Interesting note in Wiki
Quote:
The growth of AM hyphae through the soil is controlled by host root exudates and the soil phosphorus concentration.
Low phosphorus concentrations in the soil increase hyphal growth and branching as well as induce plant exudation of compounds which control hyphal branching intensity.[7][9]
The branching of AM fungal hyphae grown in 1 mM phosphorus media is significantly reduced but the length of the germ tube and total hyphal growth was not affected. A concentration of 10 mM phosphorus inhibited both hyphal growth and branching. This phosphorus concentration occurs in natural soil conditions and could thus contribute to reduced mycorrhizal colonisation.[9]
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Arbuscular mycorrhiza - Wikipedia, the free encyclopedia
Commercial Fertilisers for acid loving plants are low in Phosphorus. Why is that?