title: [Evaluation of nutrient release profiles from polymer coated fertilizers using Fourier transform mid-infrared photoacoustic spectroscopy].
abstract: The acrylate-like materials were used to develop the polymer coated controlled release fertilizer, the nutrients release profiles were determined, meanwhile the Fourier transform mid-infrared photoacoustic spectra of the coatings were recorded and characterized; GRNN model was used to predict the nutrients release profiles using the principal components of the mid-infrared photoacoustic spectra as input. Results showed that the GRNN model could fast and effectively predict the nutrient release profiles, and the predicted calibration coefficients were more than 0.93; on the whole, the prediction errors (RMSE) were influenced by the profiling depth of the spectra, the average prediction error was 10.28%, and the spectra from the surface depth resulted in a lowest prediction error with 7.14%. Therefore, coupled with GRNN modeling, Fourier transform mid-infrared photoacoustic spectroscopy can be used as an alternative new technique in the fast and accurate prediction of nutrient release from polymer coated fertilizer.
authors.affiliation: The State Key Lab of Soil and Agricultural Sustainability, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. yzshen@issas.ac.cn
authors.forename: Ya-zhen
authors.initials: YZ
authors.lastname: Shen
authors.forename: Chang-wen
authors.initials: CW
authors.lastname: Du
authors.forename: Jian-min
authors.initials: JM
authors.lastname: Zhou
authors.forename: Huo-yan
authors.initials: HY
authors.lastname: Wang
authors.forename: Xiao-qin
authors.initials: XQ
authors.lastname: Chen
mesh_terms: D000179:Acrylates; D005308:Fertilizers; D005583:Fourier Analysis; D009584:Nitrogen; D010758:Phosphorus; D011108:Polymers; D013055:Spectrophotometry, Infrared; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis
chemical_list: D000179:Acrylates; D005308:Fertilizers; D011108:Polymers; D010758:Phosphorus; C036658:acrylic acid; D009584:Nitrogen