Magnesium is a component of chlorophyll and it is an activator of many enzymes. It is involved in fat metabolism and nitrogen metabolism and is very important for regulating the activity of enzymes in plants. Magnesium content itself is an important quality standard. Magnesium supplementation can increase production, and appropriate magnesium application can increase chlorophyll, carotene and carbohydrate content. First, the symptoms of vegetables magnesium deficiency magnesium deficiency, post-growth disease, prominent performance is the decline in chlorophyll content, and the emergence of chlorosis, often from the lower old leaves began to lose their green, and gradually developed on the new leaves. The leaves of the dicotyledonous vegetables turn yellow and chlorotic. The veins are still green, and gradually change from light green to yellow or white. There are brown or purple spots or stripes of different sizes. When the magnesium is severely deficient, the leaves of the entire plant Necrosis occurs. Root-to-crown ratio decreased, flowering was inhibited, and flowers were pale in color. 1. The magnesium deficiency and magnesium deficiency of the early stage of the soybean become dark green, then turn deep yellow, and brown dots occur. However, the leaf base and veins remain green near the leaf, and the leaf margin curls downward, and the edge is turned inward. Yellow, mature early, yield is not high. 2. Tomato deficiency magnesium leaf veins chlorotic tissue, and the development of leaf margins, moderate growth of normal stems and leaves lack of magnesium, magnesium deficiency extended to small veins, only the main stem is still green, and finally the whole plant yellow. 2. Symptoms of Over-application of Magnesium in Vegetables Under field conditions, there are generally no symptoms of malnutrition caused by excessive magnesium production. However, sometimes too much magnesium can cause the root development to be hindered, and the xylem in the stem is underdeveloped. III. Magnesium Fertilizer Types Applied to Vegetables and Application Techniques Magnesium-containing fertilizers commonly used include magnesium sulfate, magnesium chloride, magnesium nitrate, magnesium oxide, potassium magnesium fertilizer and other water-soluble magnesium fertilizers, which are soluble in water and are easily absorbed and utilized by crops. Magnesium, magnesium phosphate fertilizer, magnesium ammonium phosphate, dolomite and other fertilizers also contain magnesium, which is slightly water-soluble or hardly soluble in water and has a slow fertilizer effect. It is suitable for acidic soils. 1. Magnesium sulphate is a neutral salt and cannot be used to neutralize acidity. It is suitable for soils with pH greater than 6. Mostly used for the preparation of mixed fertilizers, or with liquid fertilizer foliar spray. 2. Dolomite is a double salt composed of magnesium carbonate and calcium carbonate, containing 21.7% magnesium oxide and 30.4% calcium oxide. Mostly used to neutralize soil acidity and improve soil. Used to formulate compost. 3. Ammonium magnesium phosphate is a long-acting compound fertilizer. Besides containing magnesium, it also contains 8% of nitrogen, 40% of phosphorus, and is slightly soluble in water, and all contained nutrients are effective. Application Technology: It should be applied together with other fertilizers and can be used as base fertilizer, top dressing and foliar fertilizer. Dolomite, which is slightly soluble in water, is suitable for shallow application of basal fertilizers on acidic soils. In terms of magnesium, it is generally applied to 1-1.5 kg per 667 square meters. Magnesium oxide or magnesium sulfate is preferably applied on alkaline soil. For topdressing, it should be applied early, with 1% - 3% magnesium sulfate or 1% magnesium nitrate, about 50kg per 667 square meters of spray fertilizer solution, spray several times, magnesium nitrate spraying effect is better than magnesium sulfate. IV. Precautions The fertilizer effect of magnesium fertilizer depends on the soil, crop species, and application methods. Magnesium fertilizers are mainly applied to magnesium-deficient soils and vegetable crops that require more magnesium. For example, in the sandy soil, swampy soil, acidic soil, highly leaching soil, the fertilizer effect is better; the fertilizer effect applied on the leguminous crops is good. Under conditions of large-scale application of potash fertilizer, calcium fertilizer, and ammonium nitrogen fertilizer, magnesium deficiency can easily be caused in crops, so magnesium fertilizer should be used in conjunction with application. Water-soluble magnesium fertilizer should be used as top dressing, and slightly water-soluble magnesium fertilizer should be used as base fertilizer.
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