GB/T 21985-2008 English PDF

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GB/T 21985-2008: Temperature index of high temperature harm for main crops
Status: Valid

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GB/T 21985-2008	169	Add to Cart	3 days	Temperature index of high temperature harm for main crops	Valid

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Basic data

Standard ID: GB/T 21985-2008 (GB/T21985-2008)
Description (Translated English): Temperature index of high temperature harm for main crops
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A47
Classification of International Standard: 07.060
Word Count Estimation: 7,785
Date of Issue: 2008-06-03
Date of Implementation: 2008-11-01
Quoted Standard: QX/T 50-2007
Regulation (derived from): Announcement of Newly Approved National Standards No. 9, 2008 (No. 122 overall)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the rice, wheat, corn, cotton, canola hazards by high temperature indicators. This standard applies to agro-meteorological monitoring side of the terminator, early warning, assessment, agricultural production, scientific research, and other related fields.

GB/T 21985-2008: Temperature index of high temperature harm for main crops

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Temperature index of high temperature harm for main crops ICS 07.060 A47 National Standards of People's Republic of China The main crops of high temperature hazards temperature index Posted 2008-06-03 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

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.

Introduction

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

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

4.1 Rice 4.1.1 Early Rice Seedlings of film. TMax≥26 ℃, the film seedlings suffer. - Heading. for three consecutive days TMax≥35 ℃ or T≥30 ℃, the pollen development affected flowering and poor pollination and fertilization. Filling Stage. TMax≥35 ℃ or T≥30 ℃, the Filling shortened, early maturity, yield and quality. 4.1.2 Middle Rice (including late season) Seedlings of film. TMax≥26 ℃, the film seedlings suffer. Booting stage to heading stage. three consecutive days TMax≥35 ℃ or T≥30 ℃, the pollen development affected flowering and poor pollination and fertilization. Filling Stage. T≥28 ℃, the Filling shortened, early maturity, grain weight decreased to increase the rate of blighted valley, Production, and quality. 4.1.3 Late Seedling period. TMax≥35 ℃ or T≥30 ℃, the seedling quality is poor. ......

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