What are the varieties of magnesium fertilizer and how to apply it?

Commonly used magnesium fertilizers are magnesium sulfate.

Magnesium chloride, magnesite, dolomite.

Calcium, magnesium, phosphate fertilizer, etc. In addition, organic fertilizers also contain a certain amount of magnesium. The main properties of commonly used magnesium fertilizers are listed in Table 18.

Table 18 Main properties of commonly used magnesium-containing fertilizers.

Note: MGO (%) = mg (%)

The application of magnesium fertilizer can be divided into basal fertilizer and top dressing. Basal fertilizer, 667 m2 with magnesium sulfate (mgSO4

7h2o) 10 15 kg, about equivalent to Shi mgo kg. Fertilizer should be applied shallowly to facilitate crop absorption. If applied on acidic soil, dolomite powder should be used, which can not only supply magnesium and calcium, but also reduce soil acidity; Top dressing, usually sprayed with 1% 2% magnesium sulfate solution, sprayed every 7 days, 2 3 times in a row, such as soil application in the citrus fruit stage, usually per plant hole applied kilograms.

In order to improve the application effect of magnesium fertilizer, two points should be emphasized: Strictly control the dosage. Excessive use of magnesium fertilizer can cause an imbalance in the ratio of magnesium to other nutrients.

For example, rubber, although it is a crop that requires more magnesium, excessive magnesium application will cause difficulty in debinding and reduce yield; Magnesium fertilizer varieties are selected for soil. Different magnesium fertilizer varieties have different effects on soil acidity and alkalinity, and magnesium sulfate and magnesium chloride should be used for soil close to neutral or slightly alkaline. Acidic soil should be magnesite, dolomite powder, limestone powder, potassium magnesium fertilizer, calcium magnesium phosphate fertilizer, etc.

Magnesium-containing fertilizers include magnesium sulfate, magnesium alum, Epsom salt, magnesium chloride, magnesium nitrate, magnesium oxide, calcium magnesium phosphate fertilizer, etc. Plots with light soil, acidic soil, high leaching soil and a large amount of phosphorus fertilizer are prone to magnesium deficiency. The amount of magnesium fertilizer applied varies according to the soil and crops, and generally 15 to 25 kg of pure magnesium per hectare.

Magnesium sulfate and magnesium nitrate can be sprayed on the foliar surface, and the concentration of spraying on vegetables is magnesium sulfate and magnesium nitrate is.

Commonly used magnesium-containing fertilizers mainly include magnesium sulfate, magnesium chloride, magnesium nitrate, magnesium oxide, potassium magnesium fertilizer and other water-soluble magnesium fertilizers, which are soluble in water and easy to be absorbed and utilized by crops. Calcium magnesium phosphate fertilizer, magnesium ammonium phosphate, dolomite and other fertilizers also contain magnesium, which is slightly water-soluble or insoluble in water, and the fertilizer effect is slow, and it is suitable for acidic soil.

Magnesium fertilizer is a fertilizer with an indicated amount of magnesium (mg). Soil application can increase the magnesium supply capacity of the soil.

Magnesium is one of the main components of chlorophyll in plants and is involved in photosynthesis in plants. Magnesium is also the activator of the carboxylase of the silver finch's diphosphate, which can promote the assimilation of carbon dioxide in plants. Magnesium ion Bifiber can stimulate the activities of glucokinase, fructokinase and phosphoglucotransotype enzyme related to carbohydrate metabolism; It is also an activator of DNA polymerase, which can promote DNA synthesis.

In addition, magnesium is also involved in fat metabolism, which can promote the conversion of acetic acid to acetyl-CoA, thereby accelerating the synthesis of fatty acids. Magnesium deficiency in plants hinders metabolism in vivo, which has a great impact on the development of young tissues and the maturation of seeds.

<>1. Magnesium fertilizers include magnesium sulfate, magnesium chloride, magnesite, dolomite, calcium, magnesium and phosphate fertilizers. 2. The magnesium supply affects the photosynthesis of plants. 3. Pectin contains magnesium, which can maintain the normal structure and stability of cells.

4. Magnesium can promote phosphorus assimilation, and can be used as an activator for dozens of magnesium to promote glycolysis, tricarboxylic acid cycle and ATP synthesis. 5. Divalent magnesium ions can activate diphospholipid ribulose acid double kinase.

1. What are the magnesium fertilizers?

1. What are the magnesium fertilizers?

Magnesium sulfate, magnesium chloride, magnesite, dolomite, calcium, magnesium phosphate fertilizer, etc.

2. How to use magnesium fertilizer.

1) Magnesium fertilizer can be used for basal fertilizer, top dressing or foliar spraying.

2) When making base fertilizer, it is necessary to mix it with other chemical fertilizers or organic fertilizers before cultivating the land, or sprinkle it separately after mixing fine soil.

3) When doing top dressing, the time of application should be early, and the appropriate amount of magnesium sulfate per mu to apply magnesium fertilizer to the soil can be 10-13 kg, and the conversion of pure magnesium is kilogram per mu. After one application, it needs to be applied again every few crops, and it is not necessary to apply every crop.

4) Magnesium fertilizer can be sprayed foliar in the early and middle stages of crop growth, different crops or different periods of the same crop need different concentrations of magnesium fertilizer, fruit trees, vegetables, field crops such as rice, cotton, corn, spraying amount of 50-150 kg per mu.

Second, what is the effect on plants?

1. Magnesium is present in the center of the porphyrin ring of the chlorophyll molecular structure. The molecular mass of chlorophyll is magnesium, so the magnesium supply status is closely related to the photosynthesis of plants.

2. The magnesium content in phytochemicals reaches. Pectin also contains magnesium, which plays an important role in maintaining the normal structure of cells and their stability.

3. Magnesium can be used as an activator for multiple enzymes in Xu Sui, which can promote the assimilation of phosphorus. There are about dozens of enzymes that can be activated by magnesium, and almost all phosphorylases, kinases, certain dehydrogenases, and enolases require magnesium activation. Therefore, magnesium can promote glycolysis, tricarboxylic acid cycle and ATP synthesis, and achieve the role of regulating respiration, energy and metabolism of other substances.

4. Divalent magnesium ions can participate in the synthesis of carbohydrates, and it can activate diphospholipid ribulose acid double kinase.

5. The application of magnesium fertilizer to oil crops such as soybean can increase the amount of oil in seeds. Magnesium activates glutamine synthetase and promotes the synthesis of glutamic acid and glutamine.

6. Magnesium also plays a certain role in the activation, transfer and synthesis of amino acids into peptides.

7. Magnesium is also a component of ribosomes, which can stabilize nuclear protein particles.

Magnesium ammonium phosphate is a new type of long-acting slow-release fertilizer, containing 5% slow-release ammonium nitrogen, 25% slow-release phosphorus, and 10% slow-release magnesium. In the past two years, industry experts have continued to track the pilot and test of magnesium ammonium phosphate on different crops, and generally believe that magnesium ammonium phosphate can effectively control nitrogen and magnesium supplementation, improve crop quality, and its nutrient release period is long, which can reduce the number of fertilization, which is conducive to improving fertilizer utilization rate, alleviating soil acidification and salinization, and saving phosphorus resources.

Product features: magnesium ammonium phosphate, produced in nature on the islands of Peru and California, formed by a large number of guano and marine animal carcasses, up to 1,000 years, it is rich in phosphorus, nitrogen, magnesium and other nutrients, belongs to the slow-release fertilizer, has a long validity period, high utilization rate and other characteristics.

At present, a large number of water-soluble fertilizers are low in utilization, loss, leaching and serious environmental pollution environment, this fertilizer can be called a new revolution.

The role of magnesium ammonium phosphate in wastewater treatment is to add disodium hydrogen phosphate to the wastewater containing ammonia nitrogen and react with magnesium chloride to form an insoluble magnesium ammonium phosphate precipitate, thereby removing ammonia nitrogen in wastewater. Compared to the traditional activated sludge method, this method can reduce the sludge volume by 49%. Magnesium ammonium phosphate is not only widely used in chemical, pharmaceutical, construction and other fields, but also is a high-efficiency slow-release fertilizer.

Through the slow release of nutrients, the nitrogen and phosphorus in the fertilizer can be greatly reduced from entering nearby water bodies and prevent eutrophication.

Application in wastewater treatment:

If the water in the area where the wastewater treatment plant is located is of high water hardness, the effluent in that area usually contains high amounts of magnesium ions. When magnesium salts are not sufficient in wastewater, other magnesium salts can be added. If the wastewater treatment facility is located near the sea, using seawater or salt milk as a magnesium source is an economical and easy method.

Magnesium chloride can remove tannery wastewater that contains a lot of ammonia nitrogen. Magnesium oxide is widely used because of its small environmental impact, low solubility and strong alkalinity. The anaerobic digest of the stuffy limb of pig farm wastewater usually does not require the addition of magnesium salts.

The magnesium in the digest is sufficient to precipitate with ammonia nitrogen and orthophosphate.

In general, nitrogen-containing compounds in municipal domestic sewage produce large amounts of ammonia nitrogen during the spoilage process. Some chemical tanning wastewater and aging landfill leachate will contain high concentrations of ammonia nitrogen, which is often too high compared to magnesium, phosphorus and ammonia nitrogen in wastewater. Phosphorus, orthophosphate, polyphosphate and organophosphorus in sewage are dissolved in water.

The magnesium ammonium phosphate precipitation method has a good treatment effect on high-concentration ammonia nitrogen wastewater. The addition of magnesium salts and phosphates to wastewater with high concentrations of ammonia nitrogen can quickly remove ammonia nitrogen from wastewater.

The magnesium ammonium phosphate method has a high removal rate and fast reaction speed, and it can also be used to remove magnesium ammonium phosphate. In practice, it is also necessary to further optimize the reactant ratio and economically adjust the pH value to achieve stable operation and high product rate.

Magnesium fertilizer is also a kind of nutrient fertilizer that plants lack, and it is also of great help to the growth of plants, if we use magnesium fertilizer correctly, it can bring a great increase in yield to our crops, so what is the role of magnesium fertilizer and how to use it? What are the precautions for use? Let's take a look.

The role of magnesium fertilizerMagnesium is an essential nutrient element for crops, a component of chlorophyll, which can promote photosynthesis; It is an activator of many enzymes, which can promote the synthesis of various substances, such as vitamin A, vitamin C, etc., thereby improving the quality of fruits and vegetables; It 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 nitrogen, phosphorus, potassium and other chemical fertilizers, the crop yield continues to increase, the magnesium consumption in the soil is more, the supplement is less, and the phenomenon of crop magnesium deficiency has appeared in various places.

According to relevant information, about 54% of the country's soil needs to be supplemented with magnesium fertilizer to varying degrees.

How to use magnesium fertilizer (1) Soil application.

Magnesium can be used for basal fertilisers, top dressing, or foliar sprays.

To make base fertilizer, it should be mixed with other chemical fertilizers or organic fertilizers before ploughing or mixed with fine soil and sprinkled separately.

To do top dressing, apply early, use furrow application or flush application with water.

The appropriate amount of magnesium sulfate per mu for applying magnesium fertilizer to the soil is 10-13 kg, and the equivalent of pure magnesium is kg per mu; After one application, it can be applied again every few crops, and it is not necessary to apply every crop.

2) Foliar sprays.

Foliar sprays are applied in the early and middle stages of crop growth.

Different crops and different growth periods of the same crop require different concentrations of spraying, spraying with magnesium sulfate aqueous solution should be mastered in total, fruit trees, vegetables, field crops such as rice, cotton, corn, per mu with magnesium fertilizer spraying amount of 50-150 kg.

Precautions for the use of magnesium fertilizer 1Consider the available magnesium content of the soil.

There was a negative correlation between the availability of magnesium fertilizer on crops and the available magnesium content of soil.

When the available magnesium in the soil is less than 25 mg kg, the yield of magnesium on soybeans, peanuts, and Shanfeng tea is large.

When the soil has a tease of magnesium less than 50 mg kg, the application of magnesium fertilizer has different degrees of yield increase and increase.

2.Consider magnesium interactions.

The effect of magnesium application is limited by the application of potassium in soil.

After a large amount of potassium is applied to the soil, the magnesium supply of the soil is insufficient, and the potassium and magnesium in the soil have a mutual restriction effect, and the appropriate potassium-magnesium ratio is the basis for high yield and high efficiency.

After repeated field experiments, the more suitable potassium-magnesium ratio was 33 for sugarcane, 51 for cassava, 21 for peanut and soybean branches, 24 for jute and sweet potato, and 17 for watermelon.

3.Consider crop varieties and magnesium fertilizer needs.

The yield increase effect of magnesium fertilizer is related to the magnesium requirement and sensitivity of different crops.

Flue-cured tobacco was sensitive to magnesium, followed by rape and soybean, and wheat was less sensitive.

4.Choose the right magnesium fertilizer variety.

Different magnesium fertilizer varieties have different properties and different application effects.

The effect of applying magnesium carbonate, magnesium oxide and other chemical fertilizers on red soil increased the dry matter yield of crops; followed by magnesium sulfate and sepiolite powder, which increased the yield and respectively, and the magnesium chloride effect was poor.

Potassium sulfate fertilizer can reduce soil acidity and improve soil nutrients, and its use can be used as basal fertilizer, top dressing, seed fertilizer and extra-root locust fertilizer。1. Its role and use: 1. Potassium sulfate fertilizer can be slowly dissolved in the soil, and its chemical composition can improve the soil and make it more fertile, so as to provide a good environment for crops.

2. Supplemental nutrient potassium sulfate fertilizer contains potassium, zinc, boron and other elements, which can supplement nutrients to the soil and provide growth for plants. After the application of potassium sulfate fertilizer, the crop grows more vigorously and has a stronger fruiting ability. 3. As a base fertilizer, potassium sulfate fertilizer can be used as base fertilizer, pay attention to control the dosage, do not apply too much fertilizer, otherwise it is easy to lead to fertilizer damage, which is very harmful to crops, and the cost of subsequent soil improvement is relatively high.

4. The surface treatment of potassium sulfate can also be topdressed in the crop growth period. If used as seed fertilizer, the dosage per mu is kilograms, and it can also be prepared into a 2%-3% solution as topdressing outside the roots.

<> boron fertilizer is used as a base fertilizer for kilograms per mu, topdressing kilograms at the seedling stage, zinc fertilizer only needs to be 1 time a year, the amount of basal fertilizer is kilograms per mu, top dressing is kilograms, foliar fertilizer is 90-180 grams of zinc fertilizer mixed with 60 kilograms of water; Iron fertilizer is mixed with 1% iron fertilizer and thin cake fertilizer water mixed into the soil, or iron fertilizer is used as foliar fertilizer; Magnesium fertilizer is used as base fertilizer or top dressing kilograms per mu.

1. Dosage of boron-zinc-iron-magnesium fertilizer

1. Boron fertilizer: when the soil lacks boron, it can be used as basal fertilizer, generally applied kilograms per mu, and can be mixed with other organic fertilizers or chemical fertilizers.

2. Zinc fertilizer: as a base fertilizer, only need to be applied once a year, the amount per mu of base fertilizer is in kilograms, the amount should be determined according to the actual zinc deficiency of the soil, the amount per mu is in kilograms when topdressing, and when the foliar spray is carried out, the amount per mu is 90-180 grams of zinc fertilizer mixed with 60 kg of water and sprayed on sunny days.

3. Iron fertilizer: the commonly used iron fertilizer is iron sulfate, the main role is soil application and foliar spraying, mixed with 1% ferrous sulfate solution and thin cake fertilizer water, mixed into the soil, or used ferrous sulfate solution for foliar spraying, spraying time is suitable for windless morning or evening.

4. Magnesium fertilizer: magnesium fertilizer, that is, magnesium sulfate, when used as base fertilizer or top dressing, its dosage is kilograms per mu, when the crop is deficient in magnesium, the effect of topdressing outside the root is more obvious, and it can be sprayed several times, such as spraying 2% magnesium sulfate solution 3-5 times every 14 days when the fruit is formed, so the effect is more obvious.

2. The role of boron-zinc-iron-magnesium fertilizer in plants

1. Boron can promote the vegetative growth, reproductive growth and carbohydrate transport of plants, and can also enhance the stress resistance and bactericidal effect of crops.

2. Zinc is a necessary redox catalyst for plants, which can mainly promote cellular respiration and promote the formation of auxin.

3. Iron is an important element that plants can breathe, and it is one of the components of plant aerobic respiration, and the energy metabolism of plants needs to be completed.

4. The main role of magnesium is to promote the absorption of phosphorus, as well as to promote the photosynthesis of plants, and the application of magnesium fertilizer helps the production of chlorophyll in plant leaves.