QX/T 446-2018 in English
VALIDGrade of soybean drought
- Issued on:2018-09-20
- Implemented on:2019-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
| Standard No: | QX/T 446-2018 |
| Document status: | VALID |
| Title in English: | Grade of soybean drought |
| Title in Chinese: | 大豆干旱等级 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2018-09-20 |
| Implemented on: | 2019-02-01 |
| Professional Classification: | QX-Meteorology |
| Related Keywords: | drought grade classification system soil type growth stage no drought
standard soybean drought soybean drought introduction analysis light drought moderate drought |
| Related Topics: | super beans
drought Soybean v4 Series of soybeans soybean mon87705 big job Soybean Moisture Meter potato grading group of soybeans dried tofu Four grade soybean oil soybean market daidzein soybean market dried soybeans soybean quilt Grade 3 Soybean Oil Grade 1 Soybean Oil Three grade soybean oil soybean index Soybean oil grade 3 grade 1 Soybean grade 1 and grade 3 First grade soybean oil Soybean Moisture Meter Non-GMO Soy Grade 1 whole soy Soybean gb2715 Dried tofu low fat |
Introduction
Analysis of the core content of the standard
Drought grade classification system
| Soil type | Growth stage | No drought(mm) | Light drought(mm) | Moderate drought(mm) | Severe drought(mm) | Extreme drought(mm) |
|---|---|---|---|---|---|---|
| Sandy soil | Flowering-podding | ＞-2.5 | -10~-2.5 | -20~-10 | -30~-20 | ≤-30 |
| Grain filling stage | ＞-2.5 | -10~-2.5 | -20~-10 | -30~-20 | ≤-30 | |
| Loam | Blooming-pod setting | ＞-2.0 | -20~-2.0 | -30~-20 | -40~-30 | ≤-40 |
| Maturity period | -4.0 | -20~-4.0 | -35~-20 | -50~-35 | ≤-50 |
Key Technical Indicators
Calculation Formula for Water Deficit (Qd)
a：Texture parameter (55% sand, 65% loam, 70% clay)
Determination of Growth Retardation Humidity
- Typical scenario: When the field water holding capacity of loam in the black soil region of Northeast China is 28%, the growth retardation humidity is 18.2% (0.65×28)
- Measured case: When the measured humidity of the 30cm soil layer is 15%, the water deficit = -9.8mm (0.1×1.2×30×(15-18.2))
Key points for implementation of the standard
Operational procedures
- Determine soil texture (refer to the strip rubbing method in Appendix C)
- Measure soil moisture in each layer (drying method)
- Calculate water deficit by layer
- Accumulate key soil layer data by growth stage
Frequently asked questions
A: Continuous monitoring is required, and confirmation is made when the drought level is reached for five consecutive days.
Analysis of Standard Evolution
This standard inherits the framework of GB/T 32136-2015 "Agricultural Drought Levels". Innovations include:
- Establishing a soybean-specific drought indicator system for the first time
- Introducing dynamic thresholds for growth stages
- Adding parameters for determining clay soil types
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