the effect of prd on changes of drought stress indices, nutritionantioxidant and photosynthesis activity of tomato

decreasing irrigation via partial root zoon drying (prd) save water and decreased production expenses. for comparing common irrigation and prd on tomato cv. falcato an experiment was designed in massey university of new zealand. treatments were control (irrigation in a field capacity in each irrigation to whole root zoon) and prd (irrigation in a half of field capacity in each irrigation to one side of root zoon). the results were shown that superoxide dismutase and peroxidase activity increased in prd compare with control. photosynthesis, mesophyll conductance, photosynthesis water efficiency, fresh and dry weight of root and shoot decreased in prd. nace (nutrient acquisition efficiency) of leaf was the highest for zn and na and the lowest for p when prd applied compare with control. yield indices like mp increased significantly by 63% compare to first harvest. ysi (yield stability index) increased by 46% in third harvest compare with second one. the tol (tolerance index) increased by 80% in last harvest compare with first one. gmp (geometric mean productivity) in the second harvest increased by 62% compare to first one.