Profitable canola production depends upon an adequate supply of nitrogen (N) and sulfur (S) fertilizer. However, agricultural soils in eastern Canada seldom receive S fertilizer and rely on inherent S supply from biogeochemical and anthropogenic sources, which could be a yield-limiting factor for canola. The objective of this study was to document N × S fertilizer interactions to develop site-specific best management practices for canola production in eastern Canada. Factorial field experiments were conducted for four consecutive cropping seasons at five locations across eastern Canada. The N × S and N × S × environment interactions on seed yields and yield-related traits were visualized with the graphical analytical genotype and genotype-by-environment biplot tool. The highest seed yield was achieved with 150 kg N ha⁻¹ together with 20–40 kg S ha⁻¹ in 15 of the 19 test site-years. Seed yield was closely related to harvest index and number of seeds pod⁻¹. Fertilizing canola with 20 kg S ha⁻¹ enhanced the nitrogen use efficiency (NUE) of canola receiving 75 kg N ha⁻¹, but the benefit of S fertilizer on NUE was negligible when N fertilizer rates increased to 150 kg N ha⁻¹. Since canola yield response to fertilizer inputs varied from one site to another, due to the variation in environmental and soil conditions, we conclude that N × S fertilizer recommendations for canola production need to be developed on a site-specific basis in eastern Canada.

双低油菜籽生产的盈利取决于氮（N）和硫（S）肥料的充足供应。但是，加拿大东部的农业土壤很少获得硫磷肥料，并且依赖于来自生物地球化学和人为来源的固有硫供应，这可能是油菜的产量限制因素。这项研究的目的是记录N×S肥料的相互作用，以开发针对加拿大东部双低油菜籽生产的特定场所最佳管理方法。在加拿大东部的五个地点进行了连续四个种植季节的析因田间试验。利用图形分析基因型和按环境划分的基因图工具可视化了N×S和N×S×环境对种子产量和产量相关性状的相互作用。150 kg N ha ^-1达到最高种子产量在19个测试站点年中的15年中，以及20–40 kg S ha ^-1。种子产量与收获指数和种子荚^-1的数量密切相关。施以20 kg S ha ^-1的低芥酸菜子能提高接受75 kg N ha ^-1的低芥酸菜子的氮素利用效率（NUE），但是当N施肥量增加至150 kg N ha ^-1时，S肥料对NUE的好处微不足道。由于环境和土壤条件的变化，双低油菜籽对肥料投入的产量响应因地而异，因此我们得出结论，加拿大东部的双低油菜籽生产的N×S施肥建议需要针对特定​​地点制定。