yellow leaves?????????

[sc0usa]

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?

[sc0usa]

oh yeah,im using a hydroponics kit with rockwool and my lamp is a 400 w growell,help me plz

[bonbon]

does power-gro contain any mg?they should not turn yellow at just 4WKs,if not, add 1/4tsp of epsom salt per gallon of water in the reservoir....bonbon

[sc0usa]

what is mg?if it is magnesium then yes it does,ill have some Vita Link Grow tommorow,will that help?..............thanks for replying:)

[bonbon]

how often do you replemish the res?as the plant grows they require more ferts a little more often,are they getting the full doseage for their age....bonbon

[sc0usa]

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

cu around

[bonbon]

a good EC or PPM meter takes away the guesswork..good luck....bonbon