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Introduction

By Food and Agriculture Organization of the United Nations

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Book Id: WPLBN0000678255
Format Type: PDF eBook
File Size: 48,933 KB.
Reproduction Date: Available via World Wide Web.

Title: Introduction  
Author: Food and Agriculture Organization of the United Nations
Volume:
Language: English
Subject: United Nations., Food and Agriculture Organization of the United Nations. FAO agriculture series, Agriculture
Collections: United Nations Food and Agriculture Organization Collection
Historic
Publication Date:
Publisher: Food and Agriculture Organization of the United Nations (FAO)

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Agriculture Organization Of The United Nations, F. A. (n.d.). Introduction. Retrieved from http://www.nationalpubliclibrary.info/


Description
Nutrition Reference Publication

Summary
Electronic reproduction.

Excerpt
Excerpt: Large-scale development of irrigation has taken place in many arid and semi-arid areas since the late nineteenth century. Although irrigation has greatly increased the agricultural production potential, recharge brought about by seepage losses from the irrigation network and deep percolation from farm irrigation has accumulated into the underlying groundwater. A rise in water table results when irrigation-induced recharge is greater than the natural discharge. In many irrigated areas around the world, rising water tables have subsequently led to waterlogging and associated salinity problems. This has happened where drainage development has not kept pace with irrigation development or where maintenance of drainage facilities has largely been neglected. As an example of the historical rise in the groundwater table after the introduction of large-scale irrigation, Figure 1 shows the elevations of the ground surface and the variations of the phreatic level in an irrigated area in Punjab, Pakistan.


 

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