الفهرس 
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Abstract
An experimental field trial was carried out in Egypt’s Wadi El Natrun Beheira Province between the growing seasons of 2019 and 2020 (latitude: 30.42 N, longitude: 30.33 E). The goal of the study was to assess how varying rates of mineral and biofertilizers and irrigation techniques affected potato yield and water use efficiency. Three rates of mineral fertiliser (100, 75, and 50% of MF) alone or in combination with biofertilizer (BF), which was made up of (Azoasperilum + Bacillus megaterium), were used in the field trial, which was set up in a split-plot design. Additionally, two potato cultivars were used (Bellini C1 and Arizona C2). The interaction between I1, 100% MF or (100% MF+ BF) and C1 or C2 cultivars resulted in significantly different growth and yield characteristics for leaf area, productivity, and grading (Potato Size < 30mm and > 50mm (%)), as well as the amount of nitrogen and phosphorus in the leaves over the course of the two growing seasons. Only in the grading trait (Potato Size > 30mm (%)) were there variations that were statistically significant for the interaction I2 + C1 + 50% MF. The highest significant results for the grading were obtained from the interaction (I1 or I2 + C1 or C2 + 75% MF), which was equivalent in strength (Potato Size < 50mm (%)). The (I1 + C1 or C2 + 100% MF+BF) treatments are suggested as the best options for potatoes grown in fields since drip irrigation delivered more water and significantly improved most potatoes growth features when compared to micro-sprinkler irrigation.
Keywords: Irrigation system; Potatoes; Mineral fertilization; Bio-fertilization; Water productivity.