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Mycorrhizal inoculation is usually most responsive at low fertility levels. To assure inoculation the University of California recommends that the nutrient levels should be below at least one of the following with the phosphorous level being the most critical:

Nitrogen* 50 ppm (approx. 95 lbs./ac = 105 kg/ha)
Phosphorous 34 ppm (approx. 64 lbs./ac = 71 kg/ha)
Manganese 27 ppm (approx. 50 lbs./ac = 55 kg/ha)
Zinc 12 ppm (approx. 23 lbs./ac = 25 kg/ha)
Organic Matter    

*Nitrate forms of nitrogen are preferable to ammonium forms especially in peat mixes.

Response to Mycorrhizal inoculation along with fertilization has often been positive even at normally recommended application rates (nutrient levels higher than those suggested above). However, Mycorrhiza can be most beneficial at low, fertility levels - increasing growth rate, plant quality, and survivability and at the same time reducing fertilizer, material and labor costs.

As a general guideline for citrus, the University of California suggests applying 1/3 or less the recommended rates of ammonium nitrate and superphosphate.

We recommend the use of low phosphate organic fertilizers with BioVam such as biosol forte 7-2-1.  This particular fertilizer will feed organic material and low levels of nutrients to the Mycorrhiza and will enhance the Mycorrhiza growth as well as the growth of your plants.  If you can’t obtain Biosol locally, you can substitute cottonseed meal (6-2-1).  We also urge you to amend your soil with Gypsum and with minerals such Planters II, Lime, and Soft Rock Phosphate.  Mix these products all through your planting beds before planting and apply once a year as a top dressing around your plants.  Use 1/3 less than the manufacturer’s recommended application rate.


Important note:  Once you treat your plants with BioVam mycorrhiza, you need to inform others who may decide to fertilize your plants that they are not to apply fertilizers that are above 2% phosphorous to your BioVam treated plants.  Such fertilizers, especially where the phosphorous is soluble, can result in your plants drying up and dying rather quickly.   You may think you are the only person who will be caring for your BioVam treated plants, but everyone in your household who has access to those plants needs to clearly understand this important rule.

Mycorrhiza cannot survive levels of steam pasteurization and fumigation which are normally required to eliminate common soil pathogens.

Certain fungicides can also inhibit inoculation including: Arasan, Benomyl, Botran, Mylone, and Thiabendazole.

Other fungicides, in selected studies, have shown little or no effect on infection and development of endomycorrza. These include: Ethoprop, Funsophothian, Ethazole, Captan, Maneb, Ridomil, Aliette, Pyroxzyclor, and Thiophanate. Some fungicides such as Ethazole (Terrazole and Truban), when applied at low rates (10-40 ppm) and at 30 to 60 days after inoculation can stimulate Mycorrhizal infection.

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