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Experts: Let's talk about what is simple fertilizer. It refers to only one of the three nutrients of N, P, and K contained in a chemical fertilizer. For example, urea, superphosphate, or potassium sulfate, which are all simple fertilizers. Compound fertilizers are different. When a chemical fertilizer contains two or three kinds of N, P, and K nutrients, they are collectively referred to as compound fertilizers. Because the compound fertilizers are manufactured in different ways, they are not called same. Chemically synthesized binary fertilizers are often referred to as compound fertilizers such as diammonium phosphate, potassium dihydrogen phosphate, etc.; and ternary fertilizers configured by secondary processing using diammonium phosphate and potassium chloride or potassium sulfate as basic fertilizers. It is called compound fertilizer. Their nutrient content is expressed as a percentage of N, P205, and K20, as indicated on the fertilizer bag as 15-15-15, which is a ternary compound fertilizer with a N, P and K content of 15% each; 18-46- 0 means 18% nitrogen, 46% phosphorous diammonium, and no potassium in the fertilizer.
Reporter: Professor Chen, what are the advantages of compound fertilizer compared with single fertilizer?
Experts: The advantages of compound fertilizers include the following five aspects:
1. There are many types of nutrients contained, and the content of active ingredients is also high.
2. The granules are relatively solid, dust-free, uniform in size, small in moisture absorption, and convenient for storage and application.
3. Contains fewer accessory components and has virtually no effect on soil properties.
4. Low production costs, saving transportation costs and packaging materials.
5. Save on fertilizing labor.
Reporter: Compound fertilizer has many advantages. Is it disadvantageous?
Expert: Of course, it also has disadvantages, mainly:
1. The proportion of nutrients in compound fertilizers is relatively fixed and it is difficult to meet the different requirements for various types of soils and various crops.
2. The nutrients in the compound fertilizer, its location and release rate are difficult to fully meet the special requirements for nutrients in a certain period of the crop.
Reporter: Professor Chen, why do compound fertilizers are the current development direction of China's fertilizer industry?
Experts: Compound fertilizers have the advantages of diversification of nutrient ratios and product serialization, and thus have broad application prospects. At present, many manufacturers have begun production of special compound fertilizers, such as cotton fertilizer, watermelon special fertilizer. A compound fertilizer with a scientific formula will bring convenience and efficiency to farmers. Therefore, compound fertilizers are one of the directions for the development of China's fertilizer industry.
Reporter: What is the difference between the current situation of China's compound fertilizer development and foreign countries?
Experts: China's compound fertilizers started late and the development speed is not fast. At present, the total production of compound fertilizers only accounts for about 20% of the total amount of domestic fertilizers. In developed countries such as Japan, the United States, and Germany, the proportion of compound fertilizers is more than 70%, which is a big difference.
Expert Tips:
1. Compound fertilizers are relatively simple fertilizers. Due to the differences in the manufacturing methods of compound fertilizers, the name is not the same. The compound compound fertilizers that are generally chemically synthesized are called compound fertilizers; the compound compound fertilizers that are formulated on the basis of compound fertilizers are called compound fertilizers.
2. Compound fertilizers are one of the development directions of Chinese fertilizers. The compounding degree of chemical fertilizers in China is not high, and there is great potential for the development of compound fertilizers. Actively developing compound fertilizers is the need for sustainable agricultural development. Good use of compound fertilizers is a need for farmers to get rich through science and technology.
The advantages and disadvantages of compound fertilizers
Reporter: Professor Chen, why are some fertilizers called compound fertilizers, and some are also called compound fertilizers? What is the difference between them?