What are the main raw materials for NPK fertilizer production?


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Hello, I am a salesperson from Tongli Heavy Industry. Today, I will introduce the trace elements contained in the raw materials of fertilizers produced by an NPK compound fertilizer production line. We will mainly discuss efficient NPK compound fertilizers, which usually contain nitrogen, phosphorus, and potassium as trace elements, and require the use of various raw materials during production.

Nitrogen sources in NPK compound fertilizers:

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Nitrogen is the most important component in the NPK fertilizer production line, as nitrogen plays a crucial role in plant growth and development. Common nitrogen sources include urea, ammonia, ammonium nitrate, and calcium nitrate, each with different properties and application ranges. For example, urea can lower the pH value of soil and improve acidic soil quality, while ammonium nitrate has a higher absorption and utilization rate in plants, promoting crop growth.

Phosphorus sources in NPK compound fertilizers:

Phosphorus is also an essential element in NPK fertilizers that promotes root growth, photosynthesis, cold and drought resistance, among other benefits. Common phosphorus sources include sodium tripolyphosphate, ammonium phosphate, and sodium hexametaphosphate, each with varying solubility and reaction rates, depending on crop and soil requirements.

Potassium sources in NPK compound fertilizers:

Potassium enhances photosynthesis, disease resistance, and yield and quality improvement. Potassium commonly appears in the form of salt compounds such as potassium chloride and potassium sulfate. The proportion of these potassium sources in fertilizers is typically low but is especially important for crops requiring high potassium content.

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Trace elements:

In addition to nitrogen, phosphorus, and potassium, trace elements are also necessary in the production process of compound fertilizers. Though plants require small quantities of these trace elements, their absence can affect crop growth. Zinc and copper, for instance, may cause yellowing during photosynthesis, making trace elements like boron, manganese, and molybdenum equally important.


In addition to nitrogen, phosphorus, and potassium, compound fertilizers require trace elements for optimal product quality. However, the quality of compound fertilizers is deeply influenced by raw material pre-processing, mixing ratios, and granulation machines. Specialized granulation equitment and other production equipment are necessary to control temperature, humidity, pH value, etc., ensuring that the product meets desired quality standards and can cater to different plant requirements.