The article discusses how to best use water for growing crops in areas where water is limited or expensive. The researchers created a math model to figure out the best way to divide water between different crops. They found that by using this model, farmers can decide how much water to give each crop to get the most out of their fields. By changing the type of crops grown and how much water is used, farmers can increase their crop production efficiently. This model helps farmers plan how to use water wisely for growing different crops.