不同菜薹（菜心）品种硝酸盐含量的差异

在水培条件下研究了41个菜薹（菜心）品种的生物量及硝酸盐含量。结果表明：菜心的生物量与成熟期呈极显著正相关，晚熟品种的生物量大，早熟品种的生物量较小|菜心不同品种间硝酸盐含量差异显著，并且薹茎的硝酸盐含量明显高于叶片。聚类分析将41个菜心品种划分为硝酸盐含量高、中、低的3个类群，硝酸盐含量高的类群（11个品种）生物量低，硝酸盐含量低的类群（18个品种）生物量高，硝酸盐含量中等的类群（12个品种）生物量处于中等水平。

Nitrate Content Discrepancies in Different Cultivars of Flowering Chinese Cabbage

Biomass and nitrate content in 41 cultivars of flowering Chinese cabbage(Brassica campestris L. var. utilis Tsen et Lee)were studied under hydroponic conditions.The results showed that the biomass and maturity stage of flowering Chinese cabbage had significant positive correlation.Cultivars of late maturity acquired large biomass,and cultivars of early maturity acquired smaller biomass.There were significant differences in nitrate contents of different flowering Chinese cabbage cultivars,and the nitrate content in flower stalk was obviousely higher than that in leaf blades.41 cultivars of flowering Chinese cabbage were divided into 3 groups of high,medium and low nitrate contents according to cluster analysis.The group with high nitrate content(11 cultivars)had lower biomass,and the group with low nitrate content(18 cultivars)had higher biomass,while the group with medium nitrate content(12 cultivars)had medium biomass.