Water stress alongside soil salinity constraint the productivity of crops. Application of beneficial microbes and natural extracts are considered new effective strategies used to develop plant adaptation under abiotic stress. Sugar beet plants were treated with phosphate solubilizing bacteria (PSB) and compost tea (CT), in a 2-year field experiment to explore the potential role of PSB, CT, and PSB + CT in enhancing plant growth, physiology, productivity, and sugar quality of sugar beet plant subjected to three watering regimes (1-well-watering (WW), 2-moderate drought (MD) and 3- severe drought (SD)) in salt-affected soil. Drought stress either under MD or SD conditions augmented ion imbalance followed by reducing the relative water content (RWC), relative membrane stability index (RMSI), stomatal conductance (gs), and chlorophyll content, which conflicted on the vegetative growth, root yield, sugar yield and quality. However, there were increases in osmolytes and activity of enzymatic antioxidants. Application of CT is more effective than PSB in motivating the activities of CAT, POD, SOD enzymes, and total soluble sugars (TSS). In contrast, CT application under MD conditions reduced glycine betaine (GB) and proline levels, reflecting on promoting the growth, physiological functions, and yield, subsequently restoring their levels under WW conditions. The combined treatment PSB + CT under moderate drought reduced GB and proline levels and enhanced the antioxidant system, RWC, RMSI, gs, chlorophyll, TSS, total leaves area, root length, root diameter, root yield, sugar yield, and quality. All types of additions under severe drought could not restore the yield of root and sugar to their levels under well-watering conditions. It was concluded that the coupled application of PSB and CT has beneficial effects on growth and quality of sugar beet growing under moderate drought in salt-affected soil.

水分胁迫和土壤盐分限制了作物的生产力。有益微生物和天然提取物的应用被认为是用于在非生物胁迫下发展植物适应性的新有效策略。在为期 2 年的田间试验中，用溶磷菌 (PSB) 和堆肥茶 (CT) 处理甜菜植物，以探索 PSB、CT 和 PSB + CT 在促进植物生长、生理、生产力和受盐影响土壤中三种浇水方式（1-井浇水（WW）、2-中度干旱（MD）和3-严重干旱（SD））的甜菜植株的糖质量。MD 或 SD 条件下的干旱胁迫增加了离子失衡，随后降低了相对含水量 (RWC)、相对膜稳定性指数 (RMSI)、气孔导度 (gs) 和叶绿素含量，在营养生长、根系产量、糖产量和品质上存在矛盾。然而，渗透物和酶促抗氧化剂的活性有所增加。CT 的应用比 PSB 更有效地激发 CAT、POD、SOD 酶和总可溶性糖 (TSS) 的活性。相比之下，MD 条件下的 CT 应用降低了甘氨酸甜菜碱 (GB) 和脯氨酸水平，反映了促进生长、生理功能和产量，随后在 WW 条件下恢复了它们的水平。中度干旱条件下PSB+CT联合处理降低了GB和脯氨酸水平，增强了抗氧化系统、RWC、RMSI、gs、叶绿素、TSS、总叶面积、根长、根直径、根产量、糖产量和质量。在严重干旱下的所有类型的添加都无法将根和糖的产量恢复到浇水良好的条件下的水平。结论：PSB与CT联用对盐渍土中度干旱条件下甜菜的生长和品质具有有益的影响。