6.3-6.8, your lower value would be appropriate for a hydro operation, not soil.

As long as we are discussing it, what made you decide on 16 hours? Veg is typically done at 18 hours or even 24 hours and with experiments that I have done here, you do get more growth with the longer light cycle. Personally I like 18 hours of light, as it maximizes the available light, but still gives the roots time to grow during the dark periods.
emilya Reviewed by emilya on . what do you think hi guys first time grower here i have 6 25watts 6500k cfl daylight bulbs to two plants both now have seccond set of leaves on then and look very healthy i think soil is 6.8ph water putting in is 5.6ph havent added any nuits to it as dont no what type to use and when to add them temp is 26-30c one is at one week from germanation other is at 2 weeks from germanation Rating: 5