GENERAL BACKGROUND READING
- Ai-Janabi , AS . 1988 . The effect of supplemental water use and yield of wheat under dryland farming. . Journal of agricultural water resources research. Soil water resources , 7 : 239 – 255 .
- Chinese Academy of Agricultural Sciences . 1993 . Dryland Agriculture Comprehensive Development of the Different climate region in North China. Beijing Agriculture Science and Technology Press of China .
- FAO fertilizer & plant nutritions bulletin . 1988 . Efficient fertilizer uses in summer rainfall areas. 11 Rome, , Italy : Food and Agriculture Organization of the United Nations .
- FAO . 1993 . Key aspects of strategies for the sustainable development of drylands. Rome, , Italy : Food and Agriculture Organization of the United Naitons .
- Wangsheng , Gao . 1994 . The developing strategy of agricultural resources of Zhenyuan County. . Agricultural Journal of Gansu , : 2 – 5 . (1)
- Wending , Huang and Xigu , Zhang . 1993 . Component Agriculture of China. Najing : Science and Technology Press of Jiangsu. .
- Tianen , Ma and Shiming , Gao . 1994 . A study on the techniques of retaining and using run-off efficiently in semi-arid loess plateau of China . Agricultural Modernization Research , : 166 – 171 .
- Oswal , MC . 1994 . Water conservation and dryland crop production in Arid and semi-arid regions. . Annals of Arid Zone , 33 ( 2 ) : 95 – 104 .
- Lun , Shan and Guoliang , Chen . 1993 . The Theory and Practice of Dryland Agriculture in Loess Plateau of China. Beijing : Science and Technology Press of China. .
- Yufeng , Tao and Lixiang , Wang . 1993 . The Exploitation of Water Potential in Dryland Area of Northern China. Beijing : Meteorological publishing House of China. .
- Gaihe , Yang . 1992 . A study on tillage system and ecological construction in arid and semi-arid area . Agricultural Research in Arid Areas ,