The scorching summer that Europe has just experienced has highlighted the importance of irrigation. The fact is that lack of irrigation unfortunately and very often has immediate and harmful effects on production. The catastrophic 2003 summer crop yields prove it! But on the other hand, too much water can result in negative results in terms of production quality. That is why more precise irrigation operation is now a necessity. Certain techniques of irrigation management are based on practices carried out in the field. Tensiometric probes are one of these techniques. They are simple and inexpensive devices that indicate the excess or lack of water in the soil. They can also save water while limiting risks to crops.