Abstract Drought is a burning issue all over the world that has led to remarkable reductions in the growth and yield of crops. Based upon the current problem, a series of two rain out shelter pot research experiments were performed to evaluate the drought tolerance in canola by foliar application of potassium (K) under water deficiency conditions in the Department of Agronomy, University of Agriculture Faisalabad, Pakistan. Four varieties of canola (Faisal Canola, Cyclone, Shiarlae, and Dunkled) were tested under two water deficit levels (100% FC and 50% FC) and two treatments of foliar potassium application i.e., 0% K and 2% K. The data was recorded with standard procedures when the plants were grown up to maturity. Results concluded that drought posed a significant decrease in all parameters under study. However, supplemental foliar application of potassium at the rate of 2% at both (vegetative and reproductive) stages of canola enhanced the water potential (0.24% and 0.23%), osmotic potential (0.12% and 0.11%), turgor pressure (0.66% and 0.58%), respectively. Similarly, the chlorophyll contents as chlorophyll a (0.25% and 0.28%), chlorophyll b (1.26% and 1.80%) and leaf carotenoid contents (0.20% and 0.62%) were also increased where K was applied at the rate of 2% during vegetative and reproductive stages of canola. The foliar applied K at the rate 2% enhanced leaf photosynthetic rate (13.11 µmol CO2 m−2 s−1 and 15.96 µmol CO2 m−2 s−1), transpiration rate (5.36 µmol CO2 m−2 s−1 and 5.54 µmol CO2 m−2 s−1) and stomatal conductance (0.22 µmol CO2 m−2 s−1 and 0.26 µmol CO2 m−2 s−1) of the plants at both stages. Yield attributes such as thousand seed weight (1.03% and 1.03%), seed yield (0.58% and 0.58%) and biological yield (0.35% and 0.38%) were increased by foliar K application under water deficit conditions at both stages. The genotype Shiralae showed significant improvement among all others genotypes under normal as well as water deficit conditions

中文翻译：

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在缺水条件下，叶面喷施钾肥可提高油菜的耐旱性

摘要 干旱是世界范围内的一个紧迫问题，导致农作物的生长和产量显着下降。基于当前的问题，巴基斯坦费萨拉巴德农业大学农学系在缺水条件下进行了一系列两个防雨棚盆研究实验，以评估通过在缺水条件下叶面喷施钾 (K) 的双低油菜籽的耐旱性。四种油菜品种（Faisal Canola、Cyclone、Shiarlae 和 Dunkled）在两种缺水水平（100% FC 和 50% FC）和两种叶面施钾处理（即 0% K 和 2% K）下进行了测试。数据当植物长到成熟时，用标准程序记录。结果得出结论，干旱使所研究的所有参数显着下降。然而，在双低油菜籽的两个（营养和繁殖）阶段以 2% 的比例叶面补充钾肥提高了水势（0.24% 和 0.23%）、渗透势（0.12% 和 0.11%）、膨压（0.66% 和 0.58） ％）， 分别。同样，叶绿素 a (0.25% 和 0.28%)、叶绿素 b (1.26% 和 1.80%) 和叶类胡萝卜素含量 (0.20% 和 0.62%) 的叶绿素含量也增加了，其中 K 的施用率为 2%双低油菜籽的营养和繁殖阶段。叶面施钾的速率提高了 2% 的叶片光合速率（13.11 µmol CO2 m-2 s-1 和 15.96 µmol CO2 m-2 s-1）、蒸腾速率（5.36 µmol CO2 m-2 s-1 和 5.54 µmol两个阶段植物的 CO2 m-2 s-1) 和气孔导度（0.22 µmol CO2 m-2 s-1 和 0.26 µmol CO2 m-2 s-1）。在缺水条件下，在两个阶段都通过叶面施钾增加了产量属性，例如千粒重（1.03% 和 1.03%）、种子产量（0.58% 和 0.58%）和生物产量（0.35% 和 0.38%）。在正常和缺水条件下，基因型 Shiralae 在所有其他基因型中表现出显着改善