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培土大葱应多次培土,大约分4次进行,从大葱20 cm高时开始,每半月一次。每次培土高度以葱心叶不被埋为准,培土太浅不能强迫葱白伸长,过多则会造成烂心。
Earthing green onions should be repeated soil preparation, about four times, from 20 cm high onions when the start, once every two months. Each soil height to onion leaves are not buried as accurate, too light soil can not force light blue elongation, too much will cause bad heart.