CONTEXT Research has demonstrated that relationships exist between berry compositional changes during ripening and seasonal vine water deficit variations (here). The purpose of this blog is to highlight the specific relationship between berry sugar accumulation dynamics and seasonal vine water use. The results discussed in this study aim at improving winegrower practices […]

  CONTEXT Regardless of irrigation regime, canopy size can affect yield and berry quality attributes particularly under semiarid conditions. It may sound counterintuitive at first but, despite their “luxuriant look”, vines with higher canopies often experience a greater degree of water stress towards the end of the season. If there […]

Why Use the Two Color Map? Multiplex two color mapping is useful to support the following question around picking decision timing: “Can I source enough fruit from a uniformly colored area to fill one tank size at harvest?“ The multiplex two color mapping helps highlight areas with different color concentrations within your vineyard. The speed […]

CONTEXT An australian researcher team led by Cooley have compared different levels of water deficit severity to analyze their effect on berry and wine composition (Cabernet Sauvignon). Interestingly their results show that the more limited irrigation regime, (ie. the  “prolonged” deficit irrigation) can improve the consistency of wine quality. By […]

Introduction Vines with too much yield are often maturing too slowly or producing a fruit of suboptimal quality for wine. A typical practice to reduce yield and hasten maturity with high vigor vines consists of shoot thinning. The removal of undesired shoots reduces canopy density and crop load. However, if this […]

What is the  relationship between fruit color and wine color concentration? A strong, positive relationship exists between  anthocyanin (i.e. color)  concentration in grape and in wine (source). However, all anthocyanins accumulated in the skin are not completely extracted into the wine. For that reason, even if a relationship exists, the total amount of anthocyanins  extracted […]

The concept of growing degree days (GDD) Vineyards are particularly sensitive to climate and especially temperature. That is why phenological vine data has been used to reconstruct temperature series over long past periods (Le Roy Ladurie, 1971; Chuine et al., 2004). For example, Garcia de Cortazar Atauri et al. (2005) […]

One of the main challenges for a winegrower before harvest is : “where is it best to sample?” and “how many locations do I need to sample to get a reliable estimate?” In this blog we discuss how to design a sampling scheme to best capture vineyard spatial variability. The plant […]

NDVI is an English acronym meaning Normalized Difference Vegetation Index, which could be translated as a Normalized Vegetation Index. This index reflects the quantity of so-called “photosynthetically active” biomass. It is calculated according to the formula: Where R and PIR are respectively reflectances measured in the red and near infrared […]