%A WANG Chongtao;LI Shaokun %T Yield Gaps and High-yielding Design of Corn %0 Journal Article %D 2012 %J Science & Technology Review %R 10.3981/j.issn.1000-7857.2012.07.008 %P 48-53 %V 30 %N 7 %U {http://www.kjdb.org/CN/abstract/article_8979.shtml} %8 2012-03-08 %X There is a huge gap betweem crop's actual and potential yields, among farmers in the same region and in different regions. It is very important to study the formation mechanism of the gap between the actual field yield and the potential yield, and to clear the way and to take technical countermeasures to narrow the gap for increasing the corn production to meet the increasing demand for food in future. Based on a review of studies of crop yield gaps and its causes, and an analysis of the yield formation characteristics of the record yield and the actual field yield related with the yields stability, the structure and the development characteristics of population, the variety selection, the characteristics of cultivation techniques and the climate, soil conditions, a technical program is designed in this paper to achieve a high yield from small plots to large areas. In addition, it is suggested that the realization of the potential yield should be in multi-levels, and the limiting factors to achieve the potential yield, the technical requirements and the yield-increasing ways are also not the same because of the different causes of the gap formation under the different yield goals. Therefore, the objectives, the contents, the structure and the methods of research and promotion of the high-yield technology must be adjusted accordingly in order to achieve the desired objectives.