Preparation process of a biofertilizer based on arbuscular mycorrhizal fungi forming symbiosis. The invention is a method of preparing a biofertilizer obtained with the homogeneous mixture of a carrier substrate propagative material together arbuscular mycorrhizal fungal paper previously detoxified, and subsequent compaction. Thus a granulate consisting of constituents biofertilizer low cost is obtained applicable not only greenhouse crops or nursery, but large scale.
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