Salomon, Eva; Wahlund, Lotten; Odelros, Åsa; Aronsson, Helena and Lovang, Malin (2021) Phosphorus Retention Materials In Outdoor Paddocks And Distribution Of Laying Hens During The Grazing Period. Paper at: Organic World Congress 2021, Science Forum: 6th ISOFAR Conference co-organised with INRA, FiBL, Agroecology Europe, TP Organics and ITAB, Rennes, France, 8 - 10 September, 2021. [Completed]