Yellow leaves. Any tips? have pics.

Have 3 plants with yellow leaves at the bottom and on one of them it looks like its moving up a bit. Is this a N problem?

Thanks for any help.

starting from the bottom , and slow onsetting , id say low ppm ... check ur ppm from a soil runoff and get back to us

good answer projectinfo. I would agree based on those pics. looks like N, with maybe Mg and K. state ur ferts and dosages

thanks buddy, +rep

Well im currently too broke to buy a ppm tester. As far as my ferts go i havent used any so far. 5th week of veg on the largest plant i have and the other 2 plants with yellowing lower leaves are only in their 4th week. I used MG soil but it was the "organic choice" so its not so heavy on the fert and i added alot of sand and perlite if that matters

u need ferts asap , and maybe a ppm meter if ur new to this, god iuno how to guesse ur soils ppm lol anyone elese have ideas ?

oh and the fert i do have is schultz 10-15-10... havent used it yet. should i find something with a higher N or is it worth giving it a shot with what i have?

alright ill go see what i can find as far as 20-20-20 goes. last time i chekced and this was at lowes i couldnt find anything that was 20-20-20. the closest thing to it was mg tomato food and its 18-18-21. if i cant find 20-20-20 should i just use the mg tomato fert?

u shouild go to ur hydro store and buy real nutes.... ack yeah u can but it will reflect onto ur bud