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In Situ Measurement of Some Soil Properties in Paddy Soil Using Visible and Near-Infrared Spectroscopy

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  • Ji Wenjun
  • Shi Zhou
  • Huang Jingyi
  • Li Shuo

Abstract

In situ measurements with visible and near-infrared spectroscopy (vis-NIR) provide an efficient way for acquiring soil information of paddy soils in the short time gap between the harvest and following rotation. The aim of this study was to evaluate its feasibility to predict a series of soil properties including organic matter (OM), organic carbon (OC), total nitrogen (TN), available nitrogen (AN), available phosphorus (AP), available potassium (AK) and pH of paddy soils in Zhejiang province, China. Firstly, the linear partial least squares regression (PLSR) was performed on the in situ spectra and the predictions were compared to those with laboratory-based recorded spectra. Then, the non-linear least-square support vector machine (LS-SVM) algorithm was carried out aiming to extract more useful information from the in situ spectra and improve predictions. Results show that in terms of OC, OM, TN, AN and pH, (i) the predictions were worse using in situ spectra compared to laboratory-based spectra with PLSR algorithm (ii) the prediction accuracy using LS-SVM (R2>0.75, RPD>1.90) was obviously improved with in situ vis-NIR spectra compared to PLSR algorithm, and comparable or even better than results generated using laboratory-based spectra with PLSR; (iii) in terms of AP and AK, poor predictions were obtained with in situ spectra (R2

Suggested Citation

  • Ji Wenjun & Shi Zhou & Huang Jingyi & Li Shuo, 2014. "In Situ Measurement of Some Soil Properties in Paddy Soil Using Visible and Near-Infrared Spectroscopy," PLOS ONE, Public Library of Science, vol. 9(8), pages 1-11, August.
    • Handle: RePEc:plo:pone00:0105708
    DOI: 10.1371/journal.pone.0105708
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    References listed on IDEAS

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    1. Xuejun Liu & Ying Zhang & Wenxuan Han & Aohan Tang & Jianlin Shen & Zhenling Cui & Peter Vitousek & Jan Willem Erisman & Keith Goulding & Peter Christie & Andreas Fangmeier & Fusuo Zhang, 2013. "Enhanced nitrogen deposition over China," Nature, Nature, vol. 494(7438), pages 459-462, February.
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    1. Chutipong ROMSONTHI & Saowanuch TAWORNPRUEK & Sumitra WATANA, 2018. "In situ near-infrared spectroscopy for soil organic matter prediction in paddy soil, Pasak watershed, Thailand," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 64(2), pages 70-75.
    2. Glinko Agnieszka & Kaźmierowski Cezary & Piekarczyk Jan & Królewicz Sławomir, 2022. "Assessment of Soil Characteristics Using a Three-Band Agricultural Digital Camera," Quaestiones Geographicae, Sciendo, vol. 41(3), pages 127-140, September.

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