The differences in NPK blended fertilizer requirements for different crops mainly lie in three core dimensions: the ratio of nitrogen, phosphorus, and potassium; the types and amounts of micronutrients; and the fertilizer release characteristics.  Appropriate NPK blending machine and NPK blending fertilizer produciton line can precisely match the nutritional needs of different crops, enabling customized fertilizer production. Grain crops such as wheat and corn, with their long growing seasons and high energy demands for grain filling, have the highest demand for nitrogen. Phosphorus and potassium are important for promoting root development and strong stems.  A blended fertilizer formula with high nitrogen, medium phosphorus, and low potassium is usually selected. In some areas, silicon is also needed to enhance lodging resistance. The corresponding blending production line can use a precise batching system to mix nitrogen, phosphorus, potassium, and silicon fertilizers in the correct proportions, and efficient mixing equipment ensures uniform nutrient distribution. The differences are even more significant in cash crops such as fruits and vegetables. Leafy vegetables like cabbage and lettuce require high nitrogen levels to ensure thick and tender leaves, while phosphorus and potassium are only needed for basic growth. The small-batch blending function of the blending equipment can meet the customized fertilizer needs of these crops.  Fruiting crops such as tomatoes and watermelons require a balanced supply of nitrogen and phosphorus before fruiting, but after fruiting, the proportion of potassium needs to be significantly increased, along with calcium and magnesium to prevent fruit cracking and blossom end rot. The multi-bin batching module of the blending production line can add multiple micronutrients simultaneously, achieving a comprehensive and balanced nutrient mix.  For crops with lower fertilizer tolerance, such as legumes and potatoes, low-concentration formulas should be used and applied in multiple applications to avoid root and seedling burn. The graded discharge function of the blending production line can achieve mass production of fertilizers with different concentrations, meeting diverse planting needs.