Discussion in 'Growing Organic Marijuana' started by lighterfields99, Jun 14, 2013.

  1. what kinds of things can cause harm to the mycorrhizae in a plants roots?
    do they need to have a food source added to the soil to survive?

  2. yes. it did not really specify beyond potential issues with trichoderma...
    I was wondering more about which chemicals cause harm. for instance I know that hydrogen peroxide will kill them.
    it also does not mention what the mycorrhizae feed on and/or what should be added to the soil for that purpose.
    Excessive phosphorus (P) in soil is most harmful to mycorrhizal fungi. You'll get the most benefit from using a VAM product if soil P levels are < 50 ppm. The higher the P levels in a soil, the less effective a VAM product will be.
    From this site :

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