Two field experiments were conducted in a new soil in the extension field in El Qantra- West, Ismailia Governorate, Egypt during 2017 and 2018 summer seasons. The study aimed to evaluate the effect of six exogenous application levels of ascorbic acid (AsA) and micronutrients mixture on yellow corn hybrid 352 (three way cross) under three amounts of irrigation water (3750, 3000 and 2250m3/fad of the estimated crop evapotranspiration) using surface irrigation system. Arandomized complete block split plot design with three replicates was used in each season. The irrigation treatments and the levels of AsA and micronutrients mixture were randomly allocated in the main and sub-plots, respectively. The most important findings could be summarized as follows:- Decreasing the amount of irrigation water from 3750 to 2250 m3/fad significantly diminished plant height,dry weight/plant, leaf dry weight/plant, ear leaf blade area, stem diameter, relative water content, total chlorophyll at 85 days from sowing. Also, at harvest, ear weight, ear length, ear diameter, 100-grain weight and grain yield/fad were decreased, but irrigation water use efficiency (IWUE) was significantly ameliorated. Generally, Foliar application by AsA or micronutrients mixture significantly increased these traits with increasing irrigation water use efficiency (IWUE) compared with their untreated analogues. The interaction between both studied factors showed that 350ppm AsA treatment protected about 500 kg/fad grains from collapse under moderate and severe water stress. Application of AsA saved approximately 750m3/fad of irrigation water without yield reduction under stress conditions.