Sclerotinia stem rot (SSR) is a major fungal disease of oilseed rape (Brassica napus L.) that causes severe yield losses. Nutrient management is crucial for protecting crops against SSR. Two‐yr field trials combined four levels of N application (0, 90, 180, and 270 kg N ha⁻¹) and four levels of K application (0, 60, 120, and 180 kg ha⁻¹ K₂O) to investigate their interaction effects on SSR disease incidence and seed yield loss caused by SSR. Compared to the sole application of N, the combined application of N and K decreased the SSR disease incidence by 9.9–24.4 and 17.4–37.9% in 2016–2017 and 2018–2019, respectively. N application increased the severity of SSR only at lower K application rates (0 and 60 kg ha⁻¹ K₂O). Additionally, compared to the sole application of N, the co‐application of N and K dramatically decreased the total yield loss rate (TYLR), by 31.1–60.9 and 19.2–60.3% in 2016–2017 and 2018–2019, respectively. The seed yield response to N uptake was dependent on the level of K application. However, SSR disease dramatically decreased the nutrients use efficiency. Nitrogen and K supply showed synergistic interaction effects on N and K recovery efficiency. These results emphasized the importance of N and K co‐application on reducing the yield loss caused by SSR infection. For a stabilized seed yield, an adequate N (180 kg ha⁻¹) application rate combined with a slightly high K application rate (120–180 kg ha⁻¹) represents a feasible nutrient management strategy for oilseed rape against SSR disease.

中文翻译：

---

氮钾结合施用减少了核盘菌茎腐病引起的油菜种子产量损失

核盘菌茎腐病（SSR）是油菜（甘蓝型油菜）的一种主要真菌病，会导致严重的产量损失。营养管理对于保护作物免受SSR危害至关重要。两年的田间试验将四个水平的N施肥（0、90、180和270 kg N ha ^-1）和四个水平的K施肥（0、60、120和180 kg ha ^-1 K ₂ O）结合到研究它们的相互作用对SSR病害发生和SSR造成的种子产量损失的影响。与单独施用N相比，N和K的联合施用分别在2016-2017年和2018-2019年将SSR疾病的发病率分别降低了9.9–24.4和17.4–37.9％。仅在较低的钾肥施用量（0和60 kg ha ^-1时，氮肥施用会增加SSR的严重性K ₂ O）。此外，与单独施用N相比，N和K的共同施用显着降低了总产量损失率（TYLR），在2016-2017年和2018-2019年分别降低了31.1–60.9％和19.2–60.3％。种子对氮素吸收的产量响应取决于施钾水平。然而，SSR病大大降低了养分的利用效率。氮和钾的供应对氮和钾的回收效率具有协同作用。这些结果强调了氮和钾共施用对减少SSR感染引起的产量损失的重要性。为了使种子产量稳定，适当的氮肥施用量（180 kg ha ^-1）和略高的钾肥施用量（120–180 kg ha ^-1））代表了针对SSR疾病的油菜油菜可行的养分管理策略。