The main problems in some temperate fruit trees such as apple (Malus domestica) are poor fruit set and low yield. Polyamines and SICS (involving selected mineral nutrient such as manganese and boron) are the major chemical compounds used to reduce these concerns. According to above cases, the recent research was done using popular polyamines putrescine (Put) at 0.1, 0.25 mM, spermine (Spm) and spermidine (Spd) both at 0.05, 0.25 mM and SICS at 1, 2 mg L-1) alone or with cotton coverage bags and control to show the effects of these chemical compounds on yield indices and qualitative traits of apple (Malus domestica)cv ‘Red Delicious’.. Results showed that Spd (0.25 mM) and SICS (1 mg L-1) had higher effect on yield per weight and per fruit number, final fruit set and ISI, but Spd (0.25 mM) decreased final drop. Put (0.1 mM + ccb), Spd (0.25 mM) and SICS (2 mg L-1 + ccb) were the most suitable treatments in order to increase the qualitative characteristics.

Keywords