The study compared five different types of apple trees grown in Iran to see which one grew the best and produced the most fruit. They used a special method to train the trees and watered them with a drip system. The results showed that 'Golab-kohans' grew the biggest, 'Delbar estival' produced the most fruit, 'Starking' had the firmest fruit, 'Gala' had the sweetest fruit, and 'Fuji' had the highest fruit sunburn.