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| Nitrate Content Discrepancies in Different Cultivars of Flowering Chinese Cabbage |
| SONG Shi-wei，YI Ling-yan，LIU Hou-cheng，SUN Guang-wen，CHEN Ri-yuan* |
| College of Horticulture，South China Agricultural University，Guangzhou 510642，Guangdong，China |
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Abstract 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．
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Received: 30 January 2012
Published: 19 March 2012
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