Comparative evaluation of vegetation indices to estimate yield level of Vicia villosa Roth in the Central-West Pampas, Argentine

Fabián Marini

Argentina

National Agricultural Technology Institute image/svg+xml

Agencia de Extensión Bahía Blanca de la Estación Experimental Bordenave

Nicanor Ponti González

Argentina

Universidad Nacional del Sur image/svg+xml

Instituto de Investigaciones en Ing. Eléctrica (UNS - CONICET), Depto. de Ingeniería Eléctrica y de Computadoras

María Belén D'Amico

Argentina

Universidad Nacional del Sur image/svg+xml

Instituto de Investigaciones en Ing. Eléctrica (UNS - CONICET), Depto. de Ingeniería Eléctrica y de Computadoras

Juan P. Renzi Pugni

https://orcid.org/0000-0002-1431-7776

Argentina

Instituto Nacional de Tecnología Agropecuaria – INTA Estación Experimental Hilario Ascasubi, Argentina

Depto. de Agronomía, Universidad Nacional del Sur

Guillermo R. Chantre

https://orcid.org/0000-0002-4424-0204

Argentina

Centro de Recursos Naturales Renovables de la Zona Semiárida image/svg+xml

Servicio Meteorológico Nacional (SMN)

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Accepted: 2026-03-30

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Published: 2026-05-13

DOI: https://doi.org/10.4995/raet.2026.25177
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Keywords:

legume, yield, model, estimation, vegetation indices

Supporting agencies:

This research was not funded

Abstract:

The increasing availability of high-resolution satellite imagery, georeferenced field measurements, and big data management tools facilitates the development of predictive models that improve agricultural planning. This type of support is particularly valuable in regions like the central-western pampas (Argentine) where the adoption of cover crops such as Vicia villosa Roth is limited due to their high yield variability. This study evaluates the individual capacity of different vegetation indices derived from Sentinel-2 imagery to serve as input variables in models for predicting vetch seed yield. Four groups of indices, calculated from different spectral bands and across multiple dates between vegetation growth and seed maturation were considered. For each index, temporal observations were stacked to form a multiband image and associated with yield measurements recorded by harvesters. Using this information, supervised classification models were trained and validated using the Random Forest algorithm. The study was conducted with available data from seven fields in the region. Results showed that indices derived from red-edge bands exhibited the highest discriminative capacity, even when the input stack was reduced to observations from the final stages of the crop phenological cycle. In addition, certain indices incorporating corrections related to soil background effects or photosynthetically active area also achieved high classification performance. This analysis contributes to establishing a solid base for developing a predictive tool applicable to vetch seed production in central-western Pampas.

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