Shortening breeding cycle depends on how to overcome the long time span before first flowering and on early selection and test.
决定缩短育种轮回的因素是如何克服林木始花龄晚和能否有效进行早期测验和选择。
During the course of this varietal improvement, the techniques for shortening breeding cycle were adopted in developing new rice varieties.
在品种改良过程中，用缩短培育周期的技术培育新稻种。
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