The article discusses managing crop water use efficiently with less water while still growing plants effectively. This method, called deficit irrigation, aims to provide only part of the water plants need during the growing season. It is crucial for farmers as water becomes scarce and expensive. The key challenge is finding the right balance to reduce plant stress without harming growth. Choosing when and how much to water plants becomes trickier under deficit irrigation. New technologies can help detect and manage plant stress for better results in farming.