Compliance Methods to determine the Agronomic Performance of Bio-Based Fertilisers

Summary in the original language of the document

Bio-based fertilisers (BBFs) are a potentially more sustainable source of nutrients in agriculture than conventional synthetic or mined fertilisers. Given the diverse nature of BBFs, predicting their nitrogen (N) and phosphorus (P) bioavailability is crucial for their proper and efficient use in agriculture. To address this, we conducted a comprehensive assessment of potentially mineralizable N and carbon (C) content, as well as NH3 volatilisation, for a representative selection of 42 N-BBFs, and explored various chemical extraction methods to predict their N bioavailability. With respect to P-BBFs, we tested the P extractability of 30 P-BBFs through six different extraction methods and related P extractability to P uptake as determined by a suite of three pot experiments conducted up to maturity in different soils and conditions.