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NUTRIENT LEVELS
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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:
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Nitrogen* 50 ppm (approx. 95 lbs/ac = 105 kg/ha)
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Phosphorous 34 ppm (approx. 64 lbs/ac = 71 kg/ha)
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Manganese 27 ppm (approx. 50 lbs/ac = 55 kg/ha)
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Zinc 12 ppm (approx 23 lbs/ac = 25 kg/ha)
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Organic Matter
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*Nitrate forms of nitrogen are
preferable to ammonium forms especially in peat mixes.
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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.
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As a general guideline for citrus,
the University of California suggests applying 1/3 or less the recommended rates of
ammonium nitrate and superphosphate.
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We recommend the use of low phosphate organic fertilizers with BioVam such as Biosol
6-1-3 or Biosol Mix 7-2-3. 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 as Ironite or Planters II. 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.
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PRECAUTIONS
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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.
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Mycorrhiza cannot survive levels of
steam pasteurization and fumigation which are normally required to eliminate common soil
pathogens.
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Certain fungicides can also inhibit
inoculation including: Arasan, Benomyl, Botran, Mylone, and Thiabendazole.
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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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