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青島市崂山地区每年栽培甘薯的面积很大,1964~1965年其栽培面积約占崂山地区农耕地面积一半以上;但单位面积产量較低,春甘薯历年平均在1,500~2,000斤之間,夏甘薯(鲜薯)在1,500斤左右。因此全面研究甘薯的增产途径,就成为青島市崂山地区农业生产的一項重要任务。本項試驗,在于
Laoshan Prefecture, Qingdao City, annual cultivation of sweet potato is very large area, 1964 ~ 1965, its cultivation area accounts for about half of the Laoshan area of ?? agricultural land; but lower yield per unit area, annual average annual sweet potato between 1,500 to 2,000 pounds, summer sweet potato (Fresh potato) in about 1,500 pounds. Therefore, a comprehensive study of ways to increase production of sweet potato has become an important task of agricultural production in Laoshan district of Qingdao. This test is