Evaluation of Nutrient Release Profiles from Polymer Coated Fertilizers Using Fourier Transform Mid-Infrared Photoacoustic Spectroscopy
SHEN Ya-zhen1,2, DU Chang-wen1*, ZHOU Jian-min1, WANG Huo-yan1, CHEN Xiao-qin1
1. The State Key Lab of Soil and Agricultural Sustainability, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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.
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