The effects of different doses of super K in root and biomass(ground biomass,undo absorbent polymer(SAP) on leaf water potential,N,P and (ground biomass,total biomass),and root/shoot ratio of Prunus armeniaca were investigated in the Jiufeng experimental base.Leaf water potential of Prunus armeniaca was stimulated by SAP in a dose-dependent manner.The contents of N,P and K varied with different treatments.Specifically,the content of N increased significantly with the increase of SAP;N level under treatment of 20 g SAP was 1.66 times the contrast;K almost did not change;and the content of P was inhibited by SAP treatment.Total biomass and ground biomass increased in SAP treatment,whereas the maximums of underground biomass and root/shoot ratio occurred in contrast test.The content of N had a positive correlation with leaf water potential.The results suggest that the reason for good growth may be the water and fertilizer conservation effects of SAP on Prunus armeniaca.