Is there anyone who can explain to me in detail what the definitions of chloro-based, thio-based, nitro-based, and phosphorus-based compound fertilizers are?

I just downloaded a paper; I can’t upload it, so I’m posting it here for everyone to take a look. 1. The components differ: sulfur-based compound fertilizers have a low chlorine content, **with a standard of less than 3%, and they contain large amounts of sulfur, which can effectively alleviate soil sulfur deficiency symptoms. In contrast, chlorine-based compound fertilizers contain high levels of chlorine, which can have adverse effects on certain crops. 2. Due to different production processes, the chloride content in potassium sulfate-based compound fertilizers is extremely low; chloride ions are removed during the production process ； K chloride-type compound fertilizers do not remove the chlorine element, which is harmful to chlorine-sensitive crops, during the production process; as a result, such products contain large amounts of chlorine. 3. Different application ranges: Chlorine-based compound fertilizers have an adverse effect on both the yield and quality of crops that are sensitive to chlorine, significantly reducing the economic benefits of such crops. In contrast, sulfur-based compound fertilizers are suitable for various types of soil and different crops; they can effectively improve the appearance and quality of these crops, thereby significantly enhancing the grade of agricultural products. 4. Chlorine-based compound fertilizers with different fertility levels leave behind large amounts of chloride ions in the soil, which can lead to problems such as soil compaction, salinization, and alkalization. These issues degrade the soil environment and reduce the ability of crops to absorb nutrients. In sulfur-based compound fertilizers, sulfur is the fourth most important nutrient element after nitrogen, phosphorus, and potassium; it can effectively alleviate sulfur deficiency and provide crops with sulfur nutrients directly. 5. Application methods: Different chlorinated compound fertilizers can be used as base fertilizers or topdresses; they are not suitable as seed fertilizers. When used as base fertilizers, they should be mixed with organic fertilizers, phosphate rock powder, etc. in neutral or acidic soils. When used as topdresses, they should be applied at an early stage. Sulfur-based compound fertilizers can be used as base fertilizers, topdresses, seed fertilizers, and foliar fertilizers.

Actually, you’ve understood it quite well. The chloro-based type refers to compound fertilizers produced from potassium chloride and ammonium chloride; it’s also known as dual-chloro-based fertilizers. Many fruit trees cannot use such fertilizers due to the risk of root damage. The sulfur-based type is a compound fertilizer made from potassium sulfate as its raw material. Removing the chloride ions from potassium chloride involves reacting sulfuric acid with potassium chloride to produce potassium sulfate, which is then used to create the compound fertilizer. The difference between the two lies in the fact that one contains sulfate ions while the other contains chloride ions. The production of sulfur-based fertilizers is more complex, but they are suitable for a wider range of crops. The nitro-based type is primarily used to produce compound fertilizers using nitric acid as the nitrogen source. Nowadays, production of ammonium-based fertilizers is restricted due to their explosiveness. Phosphorus compound fertilizers are fertilizers made from phosphate rocks; they are fertilizers that contain phosphorus, including phosphate-containing compound fertilizers, ordinary calcium phosphate, superphosphate, ammonium phosphate, and so on. Are there any further questions?

Nitro compound fertilizer is in contrast to urea-based compound fertilizer. In simple terms, the nitrogen source in nitro compound fertilizers is in the NO3 form, that is, nitrate nitrogen, as well as phosphorus and other elements ； Urea-based compound fertilizer uses urea as a nitrogen source, that is, urea nitrogen