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The grounds of limestone formation are favorable to the development of the Truffle.
This explains why it is found in different French regions with varied limestone sedimentary formations.
Limestone is essential for the formation of truffles. The optimum pH is between 7.3 and 8.5 with at least 8% active limestone for its cultivation.
A simple analysis consists of pouring a solution of water and 15% acid hydrochloric acid on the soil, if the limestone level is correct, there will be a chemical reaction (effervescence).
Favorable soils are generally shallow, 15 to 40 cm, on fissured rock. The permeability of the soil is just as important, it must be flexible (draining) without too much excess clay (maximum 40%). With a lumpy, sandy or stony structure, these soils facilitate the drainage and filtering of water in the subsoil, and thus allow good oxygenation of the mycelium.
Map of truffle production areas
It is necessary to understand the quality of the land in which we are going to plant truffles.
Organic matter also plays an essential role in truffle growing (the truffle draws the nutrients and energy necessary for its growth from it), the carbon/nitrogen (C/N) ratio must be close to 10 for production with possible correction in the area. pre-production.
The evolution of these organic matter and the C/N ratio is entirely due to the type of tillage that one will choose to bring his truffle field into production.