title: Soil test phosphorus and cumulative phosphorus budgets in fertilized grassland.
abstract: We analyzed the linearity of relationships between soil test P (STP) and cumulative phosphorus (P) budget using data from six long-term fertilized grassland sites in four countries: France (Ercé and Gramond), Switzerland (Les Verrières), Canada (Lévis), and Finland (Maaninka and Siikajoki). STP was determined according to existing national guidelines. A linear-plateau model was used to determine the presence of deflection points in the relationships. Deflection points with (x, y) coordinates were observed everywhere but Maaninka. Above the deflection point, a significant linear relationship was obtained (0.33 < r (2) < 0.72) at four sites, while below the deflection point, the relationship was not significant, with a negligible rate of STP decrease. The relationship was not linear over the range of STP encountered at most sites, suggesting a need for caution when using the P budget approach to predict STP changes in grasslands, particularly in situations of very low P fertilization. Our study provides insights and description of a tool to improve global P strategies aimed at maintaining STP at levels adequate for grassland production while reducing the risk of P pollution of water.
authors: Environmental and Resource Studies Program, Trent University, 1600 West Bank Drive, Peterborough, ON, K9J 7B8, Canada, aimejeanmessiga@trentu.ca.
authors: Aimé Jean
authors: AJ
authors: Messiga
authors: Noura
authors: N
authors: Ziadi
authors: Claire
authors: C
authors: Jouany
authors: Perttu
authors: P
authors: Virkajärvi
authors: Raija
authors: R
authors: Suomela
authors: Sokrat
authors: S
authors: Sinaj
authors: Gilles
authors: G
authors: Bélanger
authors: Ciprian
authors: C
authors: Stroia
authors: Christian
authors: C
authors: Morel
mesh_terms: D002170:Canada; D004784:Environmental Monitoring; D005387:Finland; D005602:France; D065948:Grassland; D010758:Phosphorus / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D013557:Switzerland
chemical_list: D012987:Soil; D010758:Phosphorus