What are the main characteristics and application methods of molybdenum fertilizer, silicon fertilizer and sulfur fertilizer?

With the development of modern precision agriculture, precision fertilization has developed rapidly and will become an important fertilization model. What are the main characteristics and application methods of molybdenum fertilizer, silicon fertilizer and sulfur fertilizer?

What are the main characteristics and application methods of molybdenum fertilizer?

1. Molybdenum is a kind of trace element which is less needed in the process of crop growth. It is closely related to nitrogen metabolism in plants. Molybdenum not only plays an important role in biological nitrogen fixation, but also participates in the reduction process of nitric acid, because molybdenum is the component of nitrate reductase.

2. When crops are short of molybdenum, if nitrate nitrogen is used as nitrogen source, nitrate ions will be accumulated in crops, thus reducing protein synthesis. In addition, the phosphatase activity of hydrolyzing various phospholipids is also affected by molybdenum, and the content of vitamin C in crops will be reduced when molybdenum is deficient. The main manifestations of molybdenum deficiency in crops are as follows: poor growth and development, short plants, loss of green leaves, wilt and necrosis.

3. Molybdenum fertilizer is suitable for all kinds of food crops and cash crops, especially leguminous crops, leguminous green manure and cruciferous crops.

4. At present, the commonly used molybdenum fertilizers are: ammonium molybdate [(NH4) 6Mo7O24 ·4H2O], which contains 54.3% molybdenum; sodium molybdate (Na2MoO4 ·2H2O), which contains 35.5% molybdenum, both of which are soluble in water. In addition, molybdenum trioxide (MoO3) and industrial waste residue containing molybdenum can also be used as molybdenum fertilizer. But ammonium molybdate is widely used.

Molybdenum fertilizer is generally used as base fertilizer, seed fertilizer and topdressing fertilizer, and the fertilizer effect can last for several years after being applied to the soil.

(1) as base fertilizer. Generally speaking, the industrial waste residue containing molybdenum is most suitable to be used as base fertilizer or seed fertilizer. Usually molybdenum fertilizer or molybdenum-containing industrial waste residue and ordinary calcium superphosphate are processed into molybdenum-containing calcium superphosphate. Because phosphorus and molybdenum can promote the absorption of crops, mixed application is beneficial to improve the fertilizer efficiency of molybdenum fertilizer.

(2) used for seed treatment. When dressing seeds, use 1g sodium molybdate per kilogram of seeds; when soaking seeds, soak seeds with 0.05%-0.1% ammonium molybdate solution for 12 hours.

(3) it can be used for extra-root topdressing of crops. 0.01%-0.1% ammonium molybdate solution is commonly used to spray crops. During the period from the seedling stage to the beginning of budding, molybdenum fertilizer can be sprayed twice.

5. Molybdenum fertilizer can also be added to major element fertilizer, but it can not be mixed with acid fertilizer, otherwise it will lead to the decrease of solubility. The seeds treated with molybdenum fertilizer can not be eaten by humans and animals, otherwise it will cause molybdenum poisoning.

What are the main characteristics and application methods of silicon fertilizer?

1. Silicon fertilizer is a kind of wolfberry soluble mineral fertilizer mainly containing calcium silicate, which is called by experts as the fourth largest element fertilizer after nitrogen fertilizer, phosphate fertilizer and potash fertilizer. Silicon fertilizer can not only provide all kinds of major and trace elements for crops and promote the growth and development of crops, but also CaO in silicon fertilizer can improve the growth environment of crops, and Ca2+ and Mg2+ ions can also promote the formation of stable aggregate structure in soil, which can obviously improve the fertilizer conservation capacity of soil.

2. A large number of calcium ions and silicate ions in silicon fertilizer can reduce the harm of heavy metal ions to crops, thus improving and improving the fruit quality of crops. At the same time, when silicon enters into crops, it can also silicify epidermal cells and play a role in insect prevention and disease resistance. In particular, crops such as rice, wheat, corn, peanuts, soybeans, watermelons, fruit trees and vegetables can generally increase production by 10% to 25% after applying silicon fertilizer.

3. At present, the production of silicon fertilizer in China is still very small, and the main varieties are only limited to calcium silicate. The appearance of the fertilizer is light gray powder, the proportion of SiO2 is about 25%, and the content of CaO is about 35%. In addition, it also contains a small amount of P2O5, K2O, MgO, ZnSO4, Fe2O3 and other substances.

4. The main methods of using silicon fertilizer are as follows: (1) Silicon fertilizer is most suitable to be used as base fertilizer. It can be applied alone or mixed with organic fertilizer. When applying, try to spread evenly, usually combined with cultivated land; (2) it can be used as topdressing, but pay attention to early application and deep application. The topdressing of paddy field should be spread in shallow water layer and ploughed deeply after application, while hole application or trenching application should be used in dry field, and the soil should be covered and watered after application.

5. When applying silicon fertilizer, we should pay attention to: (1) silicon fertilizer should not be used as seed fertilizer; (2) silicon fertilizer can not replace nitrogen fertilizer and potassium fertilizer; (3) the scientific combined application of nitrogen fertilizer, phosphate fertilizer, potash fertilizer, silicon fertilizer and other organic fertilizer should be carried out.

What are the main characteristics and application methods of sulfur fertilizer?

1. Sulfur, like nitrogen, phosphorus and potassium, is one of the essential nutrients of plants, and its demand is similar to that of phosphorus. Sulfur fertilizer is the constituent element of proteins and enzymes in plants. Sulfur fertilizer is the constituent element of proteins and enzymes in plants. If sulfur deficiency, it will affect protein synthesis, resulting in non-protein accumulation, the result will affect the normal growth and development of crops. At the same time, sulfur fertilizer is also a component of many enzymes, which are not only related to plant respiration, fat metabolism and nitrogen metabolism, but also have certain effects on starch synthesis. In addition, sulfur fertilizer is also a part of crop nitrogen fixation system, which is necessary for legume crops to fix nitrogen. It can be seen that sulfur fertilizer plays a very important role in the whole process of crop growth and development.

2. Sulfur fertilizer is suitable for all kinds of crops and soils, especially in alkaline soil, and has the function of improving soil. With the rapid development of agricultural production, the multiple cropping index of farmland is increasing, and the use of high concentration chemical fertilizer is more and more. The phenomenon of sulfur deficiency has appeared in most areas of our country, and it is becoming more and more serious. Therefore, the production and use of sulfur fertilizers have to be put on the agenda.

3. At present, there are many kinds of sulfur-containing fertilizers. In addition to sulfur gypsum used as sulfur fertilizer in production, other chemical fertilizers such as ammonium sulfate, potassium sulfate, ferrous sulfate and calcium superphosphate contain sulfate more or less. When these fertilizers are applied in sulfur-deficient soil, they can compensate for sulfur consumption to some extent.

4. The main component of gypsum fertilizer is calcium sulfate (CaSO4 ·2H2O), which contains about 18% sulfur and 23% CaO. The fertilizer is slightly soluble in water.

The main component of sulfur is elemental sulfur, which generally contains 60% and 80% sulfur. Elemental sulfur is not easy to be leached from the soil plough layer, so the aftereffect is longer.

5. The application method and amount of sulfur fertilizer (mainly gypsum and sulfur) vary with different soils and crops. Gypsum can be used as base fertilizer, topdressing or seed fertilizer. When making base fertilizer, gypsum should be crushed, evenly sprinkled on the surface of cultivated land, combined with cultivated land. When making topdressing, it can be applied in holes or strips, and the soil should be covered after application, with a dosage of 15kg to 30kg per mu. When it is used as seed fertilizer, the appropriate amount of fertilizer per mu is 4-5 kg.

6. Sulphur fertilizer can be used to touch the roots of rice seedlings, with a dosage of 2.5kg / mu. Among them, sulfur is generally used to touch the roots of rice. It should be noted that even if sulfur fertilizer is used to improve alkaline soil, the amount per mu should not be too much, and it is usually appropriate to control it at 1-4 kg.

Attention should be paid to the use of sulfur fertilizer: because the main component of sulfur fertilizer is sulfur, it must be applied with nitrogen fertilizer, phosphate fertilizer, potash fertilizer and other fertilizers.