Spatial Variability of Soil Phosphorus Indices Under Two Contrasting Grassland Fields in Eastern Canada

Agronomy

AthynaN. Cambouris¹  JeffD.Nze Memiaghe¹  Noura Ziadi¹  Isabelle Perron¹  Antoine Karam² 

[1] Agriculture and Agri-Food Canada, Quebec Research and Development Centre, 2560 Hochelaga Boulevard, Québec City, QC G1V 2J3, Canada;Soils and Agri-Food Engineering Department, Université Laval, 2425 Rue de l’Agriculture, Québec City, QC G1V 0A6, Canada;

关键词: P extracted Mehlich-3;    (P/Al)_M3 index;    organic manure;    geostatistics;    spatial distribution maps;    permanent grasslands;   

DOI  :  10.3390/agronomy11010024

来源: DOAJ

【 摘 要 】

Phosphorus (P) is an essential nutrient for grassland production systems. However, continuous applications of P fertilizers result in soil P accumulations, increasing the risk of P losses in runoff and erosion. This study aims to investigate the field-scale variability of soil-test P (STP) in two contrasting grassland fields using descriptive statistics and geostatistics for accurate recommendations on soil sampling strategy and sustainable approaches to P management. A young grassland (YG; 2 years) and an old grassland (OG; 10 years under permanent pasture) were classified as humo-ferric podzol and received organic fertilizers. Soil samples were collected in 16-m by 16‑m triangular grids at two depths (0–5 and 5–20 cm). They were analyzed for available P and other soil elements extracted using the Mehlich-3 method (M3). The agri-environmental P saturation index (P/Al)_M3 was calculated. Phosphorus accumulation was observed in OG (0–5 cm) as a result of long-term manure applications. Repeated applications of organic fertilizers can impact the long-term buildup of soil P, thus decreasing soil P va-riability and spatial dependence in permanent grasslands. A soil sampling strategy focusing on the 0–5 cm layer should be retained in permanent grasslands for sustainable P recommendations in Eastern Canada.

【 授权许可】

Unknown