|Author:||Deng, XiPing ; Shan, Lun ; Zhang, HePing ; Turner, N. C.|
|Book Group Author:||NA|
Water shortage in China, particularly in the north and northwest of China, is very serious. The region accounts for half of the total area of China, but has less than 20% of total national available water resources. While the water shortage in this region is severe, irrigation water use efficiency is only about 40%, with a typical agricultural water use efficiency of about 0.46 kg m-3. Excessive irrigation in Ningxia and Inner Mongolia has had a significant influence on downstream water users along the Yellow River. It is widely believed that an increase in the agricultural water use efficiency is the key to mitigating water shortage and reducing environmental problems. This paper reviews water-saving agricultural systems and approaches to improve agricultural water use efficiency in the arid and semiarid areas of China. The paper will cover biological mechanisms of water-saving agriculture and water-saving irrigation technologies, including low pressure irrigation, furrow irrigation, plastic mulches, drip irrigation under plastic, rainfall harvesting and terracing. In addition, the paper addresses the compensatory effect of limited irrigation and fertilizer supplementation on water use efficiency and highlights the need to breed new varieties for high water use efficiency. Considerable potential for further improvement in agricultural water use efficiency in the region depends on effective conservation of moisture and efficient use of the limited water.
|Pages:||23 - 40|
|Journal:||Agricultural Water Management|
agricultural production, arid zones, contour cultivation,farming systems, fertilizers, furrow irrigation, irrigation, irrigationsystems, irrigation water, mulches, mulching, reviews, semiarid zones,soil management, terracing, trickle irrigation, water conservation,water harvesting, water management, water use, water use efficiency,China, Nei Menggu, Ningxia, East Asia, Asia, Developing Countries,Northern China, China, North Western China, Plant Production (FF100),Plant Cropping Systems (FF150), Fertilizers and other Amendments(JJ700), Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management], Soil Management(JJ900), Water Resources (PP200), Erosion; Soil and Water Conservation(PP400)