The difference between Granular Urea and Prilled urea

Basic Knowledge of Urea: A "Star Product" in the Nitrogen Fertilizer Industry​

The chemical name of urea is carbamide, with the chemical formula CO(NH₂)₂. It has a nitrogen content as high as 46%, making it the solid nitrogen fertilizer with the highest nitrogen content. It is easily soluble in water. It is widely used in the cultivation of food crops, cash crops, and horticultural crops. Urea can not only quickly supplement the nitrogen required for plant growth, promote dark green leaves and robust plants, but also improve the photosynthesis efficiency of crops and enhance their stress resistance.​

Granular Urea VS Prilled Urea: A Comprehensive Interpretation of Differences​

(I) Fertilizer Effect Characteristics and Applicable Scenarios​

In terms of fertilizer effect release, due to its larger surface area, prilled urea has a larger contact area with the soil and water, so it dissolves quickly and releases the fertilizer effect rapidly. It can provide sufficient nitrogen for crops in a short time, and is especially suitable for use as topdressing. For example, during the rapid growth period of crops, such as the tillering stage of rice and the jointing stage of corn, prilled urea can meet the large demand for nitrogen in a timely manner and promote rapid crop growth.​

The dissolution rate of granular urea is relatively slow, and the fertilizer effect release is relatively stable and long - lasting. Its larger particles are not easy to be washed away with water in the soil, and can continuously provide nitrogen nutrition for crops, making it more suitable for use as base fertilizer. For example, when planting crops with a long growth period such as wheat and cotton, applying granular urea as base fertilizer can continuously provide nutrients for crops throughout the growth cycle, reducing the number of topdressing and labor costs.​

(II) Storage, Transportation and Application Methods​

During storage and transportation, due to their small particle size, prilled urea has a large bulk density and is prone to agglomeration during storage, especially in a humid environment. Therefore, when storing prilled urea, it is necessary to pay attention to moisture prevention and keep the storage environment dry and well - ventilated. In terms of transportation, prilled urea has good fluidity and is suitable for mechanical automatic loading, unloading, and conveying, but avoid severe vibration during the loading and unloading process to prevent particle breakage.​

Granular urea has relatively loose storage conditions due to its high hardness and low agglomeration tendency. Even in a humid environment, the agglomeration phenomenon is relatively mild. During transportation, granular urea has strong anti - breakage ability and is more suitable for long - distance transportation and long - term storage.​

In terms of application methods, due to their small particle size, prilled urea is suitable for various methods such as broadcasting, banding, hole - application, and can also be used for foliar spraying. However, when broadcasting, it is necessary to control the dosage and uniformity to avoid seedling burning caused by excessively high local fertilizer concentration. Due to its larger particle size, granular urea is more suitable for mechanical deep application. For example, using a seeding and fertilizing integrated machine to apply granular urea and seeds into the soil at the same time can not only improve fertilization efficiency but also reduce nitrogen volatilization loss and improve fertilizer utilization.​

How to Choose the Right Urea? Meeting Specific Needs is the Key​

The choice between granular urea and prilled urea needs to comprehensively consider factors such as crop type, planting method, soil conditions, and fertilization habits. If planting crops with a short growth period and urgent fertilizer requirements, such as leafy vegetables, prilled urea as topdressing can quickly meet the nitrogen demand of crops; for crops with a long growth period, high fertilizer requirements, and a preference for long - acting fertilization, such as fruit trees and perennial forages, granular urea as base fertilizer can give full play to its advantages.​

In addition, different soil textures will also affect the choice of urea. In sandy soils with poor water and fertilizer retention capacity, prilled urea dissolves quickly and is easily washed away with water. At this time, it is more appropriate to choose granular urea; in clay soils with strong water and fertilizer retention capacity, both types of urea can be selected according to actual needs.​

Conclusion​

Granular urea and prilled urea each have their own characteristics and advantages. There is no absolute superiority or inferiority, only the difference of suitability. Whether it is large - scale agricultural growers, agricultural materials dealers, or ordinary farmers, when choosing urea, they should fully understand the characteristics of the two types of urea, combine their own actual situations, and make scientific and reasonable choices, thereby improving fertilizer utilization, reducing production costs, and achieving sustainable agricultural development.