Spectroscopy and Spectral Analysis, Volume. 32, Issue 2, 330(2012)
Evaluation of Nutrient Release Profiles from Polymer Coated Fertilizers Using Fourier Transform Mid-Infrared Photoacoustic Spectroscopy
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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SHEN Ya-zhen, DU Chang-wen, ZHOU Jian-min, WANG Huo-yan, CHEN Xiao-qin. Evaluation of Nutrient Release Profiles from Polymer Coated Fertilizers Using Fourier Transform Mid-Infrared Photoacoustic Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2012, 32(2): 330
Received: Apr. 18, 2011
Accepted: --
Published Online: Feb. 20, 2012
The Author Email: Ya-zhen SHEN (yzshen@issas.ac.cn)