GB/T 21985-2008Temperature index of high temperature harm for main crops (English PDF)

Foreword

The standard proposed by the China Meteorological Administration. The standard by the China Meteorological Administration Policy and Regulation Department. This standard by the Hubei Provincial Meteorological Bureau Wuhan Regional Climate Center is responsible for drafting, Plant Science and Technology, Huazhong Agricultural University, Wuhan meteorological Board participate. The main drafters of this standard. Feng Ming, Liu Anguo, WU Yi City, Hu Youlin, Zhang Fang Fang.

With global climate change, China's increase in extreme weather events, crop growing increasingly aggravated by the high temperature hazards. In order for farmers Disaster monitoring crop due to high temperatures and do harm, early warning and disaster assessment and disaster prevention and mitigation measures taken, this standard unified and standardized main agricultural Crop due to temperature index temperature hazards. The main crops of high temperature hazards temperature index

1 Scope

GB/T 21985-2008 is the Chinese national standard on temperature index of high temperature harm for main crops, in the field of natural and applied sciences. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 3 June 2008 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 November 2008. Classification: ICS 07.060, CCS A47. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This standard specifies the rice, wheat, corn, cotton, rapeseed by high temperature hazards temperature index. This standard applies to agricultural meteorological disaster monitoring, early warning, assessment, agricultural production, research and other related fields.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. QX/T 50-2007 surface weather observing practices - Part 6. air temperature and humidity observations

3 Terms, definitions and symbols QX/T 50-2007 established the following terms, definitions and symbols apply to this standard.

3.1 When the temperature rises to a certain extent, adversely affected crop growth, leading to stunted crop yield and quality were poor, Crop an organ or plant death.

3.2 Individual plant growth process, somatic cell mitosis proliferation on the basis of the time when the reproductive organs occurs in young bud Special cell division occurs.

3.3 Symbol TMax. daily maximum temperature. T. daily average temperature. H. air relative humidity.

4 high temperature hazard indicators