与常规育苗(单干秧苗)比较,双干苗根系发达,根体积增大,活跃吸收面积增加43.7%,根、茎、叶各部的干重均高于单干苗。定植后双干苗生长旺盛,叶面积和全株干重是单干苗的2倍多。同期播种的双干苗前期产量不如单干苗处理,可提前播种15～20天,弥补早熟性不强的缺点,但其总产量极显著地高于单干,双干40cm株距产量比对照(单30)增产59.8%。 Compared with the conventional nursery (single-seedling), the root system of double-stemmed seedlings developed, the root volume increased, the area of ​​active absorption increased by 43.7%, and the dry weight of the roots, stems and leaves was higher than that of the stems. After the double-dried seedlings planted strong growth, leaf area and whole plant dry weight is more than 2 times. The yield of the double-stem seedlings planted in the same period was not as good as that of the single seedlings, which could be sowed for 15 ~ 20 days in advance to make up for the shortcomings of the early maturity. However, the total yield of the double-stem seedlings was significantly higher than that of the single- ) Increase 59.8%.