Need A Few Pointers

So this is my grow its under a 250 watt HPS and im using 24-8-16 NPK for veg but why is my leaves on my big girl turning yellow and dying at the bottom up i only water when needed and fert every two weeks

looks like nothing leaves die naturally and fall off, besides that your plant looks really healthy. keep up the good work

I disagree. It looks like you have a nitrogen deficiency or lockout. You should get a ph kit to test the ph of your water that you feed with as well as soil runoff. I ran my first few grows, without, and I had all kinds of problems. Now that I ph test and correct my water...it's been alot easier. You can actually get all of these from a local pet store. The aquarium ph test kits are sufficient to start out with and they also have ph up and down. PH is super important. You are shooting for a range of 6.5 for soil or 5.8 for hydro. It doesn't have to be exact, but as long as you keep it somewhere close to that range, you will be golden. Other than that, your plants look nice. I hope this helps. Happy growing!!

too muck K is upsetting the apple cart, maybe. yer ferts are very high in it.

your plant looks really great besides the bottom leaves,
Lower leaves might not be getting enough light.

also what are your PH levels?
before watering,and PH of
your run off?

PH levels will determine how much of a certain nutrient
your plant will be able to uptake.

Also,people tend to run Veg nutes the first week into flowering
instead of switching to straight flower(bloom/bud) nutes right away.

1st week of flower is also like a transition phase before the plant flowers

meaning it will still need veg nutes.

but to each their own.

You got problems. Leaves do turn yellow but not at that early stage of vegging.

BigSteve.