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2020 Vol.65, Issue 4 Preview Page
Changes in the Hyperspectral Characteristics of Wheat Plants According to N Top-dressing Rates at Various Growth Stages

밀에서 질소 시비 조건에 따른 생육 단계별 초분광 특성 변화

Jae Gyeong Jung1§
,
Yeong Hun Lee1§
,
Jae Eun Choi1
,
Gi Eun Song2
,
Jong Han Ko3
,
경도 이4
,
상인 심5*
정 재경1§
,
이 영훈1§
,
최 재은1
,
송 기은2
,
고 종한3
,
이 경도4
,
심 상인5*
1MSc Student, Department of Agronomy, Gyeongsang National University
2PhD Student, Department of Agronomy Applied Biological Science, Applied Biology (BK Plus), Gyeongsang National University
3Professor, Applied Plant Science, Chonnam National University
4Agriculture Researcher, Department of Agricultural Enviroment, National Institute of Agricultural Sciences
5Professor, Department of Agronomy, Gyeongsang National University
1국립 경상대학교 농학과 석사연구원
2국립 경상대학교 응용생명과학부 BK21+ 프로그램 박사연구원
3국립 전남대학교 응용식물학과 교수
4농촌진흥청 국립농업과학원 농업환경부 연구사
5국립 경상대학교 농학과 교수
*Corresponding Author
§These authors contributed equally to this work.
1 December 2020. pp. 377-385
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Abstract

Recently, wheat consumption has been increasing in Korea, requiring increased production. Nitrogen fertilization is a critical determinant in crop yield; therefore, it is necessary to optimize the nitrogen fertilization regime with current trends that emphasize the minimum impact of nitrogen fertilizer on the environment. In this study, both nondestructive spectral analysis using a hyperspectral camera and growth analysis were performed to determine the optimal N top-dressing rates after heading. The nitrogen application regimes consisted of three conditions according to the secondary top-dressing rate: N4:3:0 (0 kg 10 a-1), N4:3:3 (2.73 kg 10 a-1), and N4:3:6 (5.46 kg 10 a-1). Subsequently, growth and physiological investigations were performed at the jointing, heading, and ripening stages of wheat, and spectral investigations were conducted. On April 29, as the nitrogen fertilization rate was increased to N4:3:3 and N4:3:6, plant height and grain yield increased by 4% and 8%, and 8% and 52%, respectively, compared to those under N4:3:0. Leaf area index and SPAD value also increased by 13% and 24%, and 32% and 43%, respectively. The R (red), G (green), and B (blue) of leaf color were lowered by 15, 11, and 4 in N4:3:3 and 44, 34, and 18 in N4:3:6, respectively, as compared to the control. Grain yield was the highest at high top-dressing (N4:3:6), however, there was no difference between no top-dressing (N4:3:0) and intermediat top-dressing (N4:3:3). The reflectance analyzed using a hyperspectral camera showed a difference in the near-infrared (NIR) region on March 19, and on April 29, there was a difference both in the visible light region greater than 550 nm and the NIR region. Vegetation indices differed according to fertilization regime, except for the greenness index (GI). The results of this study showed that not only growth and physiological analysis but also spectral indices can be used to optimize the nitrogen top-dressing rate.

Keywords
hyperspectral reflectance
N top-dressing
vegetation index
wheat
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Information
  • Publisher :The Korean Society of Crop Science
  • Publisher(Ko) :한국작물학회
  • Journal Title :The Korean Journal of Crop Science
  • Journal Title(Ko) :한국작물학회지
  • Volume : 65
  • No :4
  • Pages :377-385
  • Received Date : 2020-08-07
  • Revised Date : 2020-09-02
  • Accepted Date : 2020-09-12
  • DOI :https://doi.org/10.7740/kjcs.2020.65.4.377
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