The type and application of magnesium fertilizer

First, the nutritional role of magnesium Magnesium is an essential nutrient for crops, is a part 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. The quality of fruit and vegetables can promote the absorption of phosphorus and silicon by crops, increase the nutrient metabolism of phosphorus, and increase the disease resistance of crops. With the application of fertilizers such as nitrogen, phosphorus, and potassium, the yield of crops continues to increase, magnesium is consumed in the soil, and supplementation is small. The phenomenon of magnesium deficiency in crops has gradually appeared in various regions. According to the relevant information, about 54% of the soil in the country is required to supplement Mg fertilizer to varying degrees.

Second, the type of magnesium fertilizer According to its solubility can be divided into three categories, namely, water-soluble solid magnesium fertilizer and liquid magnesium fertilizer. The main types of water-soluble solid Mg fertilizers are sulphomagnesium sulphide, Epsom salt, anhydrous magnesium sulphate, potassium magnesium sulphate, potash magnesium sulphate, etc. Among them, Epsom salts and sulphomagnesium sulphides are the most widely used. The slightly soluble solid magnesium fertilizers mainly include magnesite, periclase, brucite, dolomite, magnesium ammonium phosphate, and serpentine, of which dolomite is the most widely used, while magnesite and light burned magnesium oxide also have application. Liquid magnesium fertilizer is essentially a water-soluble magnesium fertilizer and is used for soilless cultivation and foliar application. It is mainly an aqueous solution with different concentrations of Epsom salt and magnesium nitrate.

Third, the application of magnesium fertilizer

1, the principle of application:

(1) First used for soils that lack magnesium. When the effective magnesium content of the soil is 60-120 mg/l, it is a magnesium-deficient area; when the effective magnesium content of the soil is less than 60 mg/l, it is a time when magnesium is seriously deficient, magnesium fertilizer should be added in time. The effective magnesium content of soil is closely related to the nature of the soil and the environment in which it is located. It is generally believed that highly leached soils, acidic soils with pH < 6.5, low organic matter content, low cation exchange capacity, and poor soil fertility, are susceptible to magnesium deficiency. . In addition, due to unreasonable fertilization, long-term excessive application of nitrogen fertilizer, potassium fertilizer, calcium fertilizer in the soil, due to antagonism between ions and magnesium deficiency. The level of available magnesium in the soil in China is generally high in the north and low in the south, and magnesium-deficient soils are found in the south of 32 degrees north latitude.

(2) First used for crops that require more magnesium. Need more magnesium crops, one is the economic crops, if the tree, vegetables, cotton and leaf economic crops such as mulberry, tea, tobacco and so on. The second is the legume soybeans, peanuts and so on. (3) Magnesium fertilizers are selected based on soil pH. For neutral and alkaline soils, quick-acting physiological magnesium fertilizers such as magnesium sulfate should be used; for acid soils, slow-acting magnesium fertilizers such as dolomite and magnesium oxide should be used.

2. Application amount and application method:

(1) Soil application. Magnesium fertilizer can be used for base fertilizers, top dressings or foliar sprays. As a basal fertilizer, it must be sowed separately after mixing with other fertilizers or organic fertilizers and spreading fine soil. To apply fertilizer as early as possible, use furrows or dilute with water. Magnesium fertilizer applied to the soil for the appropriate amount of 10-13 kg of magnesium sulfate, 1 to 1.5 kg of pure magnesium for the acre; after a full application, can be applied again after several crops, do not have to apply every season crops.

(2) Foliar spraying. Foliar spraying is carried out in the early and middle crops. Different crops and the same crop must be sprayed at different fertility levels. The spray concentration of the aqueous solution of magnesium sulfate should be mastered. The fruit tree is 0.5%-1.0% and the vegetable is 0.2%-0.5%. Field crops such as rice , cotton, corn for the 0.3% -0.8%, the amount of magnesium fertilizer sprayed per mu is 50-150 kg.

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