Soil acidity is one of the most important soil constraints for wheat growth, and magnesium (Mg) can play a critical role in mitigating the adverse effects of soil acidity on plants. There is, however, limited information available about the influence of Mg nutrition, especially foliar application, on wheat (Triticum aestivum) growth in acidic soil. In a series of glasshouse experiments, Al‐sensitive wheat genotype (ES8) was grown to vegetative stage (Zadoks 23) with or without foliar Mg application at different rates (0, 50, 200 and 1,000 mg Mg/L), and acidic soil was used as the growth medium with or without lime and Mg amendment. The effects of these treatments on plant growth, physiological responses, tissue concentration of Mg, dry biomass accumulation and root length were characterized. Magnesium application to foliage significantly increased (by around 14%) both shoot and root dry biomass compared to the control (0 foliar Mg). No significant variation was observed in response to different Mg salts (sulphate or chloride) applied to either soil or foliage in relation to wheat growth and physiological responses. Other than liming, foliar Mg application (200 mg Mg/L) coupled with Mg application to soil (20 mg/kg soil) provided optimum conditions for wheat growth in an acid soil. Leaf extension rate, chlorophyll content and root length of wheat treated with 200 mg Mg/L foliar application were increased significantly (by 12%, 10% and 23%, respectively) in comparison to plants treated with 0 foliar Mg. Physiological parameters such as net photosynthetic rate, transpiration rate and stomatal conductance were 4‐fold higher in foliar Mg‐treated plants compared with those receiving no foliar Mg. Therefore, applying 200 mg Mg/L to the foliage may assist in minimizing the negative impact of soil acidity on wheat growth.

中文翻译：

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叶面施用镁可缓解小麦的土壤酸度胁迫

土壤酸度是影响小麦生长的最重要的土壤限制因素之一，镁（Mg）在减轻土壤酸度对植物的不利影响方面可以发挥关键作用。但是，关于镁营养（尤其是叶面施肥）对小麦（小麦）的影响的信息有限。）在酸性土壤中生长。在一系列温室试验中，对铝敏感的小麦基因型（ES8）生长到营养期（Zadoks 23），无论是否施用叶面镁（不同的施用量，分别为0、50、200和1,000 mg Mg / L），以及酸性土壤用作有或没有石灰和镁改性剂的生长培养基。表征了这些处理对植物生长，生理反应，镁组织浓度，干生物量积累和根长的影响。与对照（0叶面镁）相比，枝叶和根部干燥生物量的镁施用量均显着增加（约14％）。没有观察到与小麦生长和生理反应有关的施用于土壤或树叶的不同镁盐（硫酸盐或氯化物）的显着变化。除了撒石灰 叶面施镁（200 mg Mg / L）加上施镁于土壤（20 mg / kg土壤）为酸性土壤中的小麦生长提供了最佳条件。与0叶量Mg处理的植物相比，200 mg Mg / L叶面施用的小麦的叶片伸长率，叶绿素含量和根长显着增加（分别增加了12％，10％和23％）。叶面镁处理过的植物的生理参数，例如净光合速率，蒸腾速率和气孔导度，比不接受叶面镁的植物高4倍。因此，在叶子上施用200 mg Mg / L可以帮助最小化土壤酸度对小麦生长的负面影响。与0叶量Mg处理的植物相比，以200 mg Mg / L叶面处理的小麦的叶绿素含量和根长显着增加（分别增加了12％，10％和23％）。叶面镁处理过的植物的生理参数，例如净光合速率，蒸腾速率和气孔导度，比不接受叶面镁的植物高4倍。因此，在叶子上施用200 mg Mg / L可以帮助最小化土壤酸度对小麦生长的负面影响。与0叶量Mg处理的植物相比，以200 mg Mg / L叶面处理的小麦的叶绿素含量和根长显着增加（分别增加了12％，10％和23％）。叶面镁处理过的植物的生理参数，例如净光合速率，蒸腾速率和气孔导度，比不接受叶面镁的植物高4倍。因此，在叶子上施用200 mg Mg / L可以帮助最小化土壤酸度对小麦生长的负面影响。与未接受叶面镁的植物相比，叶面镁处理的植物的蒸腾速率和气孔导度高4倍。因此，在叶子上施用200 mg Mg / L可以帮助最小化土壤酸度对小麦生长的负面影响。与未接受叶面镁的植物相比，叶面镁处理的植物的蒸腾速率和气孔导度高4倍。因此，在叶子上施用200 mg Mg / L可以帮助最小化土壤酸度对小麦生长的负面影响。