Types of Chemical Fertilizers There are 16 kinds of essential nutrients for crops, except that carbon dioxide and oxygen are absorbed from the air, and others need to be fertilized in different degrees to meet the normal growth needs of crops. According to the crop's demand for nutrients, it is divided into a large number of elemental fertilizers, including nitrogen fertilizers, phosphate fertilizers, and potassium fertilizers; medium-element element fertilizers including calcium, magnesium, and sulfur fertilizers; and trace element fertilizers including zinc, boron, manganese, molybdenum, iron, and copper. Fertilizer; In addition, there are some beneficial elements such as fertilizers such as silicon-containing materials, rare earth elements. At present, fertilizers marketed by the market are dominated by NPK fertilizers, and there are also many varieties of each fertilizer. The main nitrogen fertilizers are: urea, ammonium bicarbonate (ammonium carbonate), ammonium chloride, ammonium sulfate, ammonium nitrate, calcium nitrate, ammonia, lime nitrogen, etc. Also belong to nitrogen fertilizer, but it has been used less frequently. Calcium nitrate is both nitrogen fertilizer and calcium fertilizer. The main types of phosphate fertilizers are superphosphate (superphosphate), heavy superphosphate (heavy calcium, also known as double, triple calcium superphosphate), calcium magnesium phosphate, in addition, phosphate rock, steel slag phosphate, defluorinated phosphate fertilizer, bone meal is also Phosphorus fertilizer, but the current amount is very small, the market is also rare. The main potash fertilizers are potassium sulfate, potassium chloride, salt lake potash, kiln ash potash and grass ash. The components of potassium sulfate and potassium chloride are relatively pure. Most of the products circulated on the market in China are imported fertilizers. Potassium from salt lakes is produced in Qinghai Province of China. The main component is potassium, and the components of kiln-ash potash and tree-wood ash are very complex. The circulation volume in the market is higher than before. Three kinds of potassium are less. There are also many trace element fertilizer types, the most commonly used boron fertilizer is borax, zinc fertilizer is zinc sulfate, manganese fertilizer is manganese sulfate, molybdenum is ammonium molybdate, copper fertilizer is copper sulfate, and iron fertilizer is ferrous sulfate and some organics. Iron complexes With the deepening of agrochemical research, the use of compound fertilizers has become more widespread. Compound fertilizers are fertilizers containing two or more components of nitrogen, phosphorus, and potassium at the same time. They are divided into two categories according to their manufacturing methods: compound fertilizers and composts. The most common compound fertilizer is diammonium phosphate (ammonium phosphate), in addition to ammonium urea, ammonium phosphate, ammonium sulfate, nitrate phosphate, diammonium phosphate, and potassium nitrate. When using compound fertilizers, the ratio of nutrients needs to be adjusted to suit different crop and soil requirements.
Mixed fertilizer, which is made of several kinds of simple fertilizers according to crops and soil and other conditions flexibly formulated into different specifications, prepared by mechanical mixing method, the current market for the sale of special fertilizers are mostly such fertilizers. In addition, various liquid fertilizers and spray fertilizers promoted on the market today are also mixed with various nutrient elements such as fertilizers, amino acids, and other organic components, which also have certain effects on improving crop yield and quality.
Mixed fertilizer, which is made of several kinds of simple fertilizers according to crops and soil and other conditions flexibly formulated into different specifications, prepared by mechanical mixing method, the current market for the sale of special fertilizers are mostly such fertilizers. In addition, various liquid fertilizers and spray fertilizers promoted on the market today are also mixed with various nutrient elements such as fertilizers, amino acids, and other organic components, which also have certain effects on improving crop yield and quality.
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