Abstract: The traditional fertilization methods for summer corn in the Huang-Huai-Hai region of China, such as one-time basal application ("one-shot") or base-topdressing splits, often lead to irrational fertilizer structure, a significant mismatch between nutrient supply and crop demand. To address these challenges, this study integrates the spatial distribution advantages of layered fertilization with the controlled-release characteristics of specialized fertilizers, proposing a novel V-shaped layered fertilization method and its corresponding mechanical device. The research was systematically conducted through pot experiments, device design, discrete element simulation, and field validation. Pot experiments were set up with seven treatments (CK, T2,T3,T4,T5,T6,T7) to investigate the effects of different fertilizer types conventional urea and controlled-release urea and application methods single-side, bilateral, bilateral and bottomon maize agronomic traits, soil nitrogen dynamics ammonium-N and nitrate-N, and yield. Based on the optimal fertilization strategy (T7) identified from the pot experiments, a V-shaped layered fertilization planter was designed. Its core component, the double-disc opener, was theoretically analyzed to determine the preliminary ranges of its structural parameters disc diameter, disc angle and operational parameter forward speed. Using the Discrete Element Method (EDEM), a simulation model of the opener-soil-fertilizer interaction was established. A quadratic orthogonal rotational combination design was employed with disc diameter, disc angle, and forward speed as experimental factors, and operational resistance and fertilization qualification rate as performance indicators. Regression models were developed and optimized to determine the optimal parameter set. Field trials were carried out to verify the operational performance of the prototype manufactured with the optimized parameters, including fertilization positioning accuracy, its impact on root development, and final yield. Pot experiment results showed that the T7 treatment controlled-release urea blended with conventional PK fertilizer applied bilaterally and at the bottom in a 30%, 30%, 40% ratio significantly increased maize stem diameter, leaf area, and chlorophyll content compared to other treatments（P＜0.05）. More importantly, it maintained significantly higher levels of soil ammonium-N and nitrate-N during the later growth stages flowering and maturation, effectively preventing nitrogen deficiency and aligning nutrient release with crop demand. Consequently, the yield under T7 treatment reached 31.705 g, which was significantly higher than all other treatments（P＜0.05）. Simulation results derived the optimal parameter combination: disc diameter of 360.75 mm, disc angle of 10.97°, and forward speed of 4.26 km/h. Under this combination, the predicted operational resistance was 239.71 N, and the fertilization qualification rate was 95.69%. Field validation confirmed the high performance of the device. The measured fertilization positions were highly accurate, with an average vertical distance of 39.6 mm for side fertilizer to the seed, a horizontal distance of 99.4 mm between side fertilizer bands, and a vertical distance of 110.7 mm for base fertilizer to the seed, all within a 10 mm error margin from the design targets. Comparative trials demonstrated that the V-shaped fertilization (VF) treatment significantly promoted root growth, resulting in longer, denser root systems with more aerial roots compared to conventional fertilization (CF). Ultimately, the V-shaped fertilization (VF) treatment achieved a 100-grain weight of 37.42 g and a yield of 11100 kg/hm², which were significantly greater than the conventional fertilization (CF) treatment's 31.85 g and 9520 kg/hm² (P < 0.05), representing a yield increase of 16.6%. The V-shaped layered fertilization method combining controlled-release and conventional fertilizers effectively achieves precise spatial and temporal nutrient supply, significantly enhancing nitrogen utilization efficiency, promoting maize root and shoot development, and increasing yield. The supporting device, optimized through discrete element simulation, features rational design and stable performance, meeting the agronomic requirements for precise fertilization. This integrated approach provides a theoretical foundation and effective technical solution for simplified, efficient, and high-yield maize cultivation practices.