Abstract
The non-destructive and rapid estimation of the crop's leaf nitrogen concentration (LNC) is significant for the quality evaluation and precise management of nitrogen (N) fertilizer. First derivative can be applied to reduce the noise in the spectral analysis, which is suited to estimate leaf N and chlorophyll concentration with different fertilization levels. In this study, the first-derivative fluorescence spectrum (FDFS) was calculated in terms of the laser-induced fluorescence (LIF) spectra and was combined with different regression algorithms, including principal component analysis (PCA), partial least-square regression (PLSR), random forest (RF), radial basic function neural network (RBF-NN), and back-propagation neural network (BPNN) for paddy rice LNC estimation. Then, the effect of diverse inner parameters on regression algorithm for LNC estimation based on the calculated FDFS served as input variables were discussed, and the optimal parameters of each model were acquired. Subsequently, the performance of different models (PLSR, RF, BPNN, RBF-NN, PCA-RF, PCA-BPNN, and PCA-RBFNN) with the optimal parameter for LNC estimation based on FDFS was discussed. Results demonstrated that PCA can efficiently extract major spectral...Continue Reading
References
Mar 28, 1998·Substance Use & Misuse·M Buscema
Jul 29, 2005·Photosynthesis Research·Zbigniew KolberBarry Osmond
Oct 1, 1983·Applied Optics·F E HogeJ K Yungel
Jan 1, 1984·Applied Optics·E W ChappelleW W Newcomb
Jun 16, 2012·Plant Physiology and Biochemistry : PPB·Marian BresticSuleyman I Allakhverdiev
Jan 22, 2014·Photosynthesis Research·Marek Zivcak Govindjee
May 9, 2014·Plant Physiology and Biochemistry : PPB·Hazem M KalajiVasilij Goltsev
Sep 22, 2015·Journal of Photochemistry and Photobiology. B, Biology·Marek ZivcakSuleyman I Allakhverdiev
Jun 29, 2016·Scientific Reports·Jian YangZhenbing Zhang
Nov 7, 2016·Photosynthesis Research·Hazem M KalajiWojciech Bąba
Mar 1, 2017·Optics Express·Jian YangWei Gong
Dec 1, 2017·Photosynthesis Research·Hazem M KalajiAgnieszka Kompała-Bąba
Mar 15, 2018·Frontiers in Plant Science·Wei HuangTao Liu
Mar 17, 2019·Optics Express·Jian YangBiwu Chen
Sep 11, 2019·Applied Optics·Jian YangBiwu Chen
Citations
Sep 26, 2020·Applied Optics·Tianyi HaoHaofang Niu
Dec 29, 2020·Optics Express·Jian YangLin Du
Apr 4, 2021·Sensors·Yangyang ZhangLin Du