Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Time-Series of Vegetation Indices (VNIR/SWIR) Derived from Sentinel-2 (A/B) to Assess Turgor Pressure in Kiwifruit

Version 1 : Received: 25 September 2020 / Approved: 26 September 2020 / Online: 26 September 2020 (12:07:40 CEST)

How to cite: Jopia, A.; Zambrano, F.; Pérez-Martínez, W.; Vidal-Páez, P.; Molina, J.; De la Hoz Mardones, F. Time-Series of Vegetation Indices (VNIR/SWIR) Derived from Sentinel-2 (A/B) to Assess Turgor Pressure in Kiwifruit. Preprints 2020, 2020090625 (doi: 10.20944/preprints202009.0625.v1). Jopia, A.; Zambrano, F.; Pérez-Martínez, W.; Vidal-Páez, P.; Molina, J.; De la Hoz Mardones, F. Time-Series of Vegetation Indices (VNIR/SWIR) Derived from Sentinel-2 (A/B) to Assess Turgor Pressure in Kiwifruit. Preprints 2020, 2020090625 (doi: 10.20944/preprints202009.0625.v1).

Abstract

For more than ten years, Central Chile faces drought conditions, which impact crop production and quality, increasing food security risk. Under this scenario, implementing management practices that allow increasing water use efficiency is urgent. The study was carried out in kiwifruit trees, located in the O’Higgins region, Chile; for season 2018-2019 and 2019-2020. We evaluate nine vegetation indices in the VNIR and SWIR regions derived from Sentinel-2 (A/B) satellites to know how much variability in the canopy water status could explain. Over the study's site were installed sensors that continuously measure the leaf's turgor pressure (Yara Water-Sensor). A strong correlation between turgor pressure and vegetation indices was obtained with the Spearman's rho coefficient ($\rho$). However, the NIR range's indices were influenced by the vegetative development of the crop rather than its water status. Red-edge showed better performance as the vegetative growth did not affect it. It is necessary to expand the study to consider higher variability in kiwifruit's water conditions and incorporate the sensitivity of different wavelengths.

Subject Areas

Turgor; Sentinel-2; Vegetation spectral indices; Kiwi; SWIR/NIR; time-series

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