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GB/T 34812-2017 English PDF

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GB/T 34812-2017: Meteorological grades of water-saving irrigation -- Cotton
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Basic data

Standard ID GB/T 34812-2017 (GB/T34812-2017)
Description (Translated English) Meteorological grades of water-saving irrigation -- Cotton
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard B18
Classification of International Standard 07.060
Word Count Estimation 10,148
Date of Issue 2017-11-01
Date of Implementation 2017-11-01
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

GB/T 34812-2017: Meteorological grades of water-saving irrigation -- Cotton

---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.
Meteorological grades of water-saving irrigation-Cotton ICS 07.060 B18 National Standards of People's Republic of China Crop water-saving irrigation weather grade cotton Posted.2017-11-01 2017-11-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Preface Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 levels and irrigation quota 2 Appendix A (Normative) Cotton moisture deficit calculation 3 References 7

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed by China Meteorological Administration. This standard by the National Agricultural Meteorology Standardization Technical Committee (SAC/TC539) centralized. This standard drafting unit. Chinese Academy of Meteorological Sciences, Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning, China Water conservancy Electric Science Institute. The main drafters of this standard.Huo Zhiguo, Xiao Jingjing, Li Maosong, Li Jusheng, Russia have Hao, Mao Fei, Wang Li, Zhang Lei, Yu Caixia, Wang Chunyan.

Introduction

For real-time, targeted cotton water-saving irrigation services to effectively alleviate the shortage of agricultural water resources, improve water use efficiency of farmland, the real Now crop water-saving and yield increase, based on different stages of cotton water demand and its water deficit rate, combined with the forecast of future precipitation levels, the preparation of this standard. Crop water-saving irrigation weather grade cotton

1 Scope

This standard specifies the classification of cotton water-saving irrigation meteorological levels and irrigation quota. This standard applies to forecast and service of cotton water-saving irrigation.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. Wheat drought disaster rating Technical guideline for determination of irrigation water utilization rate

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Crop water deficit waterdeficitincrop Crop water absorption can not meet the needs of transpiration, the body of water shortage, hindering the phenomenon of normal physiological activity. 3.2 Crop water deficit watershortageincrop When crop water deficit occurs, the difference between the water content and the crop water requirement of the soil layer with a certain depth in the root range of the crop within a certain period of time Amount, expressed in absolute terms. Note. The unit is millimeter (mm). 3.3 Crop water deficit rate waterdeficiencyratesincrop Within a certain period of time, the ratio of crop water deficit to crop water demand, referred to as the water deficit rate. Note. Expressed as a percentage. 3.4 Crop water-saving irrigation water-savingirrigationforcrop According to different stages of crop water demand and its water deficit situation, to maximize the amount of irrigation water per unit for Appropriate amount of output and output value, appropriate irrigation. 3.5 Crop water-saving irrigation meteorological grade of water-savingirrigationforcrop Irrigation rates based on current crop water deficit rates and forecast for precipitation levels for the next 3 days. 3.6 Irrigation quotas irrigationquota The amount of water per unit area or water depth at a given irrigation. Note. The unit is cubic meter per hectare (m3/hm2) or millimeter (mm).

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