Again, these factors do not increase the yield, but only protect the yield potential that has been built through proper selection and utilization of the yield-building factors.
再强调一遍，这些因素不能增加产量，但如应用得当，可使产量形成因素达到的产量潜势得到保护。
The problems of selection and utilization of parent, setting of crossing, and increasing the origin of genetic composition were further analyzed and discussed in details.
并对亲本选择利用，杂交组合的配置，扩大遗传组成源等方面进行分析探讨。
The problems of selection and utilization of parent, setting of crossing, and increasing the origin of genetic composition were further analyzed and discussed in details.
并对亲本选择利用，杂交组合的配置，扩大遗传组成源等方面进行分析探讨。
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