Traditional chemical fertilizer production is similar to modern chemical fertilizer production.

1, there are many kinds of nutrient elements, the coordinated application of nitrogen, phosphorus and potassium is realized, and the fertilizer utilization rate is high. It can also be prepared into a series of special fertilizers according to the nutrient status of different types of soil and the fertilizer demand characteristics of crops, which has strong pertinence, remarkable fertilizer efficiency and high fertilizer utilization rate and economic benefit. It has certain compressive strength and particle size, good physical properties and convenient use. It contains a variety of nutrients, and reasonable application can promote the balance of soil nutrients. Farmers are used to applying more elemental fertilizers, especially a large amount of nitrogen fertilizers, and rarely applying potassium fertilizers. The application of organic fertilizers is getting less and less, which easily leads to the imbalance of soil nutrients. 2. Disadvantages: First, the contained nutrients are applied at the same time, and some nutrients may be inconsistent with the fertilizer demand period of crops, which is easy to be lost and difficult to meet the special requirements of crops for nutrients in a certain period. Second, it is difficult for compound fertilizer with fixed nutrient ratio to meet all kinds of soil and soil at the same time.