Controlled release fertilizer is a type of controlled release fertilizer, which is an advanced form of slow-release fertilizer. It mainly controls the release rate of nutrients through coating technology, wrapping, or adding inhibitors to achieve safety, long-term effectiveness, and high efficiency. Controlled release fertilizers are the main direction of modern fertilizer development, particularly suitable for mechanized production and meeting the demand for simultaneous planting of fertilizers. The following is a detailed explanation of controlled-release fertilizers: definition and characteristics
Definition: Controlled release fertilizer is a fertilizer that can release nutrients according to a set release pattern (release rate and release time), and its release rate is consistent with the pattern of nutrient absorption by crops.
Characteristics: 1. High fertilizer efficiency: Conventional fertilizers suffer from severe nutrient loss, with less than 30% being truly utilized by crops. However, controlled-release fertilizers control nutrient release through coating, avoiding nutrient loss and achieving a fertilizer efficiency utilization rate of over 70%. For near root use, it can even reach over 80%. 2. Time and effort saving: Using controlled-release fertilizers can greatly reduce the frequency of fertilization and save manpower and material resources. Most crops can be fertilized only once a season and never need to be fertilized for life. 3. Significant yield increase effect: Controlled release fertilizer controls nutrient release, ensuring a stable and regular supply of nutrients to crops, avoiding fertilizer loss and overgrowth, thereby achieving significant yield increase. 4. Improving soil: After nutrient release, the empty shell can store water and retain moisture, playing a role in aeration and fertilization, improving soil structure, and making long-term compacted soil loose. 5. Sterilization and deworming: The coating material of controlled-release fertilizer uses polysulfide compounds, which have the effect of sterilization and deworming, reducing the use of pesticides. 6. Supplementing crop sulfur elements: After the release of controlled-release fertilizers, the broken shells can directly participate in nutrient release and be absorbed by crops, providing necessary sulfur elements for crops. working principle
The micropores on the membrane of controlled-release fertilizers are usually only a few hundred nanometers, and liquid water cannot directly pass through, only entering the membrane in the form of water molecules. Except for water molecules that can freely enter and exit the membrane, fertilizer particles are completely isolated from the outside. The release speed of nutrients is only related to the movement speed of water molecules and the pores of membrane micropores, and the movement speed of water molecules depends on temperature. This aligns the nutrient release curve of controlled-release fertilizers with the plant demand curve, achieving on-demand supply. Application advantages
Improve fertilizer utilization efficiency: reduce nutrient loss and waste, and enhance agricultural production efficiency.
Promoting crop growth: providing sustained and stable nutrient supply for crops, promoting their healthy growth.
Reduce environmental pollution: Reduce soil and water pollution caused by nutrient loss.
Strong adaptability: Controlled release fertilizers can adapt to different climatic conditions, soil types, and irrigation conditions, providing suitable nutrient environments for crops. matters needing attention
The price of controlled-release fertilizers is relatively high, but due to their significant fertilizer efficiency and various advantages, they are still widely used in agricultural production.
When using controlled-release fertilizers, reasonable fertilization should be carried out according to the growth needs of crops and soil conditions, avoiding excessive or insufficient fertilization.
When storing controlled-release fertilizers, attention should be paid to moisture, sun protection, and damage prevention to ensure their effectiveness and service life.
Controlled release fertilizer is an efficient, safe, and environmentally friendly fertilizer that is of great significance for improving agricultural production efficiency, promoting crop growth, and reducing environmental pollution.