so i cant tell if its too hot for the plant or not but could som1 tell me what happens to the plant if it grows it a hot enviroment? The very first leaves that dont look like weed leaves turned yellow and dried up alrdy and the next leaves up r turning yellow. Please help som1

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Post a pic.

IGTHY said:

Post a pic.

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I cant right now.. i will later

some guy said:

I cant right now.. i will later

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Ok if everything is running well into flowering;that yellowing happens when the flowers are using the sugars from the larger leaves to aid the buds to prosper. That also signals the plants end cycle. Now if you're in veg stage(green growth) and you see yellowing it could be a number of factors, so no yellowing during veg stage.

actually i am in veg stage. i fogot to mention my plant is small and like new and stuff. its about a month old, but for the first about 3 weeks it was on the window where theres not enuff light and only about 15 hours or so. I think its too small for a plant thats a month old, but its my first time so i dont know.. ill post some pictures as soon as i can.

some guy said:

actually i am in veg stage. i fogot to mention my plant is small and like new and stuff. its about a month old, but for the first about 3 weeks it was on the window where theres not enuff light and only about 15 hours or so. I think its too small for a plant thats a month old, but its my first time so i dont know.. ill post some pictures as soon as i can.

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How many node sites or pairs?

you could have given too many nutes or your lights could be too close man

well theres th very first leaves that are not weed leaves. they r dried up. then theres a 2 leaves opposite of eahother a bit higher(they r starting to become yellowish) after that theres more leaves a bit higher. i think its supposed to be 3 leaves on each side but there crooked or something so its more like 2 on one side and 1 on the other. and after that a little big higher theres some leaves starting to form. btw whats node sites?

hmmmmm i couldnt really see without a picture man ... as for the nodes , its where branches come off the main stem

sounds like your plant is still possibly to young for any nutes at all. try flushing the soil next time you water them, just keep pouring water into the soil till it starts running out the holes in the bottom of the container and do it again when the soil dries. if your plant is old enough (at least 2 weeks) try feeding a half strength solution. there that should solve part of the problem. as for the heat, YOU MUST HAVE SOME SORT OF VENTILATION. even if its just a hole cut at the bottom and top of your growing area to allow cool air to flow in and hot air to flow up and out. plus if there is no circulation there will be some serious CO2 deprivation...

you MUST get a thermometer even if its a fairly cheap one and as the last guy said ventilation is a must, preferably a fan in and a fan out if growing in a small space with hot lights.
(You could try a cool tube or a GOOD led (magnum 357) if you have the cash)
As for nutrients, i always plant in bio bizz soil which needs no nutrients for the first month, then i add quarter strength for the first week, half the next, and full the week after until the end. (Flushing with water only the last week)
This seems not to shock the plant so much. I always get a few yellow leaves about half way through flowering, but just pull them off.
Good Luck