[Objective] The aim was to compare effects of nitrogen and potassium fertigation on yield and quality of pineapple during the late growing period. [Method] Urea, potassium sulfate, and potassium chloride were taken as three fertilizers which were set at three levels, respectively, and the group without additional fertilizers was taken as control group. [Result] Compared with control group, weight of individual pineapple was significantly increased by fertigation of urea at 7.5 kg or potassium sulfate at 18 kg per 667 m 2 and the increase yields were 22.5% and 28.9%, respectively. Effects of nitrogen and potassium fertigation on yield and quality of pineapple were compared. [Conclusion] Potassium sulfate fertigation would promote sugar accumulation and improve quality of fruits. Furthermore, chlorophyll content can be enhanced and photosynthetic capacity can be reinforced.
