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Aiming to address the problem of strip-tillers forming strips, a novel and adaptable strip seeding apparatus was introduced. This equipment represented a significant technological leap, which was capable of executing a wide array of strip patterns, ranging from uniform to non-uniform distributions. Its comprehensive scope encompassed multifaceted dimensions, notably focusing on the structural blueprint of the strip seeding apparatus. It included a detailed exposition of the intricate principles governing variable adjustments, an extensive analysis of the simulated effects under diverse configurations, and robust empirical validation through rigorous bench-scale testing. The EDEM simulation and benchtop experiments were utilized to test the variable adjustment performance of compound fertilizer and rice seed particles in the strip seeding device and the strip-forming effect under different variable adjustments was dynamically evaluated. Simulated results from the inlet feeding angle experiments showed that when conducted at a 70° angle, substantiating a gradual escalation in the coefficient of variation (CV), transitioning from the upper grid group (9%) to the lower grid group (27%), manifesting an 18% CV variance. This nuanced alteration barely disrupted particle flow, aligning meticulously with the intended uniformity envisaged in the design framework. The empirical findings regarding variable adjustment performance revealed stark disparities in granular flow among discharge tubes. The combination with the highest difference in compound fertilizer particle flow was Combination 8 (CV was 92%), with a maximum difference of 0.214 kg and the widest variable range (6%~41%). The combination with the smallest difference was Combination 11 (CV was 44%), with a minimum difference of 0.100 kg and the narrowest variable range (11%~27%). As for rice seed particles, the maximum difference also occurred in Combination 8 (CV was 90%) with a variable range of (5%~40%), while the minimum difference was in Combination 11 (CV was 40%) with a variable range of (11%~27%). Overall, there was a significant difference between the coefficient of variation and the variable range among the 12 combinations. The coefficient of variation for compound fertilizer particles ranged from 44% to 92%, with a variable range of 6% to 42%. The coefficient of variation for rice seeds ranged from 40% to 90%, with a variable range of 5% to 40%. Moreover, distinct configurations noticeably influenced particle quality alterations, facilitating differentiated adjustments in strip width and spacing between rows. This nuanced variation within similar variable adjustments further validated the instrument’s robustness in achieving finer gradations in strip width and spacing. The culmination of these in-depth investigations served as an invaluable guide for refining and optimizing this variable strip seeding apparatus. The research results can offer comprehensive technical solutions and a reservoir of foundational knowledge.