Evaluation of Regional Difference of Agricultural Water Use Efficiency in China

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  • 中国における農業用水効率性の地域差とその評価
  • チュウゴク ニ オケル ノウギョウ ヨウスイ コウリツセイ ノ チイキサ ト ソノ ヒョウカ

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The increases in water demand associated with rapid socio-economic development led to water shortage in the northern part of China, such as in the Yellow River basin. Nowadays, the use of agriculture water is beginning to be restrained by the increase in new water uses, such as industrial water and domestic water; and by rapid pace of industrialization and urbanization. However, it is significant to secure agriculture water to meet the increasing and diverse food demand of its growing population. Subsequently, the Chinese government plays a central role in the efforts to overcome the water shortage, such as in the ‘South to North Water Transfer Projects. In order to resolve the issue of such water shortage, it is important to understand how water can be used in the most physically and economically efficient way, and the extent on how much water use can be reduced in what regions. The effective and rational use of agriculture water is necessary if the country is to achieve a sustainable agricultural production. From this viewpoint, we applied DEA (Data Envelopment Analysis) techniques to a provincial level dataset to estimate the efficiency of agricultural water use in China. In addition, we compared and examined the differences of efficiencies among the main river basins which are created by the administrative unit on a province level. We also identified determinant factors affecting the efficiencies using the Tobit model.

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