Improving plant availability of recycled phosphorus with organic acids

• DOI: 10.1016/j.eti.2023.103401
• Publication Date: 2023-10-12T16:17:52Z
• Authors: Riikka Keskinen; Jari Hyväluoma; Johanna Nikama; Tuomo Sainio; Kari Ylivainio

Increasing the efficiency of phosphorus (P) use through nutrient circularity is essential for securing P sufficiency and reducing pollution. The release in recycled materials can be enhanced with organic acids produced from cellulose. In this study, fertilisers based on sewage sludge (SS) poultry manure (BR) were treated increasing levels (0%, 8%, 20%) hydroxy carboxylic acid mixture to determine effect acidification availability other selected elements. According sequential extractions, increased share labile both products. SS, which was dominated by refractory metal phosphates, a higher dose required effect, smaller total transformed than BR, already rich easily accessible P. Besides P, mobility several elements but induced no harmful element accumulation ryegrass leaves. lability recorded fractionation SS reflected uptake, cumulative yield, apparent recovery, mineral-P equivalence. BR exhibiting superiority mineral plant growth uptake negative. Acidification treatment offers an option enhance circular needs tailored according product characteristics. Optimising application rate composition might allow effectiveness while avoiding negative effects.