The effects of five water stresses (Stress in the 1st stage of fruit growth=SW1, stress the 2nd stage of fruit growth = SW2, stress in the 3rd stage of fruit growth = SW3, stress in the 1st and 2nd stages of fruit growth = SW4 and control plants=SW5) on the vegetative growth as well as fruiting of four peach cvs. (White Mashhad, Red & white Mash had, Red haven and G.H. Hale) were studied. The results indicated that water stress (in SW1, SW2. and SW4 treatments) severely decreased shoot length growth and leaf area in comparison to SW3 and SW5 treatments. There was no significant difference between water stress in stage 3 treatment and control plants. Water stress treatment in 1st stage treatment decreased the fruit density . A significant difference of 1% probability was shown in the 2nd and 3rd stages, and the control plants in water stress treatments. Water stress in the 1st and 2nd stages (SW4) had the highest yield and had a significant difference of 1% probability with water stress treatments in the 2nd and 3rd stages. No significant differences were found for diameter growth, leaf water potentials and flowreing density. This experiment was arranged in a completely randomized block design with splitted plots.
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