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Involved partners : Eau Seine Normandie France (Water Agency) AGRALIS SERVICES, SOBAC.

Climate change must be at the forefront of the water management debate to establish a public policy that meets high societal and environmental expectations. Surface run-off is a major factor in the erosion of agricultural soils. Likewise, the transfer of minerals to soil depths is a key process in the pollution of groundwater and the eutrophication of watercourses. Soils lose their ability to retain rainwater, thereby increasing the risk and size of flooding. By their surface area and their use, agricultural soils concentrate environmental, agronomic and health concerns. The modification of the soil structure and the gradual disappearance of the micro-organisms living there are hypotheses that partially explain the decrease in agricultural SOBAC solutions have been developed to meet the needs of jointly managing these concerns. These solutions, available under the BACTÉRIOSOL / BACTÉRIOLIT brands, consist of an ecosystem of micro- organisms developed on plant naturally composted from Marcel Mézy Technologies (MMT). They allow rapid creation of humus, which is the natural reservoir of water and nutrients for plants. This document synthesizes a comparative observational study over 3 years carried out on an agricultural plot divided in two with a control part and a part seeded with BACTÉRIOSOL.

Quantifications of the water content and the quantity of ions (nutrients in solution) in the soils are carried out and are compared with agronomic results. From 2016 to 2018, on the Auger St Vincent (60) catchment basin, two SENTEK capacitive probes, 20 meters apart, measured the conductivity and the water potential of the soil at 3 depths : 15 cm, 35 cm and 55 cm. Monitoring was carried out by Dr. Jean-François BERTHOUMIEU, from the company Agralis, which is developing the use of these Australian probes in France. The analysis of the measurements is done blindly to ensure total objectivity of the interpretation.