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Old May 27, 2009   #18
dice
Tomatovillian™
 
Join Date: Jan 2007
Location: PNW
Posts: 4,743
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You could use rock phosphate instead of bone meal. On paper
the phosphate levels are lower, but mycorrhizae exude
chemicals that break the chemical bonds in phosphate rock,
and they can transfer 6 times as much phosphate into the roots
via their hyphae as the roots themselves can absorb via
diffusion over the same amount of time. (So you don't need as
many roots in direct contact with phosphate in solution to get
the same amount of phosphorus into the plant if the roots are
colonized by mycorrhizae.)

It lasts longer in the soil, too, for years.
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Last edited by dice; May 27, 2009 at 10:20 PM. Reason: clarity
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