Work

Agronomic Evaluation of Recovered Phosphorus and Related Solids from Layer Manure

Year: 2026

Type: article

Abstract: The recovery of phosphorus (P) from layer manure can contribute to closing nutrient cycles while reducing dependence on mineral P fertilizers. This study evaluated the agronomic performance of recovered phosphorus products (RP) and recovered solids (RS) obtained from layer manure using three different P extractants. Therefore, three RP products from extraction using (1) sulfuric acid, (2) oxalic acid, or (3) grape pomace combined with sulfuric acid, and their corresponding RS fractions, were evaluated in two greenhouse pot experiments with ryegrass (Lolium multiflorum). P and nitrogen (N) uptake, P recovery efficiency (PRE), N recovery efficiency (NRE), and changes in soil nutrient availability were assessed including N and P commercial fertilizers. In Experiment 1, all P-fertilized treatments increased ryegrass biomass, while RP showed P uptake comparable to commercial P fertilizer. P uptake was more strongly associated with application rate than RP source. In Experiment 2, urea produced the highest biomass, N uptake, and NRE, whereas layer manure and RS showed limited short-term N availability. Overall, RP showed promise as a short-term P fertilizer, whereas RS may be better suited for longer-term nutrient release. These results support the potential of layer manure-derived products as recovered fertilizers within circular nutrient management strategies.

Source: Waste

DOI: 10.3390/waste4040034

Authors: Virginia Takata, Amabelia del Pino, Ariel Szogi

Institution: Universidad de Montevideo

Language: English

Topic: Phosphorus and nutrient management

Subfield: Waste Management and Disposal

Field: Environmental Science

Domain: Physical Sciences

SDGs: Responsible consumption and production, Zero hunger

Open Access status: gold

Estimated APC paid: $1,207