Magnesium, as an essential element for plants, plays an important role in plant metabolism and growth. When plants are deficient in magnesium, the prominent manifestation is a decrease in chlorophyll content and chlorosis. So, what kind of fertilizer is magnesium fertilizer? What are the magnesium fertilizers? What are the functions and effects of magnesium fertilizer? Let's take a look together below.
What kind of fertilizer is magnesium fertilizer?
Magnesium is mainly found in chlorophyll, phytochemicals and pectin, which plays an important role in photosynthesis. Magnesium ion is the activator of many enzymes, promotes the conversion and metabolism of carbohydrates in the body, and promotes the synthesis of fat and protein. Application of magnesium to oil crops can increase their oil content, and magnesium can also promote the absorption of silicon by crops.
What are the magnesium fertilizers?
Commonly used magnesium fertilizers include magnesium sulfate, magnesium chloride, magnesite, dolomite, and magnesia phosphate fertilizer. In addition, organic fertilizers also contain a certain amount of magnesium. The application of magnesium fertilizer can be divided into base fertilizer and top dressing.
(1) Base fertilizer, use 10-15 kg of magnesium sulfate (Mgo4.7H20) per 667 meters, which is approximately equivalent to 1.6-24 kg of Mgo. Fertilizer should be applied shallowly to facilitate crop absorption. If applied on acid soil, dolomite powder should be used, which can not only supply magnesium and calcium, but also reduce soil acidity;
(2) Top dressing, usually sprayed with 1%~2% magnesium sulfate solution, sprayed once every 7 days for 2~3 times in succession, such as applying in the soil during the fruiting period of oranges, usually 0.2~0.3 kg per plant hole . In order to improve the application effect of magnesium fertilizer, two points should be paid attention to:
①Strictly control the dosage. Excessive application of magnesium fertilizer will cause an imbalance in the ratio of magnesium to other nutrients. Such as rubber, although it is a crop that requires a lot of magnesium, excessive application of magnesium will cause difficulty in degumming and reduce production;
② Select magnesium fertilizer varieties due to soil. Different magnesium fertilizers have different effects on soil acidity and alkalinity. Magnesium sulfate and magnesium chloride should be used for soils close to neutral or slightly alkaline; magnesite, dolomite powder, limestone powder, potassium magnesium fertilizer, calcium magnesium phosphate fertilizer, etc. should be used for acid soils. .
The role and efficacy of magnesium fertilizer.
The role and efficacy of magnesium fertilizer are mainly reflected in three aspects. One is to promote better synthesis of chlorophyll. Only after magnesium atoms are combined with chlorophyll molecules can they have the necessary structure to absorb light quantum. The second is to promote protein synthesis, and magnesium is necessary for polysomes. The third is the activation of enzymes. In terms of activating phosphokinase, magnesium is more effective than other ions.