I go with choice "a", but only after learning to read ur plants. Ihave NEVER ph.d...i just so happend to post a big comment in my thread on this if any of u guys feel like checking it out, or copying and pasting it here.
i am not sticking my private parts in there, without a good ph reading btw i have had a few outdoor grows over the years, and two indoor grows, and no ph meter. but i think i will see if hanna is on the big board at the stock exchange.............. and make an investment!
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