T/HJXNXH 001-2024 Active Group standards

T/HJXNXH 001-2024 Technical Specifications for the Production of Selenium-Enriched Litchi

T/HJXNXH 001-2024

Publish Date: 2024-12-20 Implement Date: 2024-12-30 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/HJXNXH 001-2024

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Terminology (principles and coordination and cooperation)

Publish Date: 2024-12-20

Implement Date: 2024-12-30

Scope

Main Technical Content: Selenium-enriched lychees are obtained through natural selenium enrichment during the growth process or through selenium bio-nutrition enhancement techniques, rather than adding selenium after harvest. These lychees are rich in the trace element selenium and meet the requirements specified in this document. 3.2 Selenium Bio-Nutrition Enhancement This refers to the technique of applying selenium-containing conditioners (or fertilizers) to enhance the selenium content in the edible parts of lychees through natural growth. 4 Site Selection and Planning 4.1 Site Selection 4.1.1 Climate Conditions The climate conditions should meet the following requirements: an average annual temperature of over 18°C, a minimum temperature of over 7°C in the coldest month, an extreme minimum temperature of over -2°C, and a frost-free period of no less than 350 days. The annual accumulated temperature should exceed 5,800°C, and the annual sunshine duration should be at least 1,100 hours. 4.1.2 Land Selection The production base should be located in areas along the Yangtze River and its tributaries, with an altitude below 300 m, a slope of less than 20°, convenient transportation, sufficient water resources, deep soil layers (about 1 m), and groundwater levels below 1 m. The soil should be loose, fertile (with an organic matter content of over 1.5%), and slightly acidic (pH value of 5.8–6.5). The slope should face south or southeast to avoid low-lying areas prone to frost damage. 4.1.3 Site Environment The site should be located in areas with good ecological environment and no pollution, far from industrial and mining areas and major highways and railways, and away from pollution sources. The air quality should meet the requirements of GB 3095. 4.2 Site Planning The site should be scientifically planned according to the local terrain, water, gardens, and roads, with the construction of necessary facilities such as roads (main roads, bra