This study aimed to investigate the effect of late-season drought stress and foliar application of zinc sulfate (ZnSO₄) and manganese sulfate (MnSO₄) on quantitative and qualitative traits of different rapeseed cultivars in 2 years. Treatments were included two levels of irrigation (normal and drought stress), four levels of micronutrient foliar application (water spraying, ZnSO₄, and MnSO₄, separately, and combined application of them), and three rapeseed cultivars (Nima, R15, and KS7). Results indicated that the qualitative and quantitative traits were significantly affected by irrigation, cultivars, and foliar application treatments. The highest seed oil content (43.9%), oil yield (2175.9 kg ha⁻¹), oleic acid (62.56%), and linoleic acid (17.25%) were obtained under normal irrigation conditions. Under drought stress conditions, oil quality decreased by increasing the amount of palmitic and erucic acids in all cultivars. Under drought stress conditions, foliar application of ZnSO₄ reduced the erucic acid, palmitic acid, and glucosinolate contents by 9.79%, 7.98%, and 2.80%, respectively, compared to control. Under drought stress conditions and combined application of ZnSO₄ and MnSO₄, the oleic acid and linoleic acid content were enhanced by 10.07% and 13.24%, respectively, compared to control. R15 indicated the highest yield (5261 kg ha⁻¹) under normal irrigation conditions, whereas, under drought stress conditions, the highest yield (3371 kg ha⁻¹) was observed in Nima. Therefore, introducing and diversifying rapeseed cultivars is one of the management tools in arid and semi-arid regions to achieve acceptable yield. The quality of canola oil degrades with environmental stresses, and foliar application of nutrients can moderate the effects of drought stress.

本研究旨在探讨在2年中后期干旱胁迫以及叶面施用硫酸锌（ZnSO ₄）和硫酸锰（MnSO ₄）对不同油菜品种的数量和质量性状的影响。处理方法包括两个级别的灌溉（正常和干旱胁迫），四个级别的微量营养元素叶面施用（分别喷水，ZnSO ₄和MnSO ₄以及它们的组合施用），以及三个油菜品种（Nima，R15和KS7）。结果表明，定性和定量性状受到灌溉，栽培品种和叶面施用处理的显着影响。最高的种子油含量（43.9％），产油量（2175.9 kg公顷^-1），在正常灌溉条件下获得油酸（62.56％）和亚油酸（17.25％）。在干旱胁迫条件下，通过增加所有品种中棕榈酸和芥酸的含量，油质会下降。在干旱胁迫条件下，与对照相比，叶面施用ZnSO ₄可使芥酸，棕榈酸和芥子油苷的含量分别减少9.79％，7.98％和2.80％。与干旱相比，在干旱胁迫条件下，ZnSO ₄和MnSO _{4的配合使用}，油酸和亚油酸含量分别提高了10.07％和13.24％。R15表明最高产量（5261 kg公顷^-1）在正常灌溉条件下，而在干旱胁迫条件下，尼玛观测到最高产量（3371 kg ha ^-1）。因此，引入油菜品种并使之多样化是干旱和半干旱地区获得可接受产量的管理手段之一。低芥酸菜籽油的品质会随着环境压力而降低，而叶面施用养分可以缓解干旱胁迫的影响。