Firstly, you do not have to rely on nature alone for your mycorrhiza, for you can purchase them from various stores. Applying the fungi is easy. When you dig your planting hole, sprinkle the fungus in it. Some growers suggest that the night before you plant you moisten the rootball by immersing it in water in which the fungal spores have been put. This gives them time to coat the rootball, and the results will be good for your plants, but it is sufficient to spread the powder. Some growers use a spray. It is important that the fungus is in contact with the roots, as it is still in spore form when applied, but contact with root exudates causes the fungal spores to germinate, which is what you want.
But there are implications for horticultural and agricultural practice. Scientists have noted that when soils are dug the levels of fungal presence deteriorate as the networks are broken up. Deep ploughing is detrimental to fungal well being. This has been seized by the no dig school of horticulture, but there are times when you need to dig,plough or harrow. My personal preference is the limited digging model, in which you only dig and plough when necessary. Some form of digging is necessary if you want to create tilth, the fine soil in which vegetables thrive, and you need to dig when you plant potatoes and other root crops. Digging also replicates the work of rooting animals, such as pigs, which are a natural part of the ecosystem, so some digging cannot be harmful, just do not do too much of it.
There is also the need for farmers and gardeners to apply compost properly. Patience is the key. Don't hurry your compost, allow it to ripen over a few months, for the heating of the heap destroys soil fungi, but the slow ripening process allows them to return from the soil beneath the compost heap and recolonize it. Farmers, who have been no great users of compost, are now looking seriously at it as they are recognizing its value. There is also biochar,that wonderful soil enhancer, for it is thought to be excellent for the development of glomalin in the soil. If you apply both compost and biochar then you are likely to develop a good fungal network in your soil.
But there is another strategy that we should follow:minimize the use of artificial fertilizers, for fungi cannot stand them, which is why when these artificial substances are used, fungal levels drop.Mary Reynolds, writing in The Garden Awakening, speaks of how the white explosions of mushrooms that coated Ireland's fields in Autumn [Fall] are now gone, as the farmers began to apply artificial fertilizer instead of manure. These mushrooms provided a source of food for some people, and their loss is not a blessing.