Egypt has a severe water shortage, made worse in recent years by the building of the Renaissance Dam. Thus, the purpose of this research is to assess the role of soil amendments in mitigating the negative influences of water stress and improving maize productivity. A field experiment was carried out at El-Gemmieza Agriculture Research Station, El-Gharbia Governorate, during the two successive summer seasons of 2021 and 2022 to study the influence of three levels of available soil moisture depletion (AVSMD) and soil amendments biochar (BC) and phosphogypsum (PG) on soil physical proprieties, some physiological traits and maize productivity (TWC 368). The experiment was laid out in a split-plot design with four replicates. The main plots were occupied by three levels of (AVSMD) irrigation at 50 % of AVSMD,I₁(moist);irrigation at 65 % of AVSMD,I₂ (medium) and irrigation at 80 % of AVSMD, I3 (dry). Whereas subplots contained six treatments of BC and PG singly or in combination, i.e., (T₁: control, T₂: 2 ton BC fad^-1, T₃: 4 ton BC fad^-1, T₄: 2 ton PG fad^-1, T₅: 4 ton PG fad^-1 and T₆: 2 ton BC fad^-1 plus 2 ton PG fad^-1).The results indicated that, increasing soil moisture stress up to (I₃) significantly decreased total porosity (Tp), soil hydraulic conductivity (Hc), organic matter (OM), available N, P, K, chlorophyll a (chl. a), b, shoot dry weight, leaf area (LA), leaf relative water content (LRWC),days to 50 % silking, plant height, antioxidant enzymes, ear length, 100- kernel weigh and grain yield, Whereas, bulk density (Bd),soil pH, chl. a/b ratio, proline and water measurements significantly increased in both seasons. Application (T₆) significantly increased all mentioned traits except Bd, pH, chl. a/b ratio, proline, water applied (WA) and water consumptive use (WCU). From the interaction between water stress treatments and soil amendments addition, It can be summarized that irrigation of maize plants at I₁ or I₂ with T6 improved pH, OM, available P and K, as well as achieved the highest values for chl. a, LA, LRWC, days to 50% silking, plant height, ear length, 100-kernel weight, grain yield, as well as improved water use efficiency (WUE) and water productivity (WP). While applying (I₂) with (T₆) recorded the highest values of Hc and antioxidant enzymes.