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Second, the type of magnesium fertilizer Magnesium fertilizer can be roughly divided into three categories according to its solubility, namely water-soluble solid magnesium fertilizer and liquid magnesium fertilizer. The water-soluble solid magnesium fertilizers mainly include sulphur magnesium strontium, espion salt, anhydrous magnesium sulfate, potassium magnesium sulfate, potassium magnesium strontium, etc., among which ethidium salt and sulphur magnesium sulphate are the most widely used. The slightly soluble solid magnesium fertilizers mainly include magnesite, periclase, brucite, dolomite, ammonium ammonium phosphate, serpentine, etc. Among them, dolomite is the most widely used, and magnesite and light burned magnesia also have application. Liquid magnesium fertilizer is essentially water-soluble magnesium fertilizer. It is used in soilless cultivation and foliar fertilization. It is mainly an aqueous solution of different concentrations of ethidium salt and magnesium nitrate.
Third, the application of magnesium fertilizer:
1, the principle of application: (1) first used in soils lacking magnesium. When the effective magnesium content of the soil is 60-120mg/l, it is the magnesium deficiency zone; when the effective magnesium content of the soil is less than 60mg/l, it is a serious lack of magnesium, and the magnesium fertilizer should be supplemented in time. The effective magnesium content of soil is closely related to the nature of the soil and the environment. It is generally considered that the soil with high leaching, acidic soil with ph<6.5, low organic matter content, low cation exchange capacity, and soil with poor fertilizer retention are prone to magnesium deficiency. . In addition, due to unreasonable fertilization, long-term excessive application of nitrogen, potassium, and calcium fertilizers may also cause magnesium deficiency due to antagonism between ions. The level of available magnesium in China's soil is generally high in the north and low in the south. It is a magnesium-deficient soil in the south of 32 degrees north latitude. (2) First used for crops that require more magnesium. Crops that require more magnesium, economic crops, and economic crops such as mulberry, tea, and tobacco for trees, vegetables, cotton, and leaves. The second is the legume crop soybeans, peanuts and so on. (3) Select magnesium fertilizer varieties according to soil pH. For neutral and alkaline soils, fast-acting physiological acid magnesium fertilizers such as magnesium sulfate should be used. For acidic soils, slow-acting magnesium fertilizers such as dolomite and magnesia should be used.
2. Application amount and application method: (1) Soil application. Magnesium fertilizer can be used for base fertilizer, top dressing or foliar spray. As a base fertilizer, it should be applied separately before or after mixing with other chemical fertilizers or organic fertilizers or mixed with fine soil. Do topdressing early, apply ditch or water. The optimum amount of magnesium fertilizer applied to the soil is 10-13 kg per mu of magnesium sulfate, and the pure magnesium is 1-1.5 kg per mu. After one application, it can be applied several times per crop, not every season. (2) Foliar application. Foliar application is carried out in the early and middle stages of crop growth. The concentration of spraying in different growth stages of different crops and the same crop is often different. The total concentration of spraying with magnesium sulfate should be mastered. The fruit trees are 0.5%-1.0%, the vegetables are 0.2%-0.5%, and the field crops such as rice. Cotton and corn are 0.3%-0.8%, and the spraying amount of magnesium fertilizer per acre is 50-150 kg.
First, the nutritional role of magnesium Magnesium is an essential nutrient element of crops, is a component of chlorophyll, can promote photosynthesis; is an activator of many enzymes, can promote the synthesis of various substances, such as vitamin a, vitamin c, etc., thereby improving The quality of fruits and vegetables; can promote the absorption of phosphorus and silicon by crops, enhance the nutrient metabolism of phosphorus, and improve the disease resistance of crops. With the application of chemical fertilizers such as nitrogen, phosphorus and potassium, the crop yield is continuously improved, the magnesium in the soil is consumed more, the supplement is less, and the phenomenon of magnesium deficiency in crops appears one after another. According to relevant information, about 54% of the soil in the country needs to be supplemented with magnesium fertilizer to varying degrees.
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