Northwestern coastal region of Egypt is characterized by severe slop nature, which makes it more vulnerable to soil erosion by water. In addition to losing the fertile topsoil layer, which causes its degradation and low productivity. This research aims to mitigate water soil erosion by applying a reservoir tillage system by locally manufacturing a planting and reservoir tillage machine (PRT). In addition to conducting wheat crop mechanical planting in one pass. A field experiment was conducted under wheat crop rainfed condition on a sandy loam soil in Wadi El Raml during winter cultivation season of 2021-2022. This field experiment aims to investigate the effect of using a reservoir tillage system and organic fertilization on mitigation water soil erosion under rainfed condition. The statistical design of the experiment was a split plot with three replicates for each treatment. Main plots included two fertilization rates of farmyard manure of 0 and 25 m3/ha. Sub main plots included three types of pits' dimensions which were 0.50×0.14×0.20 m (PD1), 0.60×0.17×0.14 m (PD2) and 0.70×0.20×0.10 m (PD3) for length× width× depth m, respectively with same volume of 10.35 liters. In addition to traditional cultivation as control treatment with three replicates. The results revealed that using the PRT machine at pit dimensions of PD1 with the addition of farmyard manure decreased the rainwater surface runoff and soil loss by about 85.67% and 74.76%, respectively, while increased wheat grain and straw yields and net profit by about 88.44% 79.69% and 73.97%, respectively, compared to traditional cultivation.