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“旅城4号”是由自交不亲和系配制的杂种一代。即“旅大小根7305—1—4—5”ד城阳青7311—3—2—5”。该组合自1973年起选用“旅大小根”、“城
“Brigade 4” is a hybrid generation formulated from self-incompatible lines. That “brigade size root 7305-1-4-5” × “Chengyang green 7311-3-2-5.” The combination since 1973, the choice of “brigade size root”, "city