General tips:

Agriculture: 

High concentrations of available phosphorus at the time of inoculation do not damage the mycorrhiza, but can slow down their spread. One of the most important functions of mycorrhiza is to absorb phosphorus from the soil for the plants. If sufficient phosphorus is already present, the mycorrhiza works more slowly. Before inoculation, the phosphorus levels should ideally be close to a natural concentration.
After about 3 weeks, the concentration can be increased again if necessary without affecting the mycorrhiza. However, it should be borne in mind that plants with mycorrhiza can still make better and more efficient use of the nutrients available in the soil.

Some useful rules of thumb: Bray test: 70 ppm (parts per million) available phosphorus is ideal. NPK analysis with a value of 10 or less for phosphorus. Long-term release from organic fertilizers is better. Wait about 3 weeks after vaccination until the next fertilization.


Erosion Protection and Soil Reclamation:

Mycorrhiza granules can be dissolved in water and used to immunize seeds or areas to be treated. However, this is easier and more efficient with Mycorrhiza powder as it spreads better in the water and the seed is more evenly covered and easier to spread. 
It is important to mix the materials well, if possible also during application.


Forestry:

The best time to immunize with mycorrhiza is between sowing and germination of the plants, i.e. very early in the growth cycle. Lignified plants can also be treated later, especially if the nutrient supply to the system is low. Containerized plants are inoculated during the last irrigation before being exposed outdoors. In irrigation systems, the growth medium is well watered first, then the spores are applied and then flushed into the root area of the plants with another application of water. Fungicides containing PCNB or Benlat damage the mycorrhiza. Fertilizers that quickly release many nutrients should be avoided. Herbicides, nematicides and insecticides are generally well tolerated.

Horticulture: Phosphorus availability and mycorrhiza

High concentrations of the available phosphorus at the time of vaccination do not harm the mycorrhiza, but can slow its spread. One of the most important functions of mycorrhiza is to absorb phosphorus from the soil for the plants. If enough phosphorus is already present, the mycorrhiza works more slowly. Before vaccination, the phosphorus levels should ideally be close to a natural concentration. After about 3 weeks, the concentration can be increased again if necessary without affecting the mycorrhiza. However, it should be noted that plants with mycorrhiza can still make better and more efficient use of the nutrients present in the soil. 

Some useful rules of thumb: Bray test: 70 ppm (parts per million) available phosphorus is ideal. NPK analysis with a value of 10 or less for phosphorus.
Long-term release from organic fertilizers is better. Wait about 3 weeks after vaccination until the next fertilization.

Hydroponics:

The mycorrhiza is mixed directly with the medium or added to the nutrient solution. 
The optimum pH value is between 5.5-7.5 and the concentration of available phosphorus is below 70 ppm. A sufficient oxygen supply must be ensured.
The best results are achieved with products containing several mycorrhiza species.
Inoculation should be carried out several times during the plant's growth cycle. 
From the onset of flowering, a symbiosis between fungus and plant should already exist, then no further applications are necessary.​

Lawn areas: Phosphorus availability and mycorrhiza

High concentrations of available phosphorus at the time of vaccination do not harm the mycorrhiza, but can slow down its spread. One of the most important functions of mycorrhiza is to release phosphorus from the soil for the plants. If there is enough available phosphorus, the mycorrhiza works more slowly. Before vaccination, the phosphorus levels should best be close to a natural concentration. After about 3 weeks, the concentration can be increased again if necessary without affecting the mycorrhiza. However, it should be taken into account that the plants with mycorrhiza can use the nutrients present in the soil better and more efficiently anyway.

Some useful rules of thumb: Bray test: 70 ppm (parts per million) of available phosphorus is ideal. NPK analysis with a value of 10 or less for phosphorus. Long-term release from organic fertilizers is better. After vaccination, wait about 3 weeks until the next fertilization.