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By using pob45, pob46, pob69. pob70 this in my four years to improve the adaptability, has been able to adapt to temperate regions of the ecological environment, maintain a tropical germplasm good agronomic traits, flowering shed our backbone with flowering time, have great potential for the use of tropical germplasm groups with the top four male as heterosis group representatives inbred lines as early as four Huang ( Tong Sipingtou group), Dan 340 (Ludahonggu Group), B73 (Reid Group), Mo17 (Lan. group) hybridization experiments, different hybrid between the agronomic traits of difference and improved agronomic traits should use and promote the use of the method. The article also concludes that the appropriate used for the promotion of the advantages of hybrid groups : Ludahonggu × Pob70 group, Reid × Pob45 group, Lan. × Pob70 group, Lan. Group 4 × Pob45 this hybrid approach; suitable for the promotion of improved traits in a group Lan. × Pob69 group, Tong population × Pob69.

本文通过利用 pob 45 、 pob 46 、 pob 69,pob 70 这四个已在我国经过多年的适应性改良、已经能够适应温带地区的生态环境、保持有热带种质优良的农艺性状、开花散粉能与我国骨干花期相遇、有很大的利用潜力的热带种质群体做为父本与四大杂种优势群体的代表骨干自交系黄早四（塘四平头群）,丹 340（旅大红骨群）,B73（里德群）,Mo17（区域网络。群）进行杂交试验，得出不同杂交种之间的农艺性状的差异，及改良农艺性状时应该利用和不推广利用的方式。
文章还得出结论，适合推广用来进行优势杂交的群体是：旅大红骨群× Pob70 、里德群× Pob45，区域网络。群× Pob70，区域网络。群× Pob45 这四个杂交方式；适合推广用来改良性状的群体是区域网络。群× Pob69，塘四平头群× Pob69.