【摘要】 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%。更多还原

【Abstract】 Compared with the normal single-trunk seedling, the double-trunk seedling has well developed root system and its active absorption area increases by 43.7% and the dry weights of the root and stem as well as leaf are also higher than that of single-trunk seedling. Double trunk seedlings grow luxuriantly after field planting. Their leaf area and whole plant dry weight are twice as those of single-trunk seedlings. The yield of double-trunk seedling in earlier stage is less than that of single-trunk seedling treatment if they are planted in the same time. If the planting time of the double-trunk plant shifts by 15 to 20 days earlier, the shortcomings will be eliminated and their tolal yield is obvioursly higher than that of single-trunk plants as increasing 59.8 percent.更多还原