A Fertilisation Strategy Combining Mineral Fertiliser and Biosolid Improves Long-Term Yield and Carbon Storage in a Calcareous Soil

At a strategic moment for agricultural soils, which are expected to contribute climate change mitigation through carbon storage while safely feeding growing world population, the fertiliser strategies used will be key. In calcareous soil with extensive rainfed use and straw removal, different were evaluated aim of determining their effects on crop yield, nitrogen agronomic efficiency, organic total in soil. Different doses mineral fertiliser, expressed as kg ha−1 year−1 (0, 60, 120, 180, 240 fertilising units (NFUs)), applied plots without biosolid amendment. The biosolid, at rate 40 Mg every 3 years 18 years, complied national European regulations combined fertilisation reduced amount between 33 67% 7 40%, maintaining similar yields reference (180 NFUs). These results could related higher efficiency treatments that do not exceed NFUs required by crop. Combined was also an effective technique store However, compared NFUs), no significant changes observed, probably due management method is removed gas emissions. Our support need assess efficacy each local scales order overestimate or underestimate potential carbon.