Chemical Fertilizer

Nitrogen, phosphorus and potassium, the major nutrient elements in soil, can not meet the needs of crop growth, and need to be supplemented by fertilizers containing nitrogen, phosphorus and potassium. In addition to chlorine in soil, micronutrients need to be fertilized with micronutrients. Chemical fertilizers are generally inorganic compounds, only urea is organic compounds. Fertilizers that contain only one nutrient element that can be marked are called unit fertilizers, such as nitrogen, phosphorus and potassium fertilizers. Chemical fertilizers containing two or more of the three nutrient elements of nitrogen, phosphorus and potassium, which can indicate their content, are called compound fertilizers or mixed fertilizers. Grade is the main index of fertilizer quality. It refers to the percentage of available nutrient elements or their oxides in fertilizer products.