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The measurement of spectral values of tea plants under various conditions using reflectance from a spectroradiometer has been conducted in this study. The objective of this research is to analyze reflectance values from proximal sensors and to evaluate the span of vegetation indices (VIs) values. Based on field observation, three plant conditions were found, i.e., healthy tea plants (HT), unhealthy tea plants (UHT), and rejuvenation tea plants (RT). Spectral value data were obtained from field measurements and recordings using the ASD Fieldspec Handheld Spectroradiometer 2 (HHS2). Five plant samples for each condition were recorded ten times and were managed using ViewSpecPro.Inc. software. The results of spectral values measurement from HHS2 of HT, UHT, and RT were 0.03–0.59, 0.03–0.57, and 0.05–0.60, respectively. The research found that some vegetation indices were less sensitive to changes in plant conditions. However, Normalized Difference Vegetation Index (NDVI) and Soil Adjusted Vegetation Index (SAVI) exposed more variability and more responsive to differences in plant health. Near Infrared wavelength was shown the most promising spectrum to distinguish plant categories.

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Field Spectroscopy of Healthy and Unhealthy Tea Plants (Camellia assamica L.)

  • 会议论文

  • 发表日期：

    2026年

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  • Rachmat Abdul Gani,
  • Bambang Hendro Trisasongko,
  • Budi Mulyanto,
  • Sukarman Sukarman,
  • Destika Cahyana

摘要

The measurement of spectral values of tea plants under various conditions using reflectance from a spectroradiometer has been conducted in this study. The objective of this research is to analyze reflectance values from proximal sensors and to evaluate the span of vegetation indices (VIs) values. Based on field observation, three plant conditions were found, i.e., healthy tea plants (HT), unhealthy tea plants (UHT), and rejuvenation tea plants (RT). Spectral value data were obtained from field measurements and recordings using the ASD Fieldspec Handheld Spectroradiometer 2 (HHS2). Five plant samples for each condition were recorded ten times and were managed using ViewSpecPro.Inc. software. The results of spectral values measurement from HHS2 of HT, UHT, and RT were 0.03–0.59, 0.03–0.57, and 0.05–0.60, respectively. The research found that some vegetation indices were less sensitive to changes in plant conditions. However, Normalized Difference Vegetation Index (NDVI) and Soil Adjusted Vegetation Index (SAVI) exposed more variability and more responsive to differences in plant health. Near Infrared wavelength was shown the most promising spectrum to distinguish plant categories.