The results of 21-year trial on the agronomic use of digestate are here!
Years of experiments on the agronomic use of digestate led to very satisfactory results.
In Emilia-Romagna, a fertilisation trial has been carried out, applying digested sludge on the ground within the framework of an agronomic trial. Over those 11 years the level of organic substance content of the soil has increased in a significant manner. The used sludge was in the liquid, dehydrated and composted forms and even mixed with straw and stabilised. With a production of approximately 50 tonnes of organic carbon over years, the 20% of it was kept in soil. The increase of carbon is beneficial not just because the sequestration of CO2 from the atmosphere, but also because organic carbon increases soil fertility, ensuring a greater porosity of the ground, a more balanced availability of nutrients and reducing erosion.