几种化学物质配施对小白菜硝酸盐和营养品质的影响

采用311—A最优混合设计研究了3种化学物质赤霉素(GA)、钼酸铵(Mo)、双氰胺(DCD)对盆栽小白菜产量、硝酸盐含量和营养品质的影响。结果表明,3种化学物质不同组合量比对小白菜产量和收获期硝酸盐含量的效应均可用三元二次回归方程式定量描述,合理配施GA、DCD和Mo可显著增加小白菜产量,降低3个生长期小白菜叶片硝酸盐含量和提高小白菜叶片Vc、氨基酸含量,小白菜叶片钼含量与Mo施用量存在显著正相关,但小白菜叶片钼含量尚未超标。在本试验条件下,对小白菜硝酸盐、营养品质和产量综合调控效果较好的3个优化组合为:GA46.3mg.L+Mo441mg.L+DCD8.3mg.盆;GA28.7mg.L+Mo159mg.L+DCD8.3mg.盆;GA37.5mg.L+Mo300mg.L+DCD2.55mg.盆。

Effects of several chemicals on nitrate accumulation and nutritive quality of Chinese cabbage

The optimum mixed design, 311-A, was adopt to study the effects of different combinations of gibberellin (GA), ammonium molybdate (Mo) and dicyandiumide (DCD) on the yield and nitrate in leaf and nutritive quality of Chinese cabbage(Brassica chinensis). The results indicated that the effects of three chemicals on yield and nitrate content of Chinese cabbage could be quantitatively described by a regression equation with three factors. When GA, Mo and DCD were used reasonably, the yield of Chinese cabbage was increased, the nitrate in leaf at three growth stages was decreased obviously, and the content of Vc and amino acid were improved significantly. The accumulation of Mo in leaf directly correlated with the spraying concentration of ammonium molybdate, but it didn't exceed the heath limit to Mo. Under the experimental conditions, the optimum combinations of 3 chemicals applied to Chinese cabbage were GA 46.3 mg/L Mo 441mg/L DCD 8.3 mg/pot, GA 28.7 mg/L Mo 159 mg/L DCD 8.3 mg/pot and GA 37.5 mg/L Mo 300 mg/L DCD 2.55 mg/pot respectively.