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研究了引自中国南北廿个省、市的30个菠菜地方栽培种的No_3~-和No_2~-。其中属于无刺型和有刺型的各为15个。在田间试验条件下,新鲜菠菜的No_2~-一般均在1mg/kg以下,No_3~-均值含量无刺型1928mg/kg、有刺型1992mg/kg,统计检验无明显差异。但在各地栽培种种间,其No_3~-含量水平有明显差别。根处No_3~-的变异,经聚类分析处理,30个地方栽培种被划分为四大类群。No_3~-含量在2.0％(干重)以上的地方栽培种,共有22个,占总数73％,说明中国各地菠菜的卫生品质,大有改进的必要性。No_3~-含量在1％的第三群,其产量亦较高,似为最佳群。砂培等氮量试验证明了这些栽培种含No_3~-水平的高低,与各地栽培种具有的生理特性有关,为筛选低富集No_3~-品种提供了可能性。
The No_3 ~ - and No_2 ~ - of 30 spinach cultivars introduced from twenty provinces and cities in north and south China were studied. Which are non-stab-shaped and stab-shaped for the 15. Under the field test, No_2 ~ - of fresh spinach was generally under 1mg / kg, No_3 ~ - average stab-free 1928mg / kg, stab-shaped 1992mg / kg, no significant difference in statistical tests. However, there are significant differences in the levels of No_3 ~ - cultivated in various places. According to the cluster analysis and treatment, 30 local cultivars were divided into four groups. No_3 ~ - There are 22 cultivars with the content above 2.0% (dry weight), accounting for 73% of the total. This shows that the hygienic quality of spinach in different parts of China is greatly improved. No_3 ~ - content of 1% of the third group, its yield is also higher, seems to be the best group. Nitrogen tests such as sand culture proved that these cultivars contain No_3 ~ - levels, which are related to the physiological characteristics of cultivars in different loci, and provide the possibility of screening No_3 ~ - varieties with low enrichment.