Response of “Badamy sefid” Pistachio trees to spraying of fertilizer was studied over two years (2006–2007). The boron and zincfertilizer were used just on swelling time of female flower bud in compare to no fertilization (control). Also nutritional solution combined ofnitrogen (400 ppm), phosphorus (P2O5) (380 ppm), potasium (K2O) (520 ppm), Fe (5 ppm), Cu (2 ppm), Zn (2 ppm), Mn (2 ppm) in 1000liter water per hectare sprayed at first week of May, third week of June and July). The concentration of some macro and micro elements inflower bud and in leaves, also productivity (g/shoot sectional area) mean nut weight, fresh weight of nut per cm2 branch cross sectional area,blanks nuts %, non-split nut %, new shoot growth length after cessation of growth and remained flower bud (%) at the next spring wererecorded for the different treatments. The results showed that boron and zinc concentration increased in the bud of sprayed trees in compareto control. Application of nutritional solution decreased the flower bud abscission, also resulted in increased vegetative growth, nut weight,and productivity of trees. In conclusion, spraying of fertilizers in the suitable time to the pistachio trees might be a useful method indecreasing flower bud abscission and mitigating the alternate bearing
