some1 just whispered me and they recon i need a meter for the nutrients but thanks for taking the time to help

cu around
sc0usa Reviewed by sc0usa on . yellow leaves????????? hi ppl can ne1 help me? my plants are about 4 weeks old now and all of the bottom leaves are turning yellow quickly,my ph is 5.5 and i have a fan on so they are not burning , but im using "power-gro" nutrients, its says it has nitogen in it so can ne1 tell me what im doing wrong? Rating: 5