Abstract: The experiment was carried out with Chinese flowering cabbage seedlings cultured in soilless substrates.The effects of 32-hole(T1),50-hole(T2),72-hole(T3) and 128-hole(T4) plugs on the growth of the seedlings were studied.The results showed that the differences of main growth indexes and root morphological indexes increased with the increase of seedlings age. On the 17th day,the plant height and the stem diameter of T1,T2 treatments were significantly higher than those of T3 and T4 treatments,and the aerial fresh weight and dry matter accumulation rate of T1,T2 and T3 treatments were much larger than those of T4 treatment.The ranking order of total number of root tips and the number of root branches from big to small was T1,T2,T3,T4.The total length,the total surface area and the total volume of the roots of T1 and T2 treatments were larger than those of T3 and T4 treatments.The accumulations of N,P,Ca,Mg,S in T1,T2,T3 treatments were higher those in than T4 treatment,and the accumulation of K was significantly higher in T2 treatments than that in T3 and T4 treatments.The quality of the seedlings significantly affected plant growth after transplanting.The growth indexes of the were measured 7 days after transplanted to the field(17-day-old plants).The plant height and shoot fresh weight of T1 and T2 treatments were higher than those of T3 and T4 treatments.The aerial dry weight and dry matter accumulation rate ranked as T1,T2,T3(T4) from big to small.The accumulation of N,P,K,Ca,Mg,S of T1 treatment was significantly higher than that of T2 treatment,and T2 treatment was significantly higher than that of T3 and T4 treatments.In summary,if Chinese flowering cabbage seedlings are transplanted at more than 17-day age,it will be better to be nursed in a less hole plug,such as 32-hole or 50-hole plug.

Key words: Chinese flowering cabbage, Seedling, Plug size, Root morphology

摘要： 为筛选最适的菜心工厂化育苗穴盘，以菜心为试材进行穴盘育苗，研究32穴（T1）、50穴（T2）、72穴（T3）以及128穴（T4）4种规格穴盘对菜心幼苗生长的影响。结果表明，不同规格穴盘幼苗的主要生长指标以及根系各形态指标差异随苗龄增加逐渐加大，在苗龄17 d时出现明显差异，T1、T2处理株高、茎粗明显大于T3、T4处理，T1、T2、T3处理地上部鲜质量与干物质积累速率远大于T4处理,总根尖数和根系分支数表现为T1＞T2＞T3＞T4，根系总长度、根系总表面积、根系总体积表现为T1、T2大于T3、T4,T1、T2、T3处理的N、P、Ca、Mg、S积累量显著高于T4处理，T2处理K的积累量明显高于T3、T4处理。幼苗的质量显著影响移栽后植株的生长。定植大田(苗龄17 d)后7 d，T1、T2处理株高和地上部鲜质量显著大于T3、T4处理，地上部干质量和干物质积累速度表现为T1＞T2＞T3、T4，N、P、K、Ca、Mg、S积累量T1处理显著高于T2处理，T2处理显著高于T3、T4处理。综上所述，菜心17 d以上苗龄移栽最好选用大孔穴盘，如32或50穴穴盘。

关键词: 菜心, 育苗, 穴盘规格, 根系形态