This study was conducted to evaluate yield responses of four potato (Solanum tuberosum L.) cultivars (‘Russet Burbank’, ‘Shepody’, ‘Gold Rush’, and ‘Russet Prospect’) and soil N dynamic changes to two 3-year rotations in Prince Edward Island, Canada. The two rotations were the local industry standard potato–barley (Hordeum vulgare L.)–red clover (Trifolium pratense L.) rotation (PBC) and an alternative potato–soybean (Glycine max L.)–barley rotation (PSB). All potato cultivars received 170 kg N ha^− 1 input at planting without irrigation. Soil mineral N content before potato planting was significantly higher under the PBC rotation. However, the PBC rotation produced significantly lower yields, suggesting the possibility of excessive N supply from the plowed-down red clover. While cultivar and the interaction between cultivar and rotation did not show a significant difference in yield, yields of all cultivars were positively affected by the PSB rotation. The Gold Rush cultivar was affected the most (36%), followed by Russet Burbank (17%) and Prospect (14%) cultivars, with Shepody being the least affected (3%) by the alternative PSB rotation. Russet Burbank was the highest yielding cultivar under both rotations. With the three russet cultivars combined as a single russet cultivar, the PSB rotation significantly increased tuber yields, while the Shepody cultivar did not significantly benefit from the PSB rotation, suggesting that the russet cultivars responded more sensitively to the alternative rotation. Results demonstrate that adequately accounting for N supply from a preceding green manure crop is required for sustainable potato production in this humid temperate region.

本研究旨在评估四种马铃薯 ( Solanum tuberosum L.) 品种（'Russet Burbank'、'Shepody'、'Gold Rush' 和 'Russet Prospect'）的产量反应以及土壤氮对两个 3 年轮作的动态变化在加拿大爱德华王子岛。这两个轮作是当地行业标准的马铃薯-大麦 ( Hordeum vulgare L. )-红三叶草 ( Trifolium pratense L.) 轮作 (PBC) 和另一种马铃薯-大豆 ( Glycine max L.)-大麦轮作 (PSB)。所有马铃薯品种均获得 170 kg N ha ^{− 1}在不灌溉的情况下种植。PBC轮作下马铃薯种植前土壤矿物氮含量显着升高。然而，PBC 轮作产生的单产显着降低，这表明被耕作的红三叶草可能会提供过多的 N 供应。虽然品种和品种与轮作之间的相互作用在产量上没有显示出显着差异，但所有品种的产量都受到 PSB 轮作的积极影响。Gold Rush 品种受影响最大 (36%)，其次是 Russet Burbank (17%) 和 Prospect (14%) 品种，Shepody 受替代 PSB 轮作的影响最小 (3%)。Russet Burbank 是两次轮作中产量最高的品种。将三个赤褐色品种组合为一个赤褐色品种，PSB 轮作显着提高了块茎产量，而 Shepody 品种并没有从 PSB 轮作中显着受益，这表明赤褐色品种对交替轮作的反应更敏感。结果表明，在这个潮湿的温带地区，可持续马铃薯生产需要充分考虑先前绿肥作物的氮供应。