I read articles where peat moss is is used in the proportion of 8:1:1 to sand and vermiculite, and I wonder whether the relatively high P concentration in the peat will hinder the AMF to propagate in this kind of substrate.
Thank you!
Dr. Sandro, I endorse your observation. Our experience under arid soils ( Aridisols) is the P concentration should not exceed 5ppm for better AM fungal growth.
The amount of P in soils or substrates depends on the objective of the work, for example for colonization, mycorrhizal dependence, growth, antagonism, etc. It also depends on the type of soil, since there are fixing soils like andisols. I recommend you to see this article: Germination and growth of purple passion fruit seedlings under pre-germination treatments and mycorrhizal inoculation ( Pesq. Agropec. Trop., Goiânia, v. 45, n. 3, p. 257-265, Jul./Sep. 2015 ).
Dear Sandro. The amount of P in soils or artificial substrate depend of different factor as pH, clay, physical and chemical conditions of soils, but in general to propagate mycorrhizae, should use low phosporus concentration, less than 20 ppm.
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