硒营养对菜心（菜薹）植株生长、产量和品质的影响

采用水培试验，设置0、0.25、0.5、1.0 mg/L 4个硒浓度，研究了硒营养对菜心植株生长、菜薹产量和品质的影响。结果表明；硒对菜心植株的菜薹长度、菜薹节数、菜薹节间长度影响不显著，但适宜浓度的硒可显著地促进菜薹的膨大，增加其粗度，提高菜薹的产量。硒营养对菜心叶片与茎品质的影响不同，硒明显地提高了茎和叶的Vc含量、游离氨基酸含量和叶片类胡萝卜含量，降低了茎可溶性蛋白含量、叶可溶性糖含量和硝酸盐含量，但对叶片叶绿素含量和可溶性蛋白含量与茎可溶性糖含量、硝酸盐含量和粗纤维含量的影响不明显。硒处理可促进菜心植株对硫和硒的吸收，提高植株的硫和硒含量。

Effects of selenium on plant growth, yield and qualityof flower stalk in Chinese flowering cabbage

Hydroponics experiment was conducted to investigate effects of different concentrations (0, 0.25 , 0.5, 1.0mg/L) of Selenium Se on plant growth, yield and quality of flower stalk in Chinese flowering cabbage Brassica campestrisL.ssp. chinensis var. utilis Tsen et Lee . The results showed that appropriate concentration of Se could promote theenlargement of flower stalk and increase the yield, but Se didnt have noticeable effects on the number and length of flowerstalk. Se had different effects on quality of leaf and stem of flower stalk. Se could significantly increase the content ofvitamin C and free amino acid of leaf and stem, renieratene of leaf, and decrease the content of soluble protein of stem,soluble sugar and nitrate of leaf, however, the contents of chlorophyll and soluble protein of leaf, soluble sugar and nitrateand crude fiber of stem were almost not affected by Se. Se obviously increased the absorption of S and Se of plant.