A simple visible and near-infrared (V-NIR) camera system for monitoring the leaf area index and growth stage of Italian ryegrass

Xinyan Fan, Kensuke Kawamura (Corresponding Author), Wei Guo, Tran Dang Xuan, Jihyun Lim, Norio Yuba, Yuzo Kurokawa, Taketo Obitsu, Renlong Lv, Yoshimasa Tsumiyama, Taisuke Yasuda, Zuomin Wang

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

Crop growth stage is critical for making decisions in nutrient management and for evaluating crop productivity. In this study, a simple visible and near-infrared (V-NIR) camera system was developed for monitoring the leaf area index (LAI) and quantifying the quick growth stage (QGS) of Italian ryegrass. RAW format images in the red, green and NIR channels over two growing seasons of 2014–15 and 2015–16 were captured hourly each day by the V-NIR camera system installed in three Italian ryegrass fields at the farm of Hiroshima University. Multiple linear regression (MLR) models that predict the forage LAI from the imagery data were calibrated and validated, with high coefficient of determination (R 2=0.79) and low root-mean-square error (RMSE=1.09) between the measured and predicted LAIs. The predicted LAI to which three vegetation indices were compared was fitted against a logistic model to extract forage QGS from smoothed time-series data under various micro-meteorological and nutrient conditions. The result shows the time-series data of LAI can be applied for monitoring seasonal changes regardless of the environmental conditions. The RMSE of the predicted phenology dates against the field-measured LAI was 0.58 and 5.2 days for the start- and end-QGS, respectively, under the high-yield condition in season 1. However, in season 2, only the start-QGS was identifiable, with an RMSE of 2.65 days under the nutritional stress condition. The forage LAI and QGS were predicted and identified with acceptable accuracy and reliability, which suggests that the V-NIR camera system can be employed as a cost-effective approach for monitoring seasonal changes in crop growth, aiding in better personalized crop and nutrient management.

Original languageEnglish
Pages (from-to)314-323
Number of pages10
JournalComputers and electronics in agriculture
Volume144
Early online date27 Nov 2017
DOIs
Publication statusPublished - Jan 2018
Externally publishedYes

Keywords

  • Digital camera
  • Time-series data
  • Image processing
  • Agronomic parameters
  • Growth modeling
  • Quick growth stage
  • ITC-ISI-JOURNAL-ARTICLE
  • UT-Hybrid-D

Cite this

Fan, Xinyan ; Kawamura, Kensuke ; Guo, Wei ; Xuan, Tran Dang ; Lim, Jihyun ; Yuba, Norio ; Kurokawa, Yuzo ; Obitsu, Taketo ; Lv, Renlong ; Tsumiyama, Yoshimasa ; Yasuda, Taisuke ; Wang, Zuomin. / A simple visible and near-infrared (V-NIR) camera system for monitoring the leaf area index and growth stage of Italian ryegrass. In: Computers and electronics in agriculture. 2018 ; Vol. 144. pp. 314-323.
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title = "A simple visible and near-infrared (V-NIR) camera system for monitoring the leaf area index and growth stage of Italian ryegrass",
abstract = "Crop growth stage is critical for making decisions in nutrient management and for evaluating crop productivity. In this study, a simple visible and near-infrared (V-NIR) camera system was developed for monitoring the leaf area index (LAI) and quantifying the quick growth stage (QGS) of Italian ryegrass. RAW format images in the red, green and NIR channels over two growing seasons of 2014–15 and 2015–16 were captured hourly each day by the V-NIR camera system installed in three Italian ryegrass fields at the farm of Hiroshima University. Multiple linear regression (MLR) models that predict the forage LAI from the imagery data were calibrated and validated, with high coefficient of determination (R 2=0.79) and low root-mean-square error (RMSE=1.09) between the measured and predicted LAIs. The predicted LAI to which three vegetation indices were compared was fitted against a logistic model to extract forage QGS from smoothed time-series data under various micro-meteorological and nutrient conditions. The result shows the time-series data of LAI can be applied for monitoring seasonal changes regardless of the environmental conditions. The RMSE of the predicted phenology dates against the field-measured LAI was 0.58 and 5.2 days for the start- and end-QGS, respectively, under the high-yield condition in season 1. However, in season 2, only the start-QGS was identifiable, with an RMSE of 2.65 days under the nutritional stress condition. The forage LAI and QGS were predicted and identified with acceptable accuracy and reliability, which suggests that the V-NIR camera system can be employed as a cost-effective approach for monitoring seasonal changes in crop growth, aiding in better personalized crop and nutrient management.",
keywords = "Digital camera, Time-series data, Image processing, Agronomic parameters, Growth modeling, Quick growth stage, ITC-ISI-JOURNAL-ARTICLE, UT-Hybrid-D",
author = "Xinyan Fan and Kensuke Kawamura and Wei Guo and Xuan, {Tran Dang} and Jihyun Lim and Norio Yuba and Yuzo Kurokawa and Taketo Obitsu and Renlong Lv and Yoshimasa Tsumiyama and Taisuke Yasuda and Zuomin Wang",
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Fan, X, Kawamura, K, Guo, W, Xuan, TD, Lim, J, Yuba, N, Kurokawa, Y, Obitsu, T, Lv, R, Tsumiyama, Y, Yasuda, T & Wang, Z 2018, 'A simple visible and near-infrared (V-NIR) camera system for monitoring the leaf area index and growth stage of Italian ryegrass' Computers and electronics in agriculture, vol. 144, pp. 314-323. https://doi.org/10.1016/j.compag.2017.11.025

A simple visible and near-infrared (V-NIR) camera system for monitoring the leaf area index and growth stage of Italian ryegrass. / Fan, Xinyan; Kawamura, Kensuke (Corresponding Author); Guo, Wei; Xuan, Tran Dang; Lim, Jihyun; Yuba, Norio; Kurokawa, Yuzo; Obitsu, Taketo; Lv, Renlong; Tsumiyama, Yoshimasa; Yasuda, Taisuke; Wang, Zuomin.

In: Computers and electronics in agriculture, Vol. 144, 01.2018, p. 314-323.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - A simple visible and near-infrared (V-NIR) camera system for monitoring the leaf area index and growth stage of Italian ryegrass

AU - Fan, Xinyan

AU - Kawamura, Kensuke

AU - Guo, Wei

AU - Xuan, Tran Dang

AU - Lim, Jihyun

AU - Yuba, Norio

AU - Kurokawa, Yuzo

AU - Obitsu, Taketo

AU - Lv, Renlong

AU - Tsumiyama, Yoshimasa

AU - Yasuda, Taisuke

AU - Wang, Zuomin

PY - 2018/1

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KW - Quick growth stage

KW - ITC-ISI-JOURNAL-ARTICLE

KW - UT-Hybrid-D

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