The study looked at how different irrigation levels affect raspberry yields. They found that raspberries need a lot of water to grow well, and drip irrigation can help with this. By testing different irrigation rates, they discovered that raspberries yield the most when watered at 100% of the recommended level. In dry years, irrigation led to a 67% increase in yield compared to not watering at all. In wetter years, the increase was 33%. This shows that drip irrigation is crucial for growing raspberries successfully in areas with low rainfall and high temperatures.