There are obvious differences between clones with regard to their self-fertility.

交 能孕性在不同的无性系中是明显不同的。

youdao

The self-fertility of Peiai64S lines collected from the same source but different years were compared and the difference was also found.

另外，对历年培矮64S在气候箱内鉴定的自交结实率的结果进行分析比较，发现不同年度间繁育的培矮64S光温反应特性也存在差异。

youdao

It is concluded that the mixed stand can be able to be self-rich in soil fertility, which benefit the maintenance and improvement of site fertility under Chinese fir plantation.

表明杉木拟赤杨混交林具有良好的培肥土壤功能，对杉木人工林的地力维持和提高有重要意义。

youdao

Because very low fertility can become self-reinforcing, with children of one-child families wanting only one child themselves, China now probably faces a long period of ultra-low fertility, regardless of what happens to its one-child policy.

ECONOMIST: Demography

Currently, fertility treatment practices in the U.S. are largely self-regulated.

FORBES: Balancing the Rights of Donor Offspring With Those of Donors: But What About Parents?