杂交育种是将父母本杂交，形成不同的遗传多样性，再通过对杂交后代的筛选，获得具有父母本优良性状，且不带有父母本中不良性状的新品种的育种方法。
Cross breeding is an important method for tree improvement of Eucalyptus. The use of heterosis plays an important part in breeding.
桉树(Eucalyptus)杂交育种是桉树遗传改良的重要手段。
参考来源 - 桉树花粉贮藏及控制授粉技术研究And afterwards it will be developing way of article crossbreeding to set up clone seed orchard with low tree.
而建立无性系矮化种子园将成为今后桉树人工杂交育种的发展方向。
参考来源 - 桉树纸浆用材林良种选育技术研究In all dose groups, 25 GY radiation dose and 50 GY were suitable to use as hybrid breeding materials.
各剂量组中比较适合做杂交育种材料的辐射剂量是25GY和50GY。
参考来源 - ~（60）Co·2,447,543篇论文数据，部分数据来源于NoteExpress
豇豆杂交育种按照传统的方法存在坐果率低的问题。
Cowpea crossbreeding has the problem that fructify cation is low according to the traditional method.
也在于这个时期的技术被引进与外地的月季杂交育种和杂交。
Also about this time techniques were being introduced in the field of rose cross-breeding and hybridization.
水稻育种从常规育种到杂交育种方式的转变，大大提高了水稻的产量和质量。
Since rice breeding changed from the conventional to the hybrid, rice production and quality have been greatly increased.
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