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出口的大葱通用标准是植株完整、紧凑、无病虫害,叶肥厚、叶色深绿、蜡粉层厚,成品叶身和假茎长度比约为(1.2～1.5):1,假茎长40cm,直径2cm 左右,洁白、致密。以手握大葱假茎基部,能保持植株挺立5s 以上,假茎不弯曲、不折断为好。出口大葱要求周年均衡供应,生产上结合冬暖式大棚、拱棚等保护设施能够实现周年栽培周年供应。现将其关键栽培技术介绍如下:一、合理安排茬口,周年栽培一般2、3月份用冬暖式大棚育苗,苗龄50～60天,定植于拱棚内,8
Common standards for the export of green onions is complete plant, compact, no pests, leaf hypertrophy, leaf dark green, thick layer of wax, finished leaves and the length of the pseudostem (1.2 ~ 1.5): 1, About 2cm in diameter, white, dense. To hold onions on the stem of green onion, can keep the plants stand 5s above, not to bend the pseudostem, not broken as well. Export green onions require an annual supply of balanced, combined with winter-type greenhouse production, shed and other protection facilities to achieve annual breeding annual supply. Now its key cultivation techniques are as follows: First, a reasonable arrangement stubble, the annual cultivation in general February and March with winter warm greenhouse nursery, seedling age 50 to 60 days, planted in the arch shed, 8