Decreases in grain yield and milling quality in the ratoon crop due to crushing damage to stubbles from mechanical harvesting of the main crop constrain the further extension of mechanized rice ratooning technology. Skip-row planting (SP), where the track zone is left untransplanted in the main crop to provide traffic paths for harvest machines, might be effective to alleviate these constraints by avoiding the crushing damage. However, it is remains unclear if border effects could compensate for the yield loss due to decreased planting density from SP in both the main and ratoon crops, and if SP could improve the milling quality of the ratoon crop. To address these questions, a SP pattern with 33.3% decrease in planting density was compared to conventional planting (CP) pattern in field experiments on mechanized ratoon rice in 2018 and 2019. Compared with CP, the grain yield of the main and ratoon crops in SP was reduced by 4.8% and increased by 4.6%, respectively. The large decrease in planting density from SP did not affect grain yield substantially because of the border effects on grain yield in the rows next to traffic paths in both crops. Panicle number, spikelet number panicle⁻¹, and total dry weight were responsible for the border effects on grain yield in the main crop, whereas panicle number and total dry weight were responsible for the border effects on grain yield in the ratoon crop. Milling quality of the ratoon crop was improved by SP, and the improvement in head rice rate was 2.5–7.0% compared with CP. Our results suggest that SP is effective for improving milling quality of the ratoon crop in mechanized rice ratooning system by avoiding the crushing damage, while maintaining high grain yield of the two crops due to the border effects.

主要作物机械收割对秸秆造成压碎损害，导致再生稻粮食产量和碾米质量下降，制约了水稻机械再生技术的进一步推广。跳行种植（SP），在主要作物中保留未移植的轨道区域以为收割机提供交通路径，可能通过避免压碎损坏来有效缓解这些限制。然而，目前尚不清楚边界效应是否可以弥补因 SP 对主要作物和宿根作物的种植密度降低而导致的产量损失，以及 SP 是否可以改善宿根作物的制粉质量。为了解决这些问题，在 2018 年和 2019 年机械化宿根稻田间试验中，将种植密度降低 33.3% 的 SP 模式与常规种植 (CP) 模式进行了比较。与CP相比，SP中主要作物和宿根作物的粮食产量分别减少4.8%和4.6%。SP 种植密度的大幅下降并没有显着影响粮食产量，因为两种作物对靠近交通路径的行中的粮食产量有边界效应。圆锥花序数、小穗数圆锥花序^-1和总干重是主要作物产量边界效应的原因，而穗数和总干重是宿根作物产量边界效应的原因。SP提高了宿根的出粉质量，整粒率比CP提高了2.5-7.0%。我们的研究结果表明，SP通过避免压榨损伤，有效提高机械化再生稻系统中再生作物的制粉质量，同时由于边界效应保持两种作物的高产量。