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Messages - psychonaut

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PF - Tek / Re: help please can i sub
« on: October 28, 2008, 02:40:09 AM »
i learned this in my greenhouse management class.   vermiculite and pearlite sere completly diff purpose.  vermiculite is mica put through what is essentially a giant popcorn popper to expand it, the purpose is to hold as much water as possible. vermiculite is designed not to hold moisture.    if you are using the 2 in a potting mix for plants, the formula is 1:1:1 peat moss, vermiculite, pearlite. verm to hold water and pearlite to provide airspace

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