PMID- 23387170
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20140502
LR  - 20130207
IS  - 1000-0593 (Print)
IS  - 1000-0593 (Linking)
VI  - 32
IP  - 11
DP  - 2012 Nov
TI  - [Based on the LS-SVM modeling method determination of soil available N and 
      available K by using near-infrared spectroscopy].
PG  - 3019-23
AB  - Visible infrared spectroscopy (Vis/SW-NIRS) was investigated in the present study 
      for measurement accuracy of soil properties,namely, available nitrogen(N) and 
      available potassium(K). Three types of pretreatments including standard normal 
      variate (SNV), multiplicative scattering correction (MSC) and Savitzky-Golay 
      smoothing+first derivative were adopted to eliminate the system noises and 
      external disturbances. Then partial least squares (PLS) and least squares-support 
      vector machine (LS-SVM) models analysis were implemented for calibration models. 
      Simultaneously, the performance of least squares-support vector machine (LS-SVM) 
      models was compared with three kinds of inputs, including PCA(PCs), latent 
      variables (LVs), and effective wavelengths (EWs). The results indicated that all 
      LS-SVM models outperformed PLS models. The performance of the model was evaluated 
      by the correlation coefficient (r2) and RMSEP. The optimal EWs-LS-SVM models were 
      achieved, and the correlation coefficient (r2) and RMSEP were 0.82 and 17.2 for N 
      and 0.72 and 15.0 for K, respectively. The results indicated that visible and 
      short wave-near infrared spectroscopy (Vis/SW-NIRS)(325-1 075 nm) combined with 
      LS-SVM could be utilized as a precision method for the determination of soil 
      properties.
FAU - Liu, Xue-Mei
AU  - Liu XM
AD  - College of Environmental Science and Engineering, Donghua University, Shanghai 
      201620, China. lyumu@163.com
FAU - Liu, Jian-She
AU  - Liu JS
LA  - chi
PT  - English Abstract
PT  - Journal Article
PL  - China
TA  - Guang Pu Xue Yu Guang Pu Fen Xi
JT  - Guang pu xue yu guang pu fen xi = Guang pu
JID - 9424805
EDAT- 2013/02/08 06:00
MHDA- 2013/02/08 06:01
CRDT- 2013/02/08 06:00
PHST- 2013/02/08 06:00 [entrez]
PHST- 2013/02/08 06:00 [pubmed]
PHST- 2013/02/08 06:01 [medline]
PST - ppublish
SO  - Guang Pu Xue Yu Guang Pu Fen Xi. 2012 Nov;32(11):3019-23.