QX/T 666-2023 in English

Observation technology system architecture

This standard constructs a two-layer observation system that includes parallel observation and point-to-surface combination, and ensures the representativeness and scientificity of the data by combining fixed observation points with regional surveys. The key technical indicators include:

Key technical innovations

1. Development period determination technology

Innovatively proposed "double threshold determination method":

• 10% of the plants show characteristics as the initial stage of development
• 50% of the plants meet the standards as the general stage of development
• For hidden development periods such as the needle-dropping stage, soil digging is required for verification

2. Yield prediction model

By establishing a ternary calculation model of number of pods per plant × 100-grain weight × kernel yield rate, the theoretical yield prediction error is controlled within ±5%. Among them:

 Theoretical yield (g/m²) = pod weight per plant (g) × plant density (plant/m²) Kernel rate = (kernel dry weight/pod dry weight) × 100% 

Typical cases of standard implementation

The application of Henan Meteorological Science Research Institute in Zhumadian Experimental Base shows that:

1. Through dynamic monitoring of leaf area index, the window period for topdressing can be accurately determined, and the use of chemical fertilizers can be reduced by 12%
2. Based on the correlation analysis between empty pod rate and meteorological elements, a drought early warning model is established
3. The standardized recording system improves data comparability by 40%

Meteorological disaster response specifications

The standard specifies the observation methods for 5 major disasters:

Implementation suggestions

1. Observation equipment configuration

• Required: electronic balance (0.01g), leaf area meter, soil moisture rapid tester
• Recommended: portable weather station, multi-spectral imager

2. Data quality control

Implement the "three-review system": observer self-review → technical person in charge review → business supervisor final review, to ensure:

• Development period determination error ≤ 3 days
• Yield analysis error ≤ 2%

3. Standard connection application

It is recommended to use it in conjunction with QX/T 299-2015 "General Principles of Agricultural Meteorological Observation Specifications" to form a complete observation system.