GB/T 34763-2017 in English
VALIDUrea aldehyde slow release fertilizer
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 34763-2017脲醛缓释肥料》由TC105（全国肥料和土壤调理剂标准化技术委员会）归口，TC105SC5（全国肥料和土壤调理剂标准化技术委员会新型肥料分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Background and technical evolution of urea-formaldehyde slow-release fertilizer standards
Urea-formaldehyde slow-release fertilizer is an organic nitrogen fertilizer prepared by chemical reaction, which has the characteristics of slow-release nutrients and meets the needs of modern agriculture for environmental protection and efficient fertilization. The GB/T 34763-2017 standard fills the gap in this field in China and standardizes the terminology, quality requirements and testing methods.
Comparison of Standard Frameworks
| Standard Dimensions | GB/T 34763—2017 | International Standards |
|---|---|---|
| Terms and Definitions | Standardize terms such as urea-formaldehyde slow-release fertilizer and slow-release effective nitrogen | Consistent with ISO standards |
| Quality Requirements | Total nitrogen content ≥18%, particle size ≥90% | Conform to FAO recommended standards |
| Test Methods | Determination of urea nitrogen, hot water insoluble nitrogen, etc. | Optimize traditional testing processes |
Explanation of core terms of urea-formaldehyde slow-release fertilizers
Application of slow-release available nitrogen (SAN)
Slow-release available nitrogen is generated by the reaction of urea-formaldehyde, such as urea-formaldehyde (UF/MU) is calculated as hot water-soluble nitrogen, isobutylene diurea (IBDU) and butylene diurea (CDU) are calculated as cold water insoluble nitrogen. This term is used in fertilizer labels to clarify the source of nutrients and guide farmers to use them correctly.
The practical meaning of activity coefficient (AI)
The activity coefficient indicates the efficiency of converting cold water insoluble nitrogen into available nitrogen, and the calculation formula is: AI = (CWIN - HWIN) × 100% / CWIN. A high AI value indicates that the fertilizer has a good conversion effect in the soil and improves crop absorption rate.
Quality requirements for urea-formaldehyde slow-release fertilizers
- Total nitrogen content: ≥36.0% for urea-formaldehyde products, ≥28.0% for isobutylene diurea and butylene diurea
- Particle size: Granular, strip, flake or powder, particle size requirement ≥90% (1.00mm～4.75mm)
- Moisture content:≤3.0%, powdered product ≤5.0%
Testing methods for urea-formaldehyde slow-release fertilizers
Testing includes indicators such as total nitrogen, urea nitrogen, and hot water soluble nitrogen. For example, when determining cold water insoluble nitrogen, the undissolved nitrogen is CWIN after extraction in a phosphate buffer solution at 25°C and pH7.5 for 15 minutes.
Implementation suggestions for urea-formaldehyde slow-release fertilizers
- Production process:Strictly control the raw material ratio and reaction conditions to ensure product stability
- Testing process:Use standard methods to measure various indicators to ensure product quality
- Guidelines for use:Choose the appropriate type of fertilizer and apply a reasonable amount of fertilizer according to crop needs
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