Currently farmers in the same field are generally planted a corn hybrids such as can two or more varieties with mixed planting, grain yield per acre can 20--30 kg. This method does not require any input, and the technology is simple. The mechanism of its yield increase is mainly the utilization of the advantages of corn hybridization. Studies on the advantages of contemporary hybridization of maize showed that there was a phenomenon of pollen sensation among different varieties of maize, and the variation of the dominant hybridization strength was hybridization>free pollination>self-crossing, among which the number of kernels per spike, kernel weight and 100-grain weight were respectively freely pollinated. 40.7 tablets, 28.5 grams and 1.1 grams were added than selfing .
   There are many methods for utilizing the advantages of contemporary hybridization in production. For example, planting multiple varieties on the same plot, or interplanting or blending several maize hybrids in a certain proportion can give full play to their contemporary hybridization advantages and reduce the same variety. The chance of sister-to-sister exchange between the plants, so as to achieve the purpose of increasing food production.
   The following problems should be noted in the mixing of maize between different varieties:
   1 It is necessary to choose corn hybrids that are suitable for local planting and strong resistance, and are more suitable for varieties with far-reaching blood relationship.
   2 The selection of several corn varieties should be close to the growth period, in order to increase the rate of field hybridization.
   3 The selected corn varieties should have the same grain color so as not to affect the commodity quality of the grain.
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