15-15-15 compound fertilizer is a balanced NPK compound fertilizer with 15% nitrogen, 15% phosphorus, and 15% potassium. Its precise ratio relies on the NPK fertilizer production line: nitrogen, phosphorus, and potassium raw materials are thoroughly mixed in a fertilizer mixer machine and then formed into granules by an NPK fertilizer granulator. This fertilizer has a wide range of applications and is a commonly used general-purpose fertilizer in agriculture.

Precise application matching is key. It is suitable for the entire growth period of most field crops, especially meeting the nutrient needs from the seedling stage to the tillering stage; it can also be used during the growth period of fruits and vegetables, balancing leaf and branch growth with flowering and fruiting. However, it should be noted that for crops that prefer nitrogen or potassium (such as leafy vegetables and potatoes), single-nutrient fertilizers should be supplemented according to the growth stage.

Scientific application methods fall into two categories: base fertilizer can be applied during land preparation before sowing/transplanting, at a rate of 25-35 kg per mu, spread and then plowed into the soil; topdressing should be done in stages, 10-15 kg per mu each time, applied in furrows or holes and covered with soil to prevent nutrient volatilization from surface application.

Key precautions: First, do not mix it with uncomposted organic fertilizers to prevent ammonia gas from burning the roots; second, avoid excessive application to prevent soil compaction and water eutrophication; third, irrigate promptly after application in paddy fields, and water moderately after application in dry land to promote dissolution; fourth, store away from humid environments to prevent caking, especially protecting the integrity of the finished granules to avoid damaging their stable structure formed by the NPK fertilizer granulator machine.

The core advantage of 15-15-15 compound fertilizer is its balanced and general-purpose nature. Scientific selection and application can fully utilize its fertilizer efficiency, meeting most planting needs and contributing to high-quality and high-yield crops.