Potato seed piece spacing (SPS) is a determinant driver of tuber size profile and can be adjusted to maximize tuber yield. Three field trials were carried out in subtropical growing conditions to determine the response of SPS (e.g., 15, 20, 25, and 30 cm) on aboveground biomass, total tuber yield (TTY), tuber size distribution, and tuber quality of six table-stock potato cultivars. TTY and size distribution were affected by the length of the tuber bulking and weather conditions. Narrow SPS had an impact on TTY showing a linear decrease as SPS increased. Large tuber yield was higher when vine kill was conducted on 91 days after planting compared to 81 and 84. Cultivar showed variability in tuber size profiles. Red LaSoda and Satina yields were predominantly large tubers, Purple Majesty and Natascha had higher production of small tuber sizes. Adjusting SPS and cultivars can optimize tuber production and size distribution.

马铃薯种子块间距 (SPS) 是块茎大小分布的决定性驱动因素，可以进行调整以最大限度地提高块茎产量。在亚热带生长条件下进行了三项田间试验，以确定 SPS（例如 15、20、25 和 30 cm）对地上生物量、块茎总产量 (TTY)、块茎大小分布和六表块茎质量的响应- 马铃薯品种。TTY 和大小分布受块茎膨胀长度和天气条件的影响。窄 SPS 对 TTY 的影响随着 SPS 的增加呈线性下降。与 81 天和 84 天相比，在种植后 91 天进行藤蔓杀死时，大块茎产量更高。品种显示块茎大小分布的变异性。Red LaSoda 和 Satina 的产量主要是大块茎，而 Purple Majesty 和 Natascha 的小块茎产量更高。