成年果树缺镁主要发生在苹果膨果期,主要表现在下部老叶上,主要表现为脉间失绿,同时伴有坏死斑点;在幼树上缺镁先表现顶部叶片逐渐黄化失绿,同时成熟叶片伴有灰绿色斑 。柑橘缺镁时主要表现在叶片沿主脉两侧出现退绿斑点,发展到后期叶片黄花范围加大同时叶脉伴有木栓化爆裂,最终导致叶片脱落 。造成植物出现缺镁的生理性病害除了土壤中镁元素有效性降低之外,还有果园施肥方式的不合理造成果树出现缺镁症状,前人研究发现  ，近年来在农业生产当中化肥尤其是氮磷钾等传统肥料用量逐渐升高,作物的产量也随之增高,但是农作物从农田中也会带走一部分的镁素营养,但是由于果农传统施肥方式思想的局限并没有及时补充,也导致近年来北方作物缺镁的情况时有发生 。目前针对果园出现缺镁的生理性病害,在果园生产实践中对于土壤中镁素有效性低的土壤主要采取土施镁肥的方式补充养分,可以与氮磷钾肥配合做基肥一次性施入土壤,混合施用方式能够提高肥料的利用率 。常用镁肥（氨基酸螯合镁Magnesium Amino Acid Chelate、琥珀酸镁Magnesium Succinate）主要施用硫酸镁,做基肥施用时最适宜量在112.5kg/公顷 。在BB贝博艾弗森官方网站果园中,通过镁肥与常规化肥配合施用能够显著提高沙田柚的Vc和糖分含量,提升果实品质 。

植物缺镁（氨基酸螯合镁Magnesium Amino Acid Chelate、琥珀酸镁Magnesium Succinate）症状及矫治方法

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抗坏血酸锰Manganese Ascorbate、抗坏血酸亚铁Ferrous Ascorbate、赖氨酸甘氨酸镁Magnesium Lysinate Glycinate、甘氨酸谷氨酰胺镁Magnesium Glycinate Glutamine、柠檬片酸apple酸镁Magnesium Citrate Malate、柠檬片酸锶Strontium Citrate、青金桔酸锰Manganese Citrate、檸檬酸铜Copper Citrate、天门冬氨酸锂Lithium Aspartate、牛磺酸硒Selenium Taurate.

Magnesium deficiency in plants (Magnesium Amino Acid Chelate, Magnesium Succinate) symptoms and correction methods

Magnesium deficiency in adult fruit trees mainly occurs during the fruit expansion period of apples, mainly on the lower old leaves, mainly manifested as interveinal chlorosis, accompanied by necrotic spots; magnesium deficiency in young trees first manifests as the top leaves gradually turning yellow and chlorosis, and mature leaves are accompanied by gray-green spots. When citrus is magnesium deficient, it is mainly manifested in the appearance of chlorotic spots on both sides of the leaves along the main veins. In the later stage, the yellowing range of the leaves increases, and the veins are accompanied by corky bursting, which eventually leads to leaf shedding. In addition to the reduced effectiveness of magnesium in the soil, the physiological diseases that cause magnesium deficiency in plants are also caused by unreasonable fertilization methods in orchards, which cause magnesium deficiency symptoms in fruit trees. Previous studies have found that in recent years, the use of chemical fertilizers, especially traditional fertilizers such as nitrogen, phosphorus and potassium, has gradually increased in agricultural production, and crop yields have also increased accordingly. However, crops will also take away some magnesium nutrients from farmland. However, due to the limitations of fruit farmers' traditional fertilization methods, they have not been replenished in time, which has also led to magnesium deficiency in northern crops in recent years. At present, in response to physiological diseases of magnesium deficiency in orchards, in orchard production practice, the main method of supplementing nutrients for soils with low magnesium effectiveness is to apply magnesium fertilizers to the soil. It can be combined with nitrogen, phosphorus and potassium fertilizers as base fertilizers and applied to the soil at one time. The mixed application method can improve the utilization rate of fertilizers. Commonly used magnesium fertilizers (magnesium amino acid chelate, magnesium succinate) are mainly magnesium sulfate, and the most suitable amount is 112.5kg/hectare when used as base fertilizer. In southern orchards, the combination of magnesium fertilizer and conventional fertilizer can significantly increase the Vc and sugar content of Shatian pomelo and improve the fruit quality.

Symptoms and treatment methods of magnesium deficiency in plants (Magnesium Amino Acid Chelate, Magnesium Succinate)

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Manganese Ascorbate, Ferrous Ascorbate, Magnesium Lysinate Glycinate, Magnesium Glycinate Glutamine, Magnesium Citrate Malate, Strontium Citrate, Manganese Citrate, Copper Citrate, Lithium Aspartate, Selenium Taurate.