ECOSYS / Dispositifs expérimentaux d'observation longue durée des propriétés des sols : Deherain et 36 parcelles

Dehérain system: set up in 1875 to study the long-term evolution of the "chemical quality of the soil" (fertility, evolution of organic matter) as a function of agricultural practices (type of fertilisation). 36 plots" system: set up in 1959 to study the evolution in the soil of buried straw, with or without mineral nitrogen and/or straw composting (six treatments, including one without straw or nitrogen). The system is maintained without vegetation and consists of six blocks of six square plots of 10 m2 each.

• Mrs Sabine HOUOT