In a study conducted in Manisa, Turkey, different irrigation programs were tested on seedless grapevines to see how they affected yield and quality. The researchers found that the amount of water used for irrigation significantly impacted the grape yield and quality. The highest yield was obtained when the vines received full irrigation throughout the growing season. It was also noted that reducing water by only 25% could still result in a good yield. Overall, providing adequate water during the entire growing season is crucial for achieving high grape yield and quality.