GB/T 27959-2011 Low temperature disasters for rice, rapeseed and citrus in the south GB/T27959-2011 Standard compression package decompression password: www.bzxz.net
This standard specifies the classification and level of low temperature disasters caused by rice, rapeseed and citrus in the south. This standard is applicable to the monitoring, forecasting, warning and release of low temperature disasters and their evaluation by relevant departments at all levels such as meteorology, agriculture, statistics, and civil affairs.
This standard was drafted in accordance with the rules given in GB/T1.1-2009.
This standard was proposed by the China Meteorological Administration.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Meteorological Disaster Prevention and Mitigation (SAC/TC345). This standard was
drafted by: Hunan Meteorological Science Institute, National Climate Center, and Regulations Department of Hunan Meteorological Administration.
The main drafters of this standard. Lu Kuidong, Huang Wanhua, Ye Dianxiu and Xie Junan.

ICS 07.060
Baojia Standard of the People's Republic of China
GB/T 27959--2011
Low temperature disaster of southern rice,rapeseed and orange2011-12-30 Issuedwww.bzxz.net
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2012-03-01 Implementation
This standard was drafted in accordance with the rules given in GB/T1.1-2009 and proposed by the China Meteorological Administration.
GB/T279592011
This standard is under the jurisdiction of the National Technical Committee for Standardization of Meteorological Disaster Prevention and Mitigation (SAC/TC345). The drafting units of this standard are: Hunan Meteorological Science Research Institute, National Climate Center, and Regulations Department of Hunan Meteorological Administration. The main drafters of this standard are: Lu Kuidong, Huang Wanhua, Ye Dianxiu, Xie Junan, I
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1 Scope
Low temperature disasters of rice, rapeseed and citrus in the south This standard specifies the classification and level of low temperature disasters caused by water frost, rapeseed and citrus withering in the south. GH/T 27959—2011
This standard is used for monitoring, forecasting, warning and issuing of low temperature disasters by meteorological, agricultural, statistical, civil affairs and other relevant departments at all levels and their evaluation. 2 Terms and definitions
The following terms and definitions apply to this document. 2.1
Air temperature
A physical quantity indicating the degree of coldness and heat of air.
Note that the temperature measured in ground meteorological observation is at a height of 1.50 above the ground. 2.2
Extreme minimum temperatureextremelyleasttemperatureThe lowest value of the temperature in a certain period of time.
Low temperature disaster lowtemperatureatnredisaster An agricultural meteorological disaster in which the temperature in a certain place is significantly lower than normal during a period of time, affecting the normal growth and development of crops. 2.4
Low temperature disaster types mainly include four types: chilling damage, freezing damage, frost and freezing damage. 2.5
Colding damage coldinjary
During the growing season of crops, the temperature at an important stage of the growth period is lower than the required temperature (but still above 0), causing the development period of crops to be delayed, or the physiological functions of reproductive organs to be damaged, resulting in a low temperature disaster with reduced agricultural production. 2.6
Cold billing injury
Tropical crops in South China are exposed to low temperatures below 10°C or above, which causes the plants to wilt, rot or become sick, and even die. This is actually a kind of cold injury.
3 Water hedgehog cold injury
3. For example, if the average temperature of the ten-day period from the sowing of the double-season early sowing to the early sowing is 2 or more lower than the annual average temperature of the ten-day period, and lower than the average temperature of the previous ten-day period, it is a late spring cold.
The late spring cold is divided into three levels:
1) Mild late spring cold: -2>4≥>3.5 and T(average value)
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