<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区

          We have launched E-mail Alert service,subscribers can receive the latest catalogues free of charge

           
           
          You Are Here: Home > Reports

          Urgent Need to Improve Utilization of Agricultural Water Resources in Main Grain Producing Areas(No. 36, 2016)

          2016-05-13

          By Liu Yan, Information Center, Cheng Yu, Research Department of Rural Economy, DRC

          Research Report No 36, 2016 (Total NO 4919) 2016-3-28

          Abstract: With a strategic position for China's agricultural production and national food security, major grain producing areas contributed 75% of the national grain output and 90% of the increase in grain production (except 2007 and 2009). However, the constraints of water resources in major grain producing areas have become increasingly grim. On one hand, food production is facing water resource constraints due to limited per capita water resources and asymmetrical balance between soil and water resources. On the other hand, the level of water resource development and utilization of grain production is not high. The extensive irrigation method has led to serious waste of water, and the serious degrading of irrigation facilities has resulted in backward mechanism. Therefore, it is an urgent need to improve the utilization of agricultural water resources in major grain producing areas. It is recommended that we should establish an overall control on agricultural irrigation water amount as well as a quota management system. We should make coordinated efforts to strengthen infrastructure construction of farmland irrigation, and introduce and innovate high efficiency and water saving irrigation engineering. In addition, we should establish an integrated protection system of farmland, water, irrigation and drainage, and further improve the farmland water conservancy management system.

          Key words: agricultural water resources, utilization, major grain producing areas

           
          主站蜘蛛池模板: 欧美成人午夜在线观看视频| 制服丝袜人妻有码无码中文字幕| 亚洲男女一区二区三区| 无码人妻专区免费视频| 国产精品深夜福利在线观看| 欧美精品国产综合久久| 中文成人无字幕乱码精品区| 色AV专区无码影音先锋| 国产丝袜一区二区三区在线不卡| 韩国免费a级毛片久久| 黄色三级视频中文字幕| 99久久精品国产熟女拳交| 国产美女午夜福利视频| 天美传媒mv免费观看完整| 黄色A级国产免费大片视频| 久久久www成人免费毛片| 熟女系列丰满熟妇AV| 人与性动交aaaabbbb视频| 99久久精品国产一区二区| 动漫AV纯肉无码AV电影网| 熟女人妻aⅴ一区二区三区电影| 免费99精品国产人妻自在现线| 亚洲高清在线天堂精品| 亚洲一区二区精品另类| 日韩在线永久免费播放| 亚洲熟妇熟女久久精品一区| 欧美乱大交aaaa片if| 亚洲国产一区二区三区亚瑟| 4hu四虎永久在线观看| 99国产精品欧美一区二区三区| 国内精品无码一区二区三区| 中文字幕精品久久天堂一区| 久久亚洲精品11p| 人人妻人人做人人爽| 丰满少妇被猛烈进出69影院| 久久精品国产主播一区二区| 日韩av天堂综合网久久| 狠狠躁天天躁中文字幕| 国产伦精区二区三区视频| 久久久精品人妻一区二区三区 | 99久久无色码中文字幕|