Nitrogen is an element that plays an essential physiological role in the plant in terms of protein synthesis, photosynthesis and the plant’s metabolism in general (synthesis of amino acids, hormone messengers, etc.). Available nitrogen also plays an oenological role because it impacts the must’s fermentability. The level of nitrogen is therefore an important factor to be measured since the berry touch stage.

Plots treated with the Oenoterris® Programmes have higher nitrogen content, which seems to indicate better nitrogen uptake, as shown by its dosage at the veraison stage. The box and whisker graph opposite shows medians (lines in the middle of the box) and means (crosses in the middle of the box) higher on the Oenoterris® modality, thus illustrating this trend.