桑树有性杂交
Mulberry trees have sexual hybridization
以上为机器翻译结果，长、整句建议使用 人工翻译 。
通过人工有性杂交、单株选择、系统选择、区试鉴定，育成早生中熟桑树新品种农桑12号、农桑14号。
The early sprouting and mid maturing new mulberry varieties Nongsang 12 and Nongsang 14 were bred through hybridization, single plant selection, pedigree selection and regional test.
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