Welcome to the wonderful world of agro-œnology! For too long, œnology and viticulture have operated each separately with minimal interactions. No longer. The concept of agro-œnology is to manage the vine early by optimizing its nutrition during summer as to obtain quality grapes for harvest. Petiolar analysis is therefore used as an œnological tool in addition of identification of deficiencies. So what are the benefits of petiolar analysis? When combined to soil analysis, petiolar testing is extremely informative to characterize the vintage. Comparing results from year to year helps determine corrective actions to take.

Feuille avec pétiole et tige

What is a petiole? It is the part linking the leaf to the vine stem.

What is its function? The petiole helps position the leaf towards the light. The petiole isn’t an organ involved in nutrient storage. When we harvest petioles, we are evaluating the nutritional state of the vine at a specific point and time.

Why analyze petioles? This type of test answers 2 critical questions: 1) What is the current nutritional state of the vine? 2) Does a situation observed on the leaf is caused by a nutritional deficiency?

The first benefit is, without contest, the ability to follow dynamics of metal assimilation in the plant in real time. Samples are taken at three different stages: Flower Cluster Initiation, Pea Size and Veraison. The second benefit will be to adapt the fertilisation plan with precision based on results from the previous sampling.

Petiolar analyses include the following elements: Nitrogen, Potassium, Phosphorus, Calcium, Magnesium, Iron, Manganese, Bore, Zinc, Copper. Approximately 80 petioles per plot are required for testing. More information on how to collect samples can be found here in the tab “Downloads”. Interested in this new informative service? Please fill out our Analytical Request Form and ensure to use paper envelopes to send samples. Samples in plastic bags will lead to mold development.

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