Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Development of real-time chemical properties analysis technique in paddy soil for precision farming

정밀농업을 위한 토양의 실시간 이화학 성분 분석 기술 개발

  • Yun, Hyun-Woong (School of life Science and Biotechnology, Sungkyunkwan University) ;
  • Choi, Chang-Hyun (School of life Science and Biotechnology, Sungkyunkwan University) ;
  • Kim, Yong-Joo (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Hong, Soon-Jung (Rural Development Administration Rural Human Resource Development Center)
  • Received : 2014.03.03
  • Accepted : 2014.03.21
  • Published : 2014.03.31
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Abstract

Precision farming aims at reduced environmental impacts with increased productivity. Soils are multi-functional media in which air, water and biota occur together and form an essential part of the landscape with a fundamental role in the environment. The requirement for herbicides and fertilizers can vary within a field in response to spatial differences in soil properties. Near infrared (NIR) spectroscopy is widely used today as a nondestructive analytical technique which is capable of determining a number of physio-chemical parameters. The objectives of this study were to develop optimal models to predict chemical properties of paddy soils by visible and NIR reflectance spectra. Total of 60 soil samples were collected in spring from 20 paddy fields within central regions in Korea. Reflectance spectra, moisture contents, pH, total nitrogen (N), organic matter, available phosphate ($P_2O_5$) of soil samples were measured. The reflectance spectra were measured in wavelength ranges of 400-2,500 nm with 2 nm interval. The method of partial least square (PLS) analysis was used to determine the soil properties. The PLS analyses showed good correlation between predicted and measured chemical properties of paddy soils in the wavelength range of 1,800-2,400 nm. Especially, it showed better performance than the previous results which used the entire wavelength range of the spectrophotometer, without considering the optimal wavelength of each soil properties.

Keywords

References

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