Soil test phosphorus and cumulative phosphorus budgets in fertilized grassland.
Ambio
; 44 Suppl 2: S252-62, 2015 Mar.
Article
em En
| MEDLINE
| ID: mdl-25681982
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.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fósforo
/
Solo
/
Monitoramento Ambiental
/
Pradaria
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article