QX/T 411-2017 in English

Analysis of the core content of the standard

This standard innovatively establishes a quantitative evaluation system based on the meteorological conditions 15 days before harvest. Through the three core indicators of average temperature, relative humidity and sunshine hours, combined with the phenol-ammonia ratio (rRPA), objective grading of tea quality is achieved.

Technical details of the evaluation model

Empirical analysis of grade classification

Implementation and Application Suggestions

1. Optimization of Harvest Timing: It is recommended to harvest after meteorological indicators have reached the optimal range for three consecutive days.
2. Regional Adaptation: High-altitude production areas should pay special attention to the deduction of temperatures <10°C.
3. Disaster Prevention: Frost occurring 15 days before harvest will directly result in Itcq=0.

Background of Standard Evolution

Based on a follow-up study of 286 tea garden samples conducted by the Zhejiang Provincial Climate Center from 2014 to 2015, it was found that the influence of meteorological factors on tea quality follows the pattern of temperature (60%) > humidity (20%) ≈ sunshine (20%). This finding directly led to the establishment of this standard evaluation model.