GB/T 34809-2017 in English
VALIDDrought grade of sugarcane
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
| Standard No: | GB/T 34809-2017 |
| Document status: | VALID |
| Title in English: | Drought grade of sugarcane |
| Title in Chinese: | 甘蔗干旱灾害等级 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-11-01 |
| Implemented on: | 2018-05-01 |
| ICS Classification: | 07.060-Geology. Meteorology. Hydrology |
| Chinese Classification: | B18-Agricultural meteorology |
| Professional Classification: | GB-National Standard |
| Related Keywords: | sugarcane drought disaster grade standards grade type relative soil moisture index
drought grade sugarcane morphological index light drought soil drought dry soil layer thicknessseedling emergence rate≥60 % moderate drought |
| Related Topics: | disaster
Drought Disaster Grade Standard Drought disaster level Disaster level global disaster drought disaster two disasters all of sugar cane GBT34809 GB/T 34809-2017 dry cane Flood and Drought Disaster Database Sugar cane procurement |
《GB/T 34809-2017甘蔗干旱灾害等级》由TC539（全国农业气象标准化技术委员会）归口，主管部门为中国气象局。
Introduction
Interpretation of Sugarcane Drought Disaster Grade Standards
| Grade Type | Relative Soil Moisture Index (Rsm) | Water Deficit Anomaly Index (CWDIa) | Sugarcane Morphological Index |
|---|---|---|---|
| Light Drought | 60≤Rsm<65 | 30≤CWDIa<45 (Stem Elongation Period) 35≤CWDIa<50 (Other Development Periods) | Dry Soil Layer Thickness<3cm Seedling Emergence Rate≥60% |
| Moderate Drought | 55≤Rsm<60 | 45≤CWDIa<60 (Stem elongation period) 50≤CWDIa<65 (Other developmental stages) | Dry soil thickness ≥3cm and <6cm Seedling rate ≥40% |
| Severe drought | 45≤Rsm<55 | 60≤CWDIa<75 (Stem elongation period) 65≤CWDIa<80 (Other developmental stages) | Dry soil thickness ≥6cm and <12cm Seedling rate ≥30% |
| Extreme drought | Rsm<45 | CWDIa≥75 (stem elongation period) CWDIa≥80 (other development periods) | Dry soil thickness≥12cm Seedling rate<30% |
Explanation of professional terms and practical applications
Relative soil moisture index (Rsm): An important indicator for measuring soil drought, reflecting the ability of sugarcane roots to obtain water from the soil. 30cm soil layer is used for calculation in the seedling stage and stem elongation period, and 50cm soil layer is used in other stages.
Water deficit anomaly index (CWDIa): A drought indicator used to eliminate regional and seasonal differences, taking into account precipitation, evaporation and crop water demand. Its calculation formula is based on 30-day cumulative data, and the weight coefficient can be adjusted according to regional characteristics.
Sugarcane morphological indicators: Including dry soil thickness, seedling emergence rate and leaf status, it directly reflects the impact of drought on sugarcane growth. For example, in the mild drought stage, the upper part of the leaves roll up during the day but can recover at night; in the severe drought stage, seedlings may die.
Background of standard formulation and technological evolution
This standard is managed by the National Agricultural Meteorological Standardization Technical Committee, and the main drafting units include the Guangxi Zhuang Autonomous Region Meteorological Disaster Reduction Institute and the Academy of Agricultural Sciences. The background of its formulation is based on the fact that sugarcane producing areas have been affected by drought disasters for a long time, and a unified monitoring and evaluation system needs to be established.
In terms of technological evolution, the standard combines traditional agricultural meteorological methods with modern remote sensing technology (such as EOS/MODIS data), and verifies the applicability of indicators through a large number of field tests. In the future, the regional setting of the crop coefficient kc can be further optimized.
Implementation Suggestions
- Give priority to the use of the Rsm indicator for drought monitoring, especially in areas with soil moisture observation conditions.
- In the case of insufficient data, the CWDIa or sugarcane morphology index can be used as a supplement.
- Strengthen the experimental research on the regional crop coefficient kc to improve the accuracy of drought monitoring.
- Combining meteorological forecasts with agricultural insurance mechanisms, formulate emergency plans based on drought levels.
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
GB/T 45975-2025 in English
Data format of terrestrial ecological meteorological application
2025-08-01 -
GB/T 34965-2017 in English
Grade of chilling injury to capsicum
2017-12-29 -
GB/T 42960-2023 in English
Calculation method of meteorological factors in delimitation and evaluation of ecological conservation redline
2023-08-06
