GB/T 34818-2017 English PDF

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GB/T 34818-2017: Computing methods of field water budget
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 34818-2017	199	Add to Cart	3 days	Computing methods of field water budget	Valid

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Basic data

Standard ID: GB/T 34818-2017 (GB/T34818-2017)
Description (Translated English): Computing methods of field water budget
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A47
Classification of International Standard: 07.060
Word Count Estimation: 10,113
Date of Issue: 2017-11-01
Date of Implementation: 2018-05-01
Regulation (derived from): National Standard Announcement 2017 No. 29
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 34818-2017: Computing methods of field water budget

---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.
Computing methods of field water budget ICS 07.060 A47 National Standards of People's Republic of China Calculation method of farmland water profit and loss Posted.2017-11-01 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released

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, Li Mao Song, Li Jiusheng, Xiaojing Jing, Mao Fei, Russia Hao, Wang Li, Zhang Lei, Yu Caixia, Wang Chunyan.

Introduction

The amount of farmland water surplus is an important basis for assessing the status of farmland soil water balance and for rational management of farmland water management. As a result of farming It is very difficult to measure the partial factors of soil moisture budget in soil directly. In practice, the profit and loss of cropland water are still calculated and obtained. In order to regulate the method of calculating the amount of profit and loss of farmland water so as to make it have space and time comparability, this standard is specially formulated. Calculation method of farmland water profit and loss

1 Scope

This standard specifies the calculation method of farmland water profit and loss. This standard applies to the calculation of farmland water profit and loss.

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 Farmland water profit and loss fieldwaterbudget Within a certain period of time, the depth of the soil in the root zone of the crop gets the difference with the lost moisture. Note. The unit is millimeter (mm). 3.2 Effective precipitation in farmland effectiveprecipitationinfield After a period of farmland of natural precipitation by plant retention, surface runoff and deep leakage, the actual replacement of a certain depth of soil in the net Water volume. Note. The unit is millimeter (mm). 3.3 Crop water demand Under normal fertility and optimal water and fertilizer conditions, plant transpiration, transpiration in the whole growing season (or a certain growing stage) and The sum of the amount of water that makes up the plant. Note. The unit is millimeter (mm). 3.4 Effective irrigation area effectiveirrigationamountinfield Irrigation water available for crop use. Note. The unit is millimeter (mm).

4 calculation method

4.1 Farmland water profit and loss calculation The formula for calculating the profit and loss of farmland water is shown in formula (1). ΔB = W Pe I NE (1) ......

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