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The Potential of Spectral Measurements for Identifying Glyphosate Application to Agricultural Fields

1
Julius Kühn-Institut, Federal Research Centre for Cultivated Plants, Institute for Crop and Soil Sciences, Bundesallee 69, 38116 Braunschweig, Germany
2
State Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
3
Institute for Applied Ecology, Chinese Academy of Science, 72 Wenhua Road, Shenyang 110016, China
*
Author to whom correspondence should be addressed.
In memoriam Holger Lilienthal (1972–2020).
Agronomy 2020, 10(9), 1409; https://doi.org/10.3390/agronomy10091409
Received: 24 July 2020 / Revised: 1 September 2020 / Accepted: 11 September 2020 / Published: 17 September 2020
(This article belongs to the Section Precision and Digital Agriculture)
Glyphosate is one of the most widely used non-selective systemic herbicides, but nowadays its application is controversially discussed. Optical remote sensing techniques might provide a sufficient tool for monitoring glyphosate use. In order to investigate the potential of this technology, a laboratory experiment was set-up using pots with rolled grass sods. Glyphosate-treated plants were compared to drought-stressed and control plants. All pots were frequently measured using a field spectrometer and a hyperspectral-imaging camera. Plant samples were analysed for photosynthetic pigments, polyphenols and dry matter content. Eight selected vegetation indices were calculated from the spectral measurements. The results show that photosynthetic pigments were sensitive to differentiate between control and glyphosate treated plants already 2 days after application. From the vegetation indices, the normalized difference lignin index (NDLI) responded most sensitively followed by indices referring to photosynthetic pigments, namely, the carotenoid reflectance index (CRI-1) and the photochemical reflectance index (PRI). It can be concluded that spectral vegetation indices are, in principal, a suitable proxy to non-destructively monitor glyphosate application on agricultural fields. Further research is needed to verify its applicability under field conditions. An operational monitoring is, however, currently limited by the requirements for temporal and spectral resolution of the satellite sensors. View Full-Text
Keywords: chlorophyll; drought; glyphosate; polyphenols; spectral reflectance measurements; vegetation indices; remote sensing chlorophyll; drought; glyphosate; polyphenols; spectral reflectance measurements; vegetation indices; remote sensing
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MDPI and ACS Style

Bloem, E.; Gerighausen, H.; Chen, X.; Schnug, E. The Potential of Spectral Measurements for Identifying Glyphosate Application to Agricultural Fields. Agronomy 2020, 10, 1409. https://doi.org/10.3390/agronomy10091409

AMA Style

Bloem E, Gerighausen H, Chen X, Schnug E. The Potential of Spectral Measurements for Identifying Glyphosate Application to Agricultural Fields. Agronomy. 2020; 10(9):1409. https://doi.org/10.3390/agronomy10091409

Chicago/Turabian Style

Bloem, Elke, Heike Gerighausen, Xijuan Chen, and Ewald Schnug. 2020. "The Potential of Spectral Measurements for Identifying Glyphosate Application to Agricultural Fields" Agronomy 10, no. 9: 1409. https://doi.org/10.3390/agronomy10091409

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