The study looked at how different ways of watering walnut trees affect their ability to make food through photosynthesis. They found that the best way to water walnut trees is with a technique using 3 tubes, which helps the trees use water more efficiently. The researchers used a special machine to measure how well the trees were making food throughout the day. They discovered that the temperature, how much water the trees were losing, and how open their pores were all affected how well they could make food. Overall, watering walnut trees with 3 tubes is the best way to help them grow strong and healthy.