Loss of P Fertilizer Effectiveness in Raising Soil P Availability in a Grazed Grassland Enriched With CO₂ for 24 Years.

ABSTRACT: Phosphorus (P) is a finite resource and an essential macronutrient for plant growth. The importance of low soil P availability in constraining plant biomass responses to elevated CO₂ (eCO₂) is increasingly recognized. P fertilization could alleviate these constraints, but biogeochemical feedbacks under eCO₂ may diminish the effectiveness of P fertilizer in raising soil P availability. Here, we present data from a botanically diverse grazed pasture enriched with CO₂ (+84-111 ppm) and supplied with P fertilizer (1.5 g P m^-2 year^-1) for approximately 24 years, showing (1) a sustained 27% reduction in topsoil Olsen P under eCO₂ prior to annual fertilizer application, and (2) an approximate halving of the short-term (a

SUBMITTER: Beechey-Gradwell Z 

PROVIDER: S-EPMC11971680 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature