title: Diffusive Gradients in Thin Films as a Reference Method for Assessing Soil Phosphorus by Visual and Near-Infrared Spectroscopy.
abstract: Phosphorus (P) deficiency is a severe challenge in many agricultural areas around the globe, while at the same time, aquatic environments are threatened by leaching and runoff of excess P in other areas. Accurate, cheap, and rapid assessment of crop P needs and risk of P loss is therefore necessary to optimize the use of P fertilizer worldwide. The purpose of this study was to develop a method to predict soil P concentrations by visual and near-infrared spectroscopy using reference P concentrations determined by diffusive gradients in thin films (DGT); Olsen P results were included for comparison. The study was conducted on paddy soils from six main rice-producing ( L.) provinces in southern China. Using DGT P as a reference resulted in a better visual and near-infrared calibration to predict soil P concentrations, as compared with using Olsen P.
authors.forename: Marie
authors.initials: M
authors.lastname: van Maarschalkerweerd
authors.forename: Songjuan
authors.initials: S
authors.lastname: Gao
authors.forename: Jinshun
authors.initials: J
authors.lastname: Bai
authors.forename: Søren
authors.initials: S
authors.lastname: Husted
authors.forename: Weidong
authors.initials: W
authors.lastname: Cao
authors.forename: Peter E
authors.initials: PE
authors.lastname: Holm
mesh_terms: D002681:China; D005308:Fertilizers; D010758:Phosphorus / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants; D019265:Spectroscopy, Near-Infrared
chemical_list: D005308:Fertilizers; D012987:Soil; D012989:Soil Pollutants; D010758:Phosphorus