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This study describes the results and conclusions obtained from vineyard zoning in Mendoza by using three vegetation indexes (NDVI, EVI and SAVI). Such indexes were calculated from spectral signals received by the Sentinel- A satellite in the days close to the 2017 harvest. With this information, maps from the plot of land with the zoning given by each index were obtained. Based on the NDVI zoning, a stratified sampling was carried out. On each stratum, 14 plants were marked and the production variables total weight of grape per plant, number of grape bunchs per plant and the weight of 50 berries were measured. The results showed that NDVI and SAVI led to similar classifications in terms of vineyard zones (strata), while EVI captures high vigor levels with less sensitivity. There was a correspondence between the production variables and the strata of high, medium and low vigor. The three indexes clearly showed two different vineyard areas in terms of production. Consequently, these indexes may contribute to rationalize viticulture practices, adjusting the intensity of such practices to the characteristics and needs of each of these vineyard areas.

This study describes the results and conclusions obtained from vineyard zoning in Mendoza by using three vegetation indexes (NDVI, EVI and SAVI). Such indexes were calculated from spectral signals received by the Sentinel-2A satellite in the days close to the 2017 harvest. With this information, maps from the plot of land with the zoning given by each index were obtained. Based on the NDVI zoning, a stratified sampling was carried out. On each stratum, 14 plants were marked and the production variables total weight of grape per plant, number of grape bunchs per plant and the weight of 50 berries were measured. The results showed that NDVI and SAVI led to similar classifications in terms of vineyard zones (strata), while EVI captures high vigor levels with less sensitivity. There was a correspondence between the production variables and the strata of high, medium and low vigor. The three indexes clearly showed two different vineyard areas in terms of production. Consequently, these indexes may contribute to rationalize viticulture practices, adjusting the intensity of such practices to the characteristics and needs of each of these vineyard areas. [ABSTRACT FROM AUTHOR]

'Bonarda' is the second most cultivated red variety in Argentina, mainly in the provinces of Mendoza and San Juan. In the past few years it has been valued for its great potential for the production of high quality wines. The origin of this variety was uncertain. The ampelographic description of the Argentine 'Bonarda' shows high level of similarity to the Italian variety 'Bonarda Piemontese,' and the French variety 'Corbeau'. However, recent work using molecular markers has shown that 'Bonarda' differs from 'Bonarda Piedmontese' and is identical to 'Corbeau'. The aim of this study was to confirm the identity of this variety using a larger number of microsatellite loci in such a way to cover, if possible, the entire genome. We analyzed 17 accessions of 'Bonarda' from the provinces of Mendoza and San Juan, Argentina, and the French variety 'Corbeau' with 13 microsatellite loci. All accessions of 'Bonarda' were identical to each other and to the French variety 'Corbeau', confirming that it is the same variety. It is proposed that the variety 'Bonarda' grown in Mendoza and San Juan is called 'Bonarda from Argentina' to distinguish it from the Italian Bonarda, but knowing, with a high confidence level, that corresponds to the noble French variety 'Corbeau'. [ABSTRACT FROM AUTHOR]