Good information to know. I assume (uh oh) that includes both beneficial and pathogenetic mycorrhiza? Mike On Sat, Feb 6, 2016 at 9:44 AM, penstemon <penstemon@q.com> wrote: > I assume (I know what happens when I assume) that most people who grow > bulbs in pots add fertilizer at one time or another. > > “The benefits of mycorrhizae are greatest when soil phosphorus levels are > at or below 50 ppm (50 mg kg -1). Mycorrhizal infection of roots declines > above this level with little if any infection occurring above 100 ppm P > even when soil is inoculated with a mycorrhizae mix.” > > > http://mining.state.co.us/SiteCollectionDocuments/… > > > Bob Nold > Denver, Colorado, USA > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/ _______________________________________________ pbs mailing list pbs@lists.ibiblio.org http://pacificbulbsociety.org/list.php http://pacificbulbsociety.org/pbswiki/