Mycorrhizal Applications, Inc. Reference Tools

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Available Phosphorous and Mycorrhizal Inoculation:

 High levels of Available Phosphorus (at the time of inoculation) do not harm the mycorrhizae, but it can slow the germination process.  One of the main functions of mycorrhizae is to extract phosphorus from the soil.  If there is already a high level of phosphorus available to the plant the mycorrhizae tend be more slow or lazy, so to speak, they have no reason to go to work.  When inoculating with Mycorrhizae it is best to keep the Available Phosphorus levels around a more natural level.  You can increase those levels 3 weeks or so after inoculation without an effect on the mycorrhizae if needed, but remember the mycorrhizae should now be helping you plant more effectively and efficiently use those nutrients already in the soil.

 Some Good Rules of Thumb for Avaialble Phosphorus when Inoculating:

• Bray: 70 PPM (parts per million) available is ideal
• N-P-K analysis of 10 or below normally preferred on “P”
• Time release and organic fertilizers normally the best
• Add mycorrhizae allow 3 weeks or more to germinate then apply fertilizers with high P values

List of Fungicides and Known Effects on Mycorrhizae

Tips for working with Mycorrhizae and Fungicides

List of Major Plant Groups Type of Mycorrhizae Required

Guide for writing Specifications