| In order to demarcate the area suitable for GS Luohan 2 to grow, the principles and methods of the gray arrangement for crop cultivars were used to study the ecological types of the Huang Huai winter wheat zone to which GS Luohan 2 could adapt well so as to provide the basis of the large-scale extension of the cultivar. Meantime, the feasibility of the principles and methods of the gray arrangement for crop cultivars was discussed. The results showed that the regions suitable for the extension of GS Luohan 2 were the places represented by Binzhou county, Changwu county, Hebi county, Linyi county Luoyang city, Songxian county, Weinan city and Zhengzhou city. By the way, the principles and methods of the gray arrangement for crop cultivars reduced the limitation of the traditional crop arrangement which took only crop yields into account and thus could play a guiding role in the arrangement of crop varieties. |