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1990年,昌图县试种的560亩纸筒育苗甜菜获得高产,平均亩产4278公斤,每亩比直播田增产3058公斤。纸筒育苗每亩成本
In 1990, 560 mu of paper-tube seedling beet trial planted in Changtu County was high-yielding with an average yield of 4,278 kg per mu and a yield of 3,058 kg per mu more than that of the direct broadcast field. Paper tube nursery costs per mu