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采用３１１－Ａ最优混合设计进行盆栽试验，研究了３种化学物质组合量比对莴笋茎叶产量和硝酸盐含量的影响，并对４个最适组配量比进行了田间莴笋和小白菜试验。结果表明，化学物质对莴笋茎、叶和总产量的效应可用三元二次回归方程式定量描述。化学物质组合可提高莴笋产量３．７％～２９．３％。其中，处理３（赤霉素２８．７ｍｇ／Ｌ＋钼酸铵１５９ｍｇ／Ｌ＋双氰胺４８．８ｍｇ／盆）、４（赤霉素４６．３ｍｇ／Ｌ＋钼酸铵１５９ｍｇ／Ｌ＋双氰胺４８．８ｍｇ／盆）、８（赤霉素２５ｍｇ／Ｌ＋钼酸铵３００ｍｇ／Ｌ＋双氰胺２６．３ｍｇ／盆）和１１（赤霉素３７．５ｍｇ／Ｌ＋钼酸铵３００ｍｇ／Ｌ＋双氰胺３７．５ｍｇ／盆）增量大，明显降低莴笋茎、叶硝酸盐含量（１３．７％～２２．６％）。田间试验４个最适组合量比提高莴笋茎、叶产量３．２％～１１．７％和小白菜产量６．３％～１１．８％；硝酸盐则分别降低１２．４％～４０．６％和１８．６％～２５．６％，大大改善了蔬菜食用价值
The best mixed design of 311-A pot experiments were conducted to study the effects of three chemical combinations on the yield and nitrate content of lettuce stems and leaves, and the four optimum combinations were lettuce and Chinese cabbage test. The results showed that the effects of chemical substances on stem, leaf and total yield of lettuce were quantitatively described by the triplicate regression equation. Chemical combinations can increase the yield of lettuce 3.7% ~ 29.3%. Among them, treatment 3 (gibberellin 28.7 mg / L + ammonium molybdate 159 mg / L + dicyandiamide 48.8 mg / pot), 4 (gibberellin 46.3 mg / L + ammonium molybdate 159 mg / L + dicyandiamide 48). 8 mg / pot), 8 (gibberellin 25 mg / L + ammonium molybdate 300 mg / L + dicyandiamide 26.3 mg / pot) and 11 gibberellin 37.5 mg / L + ammonium molybdate 300 mg / L + dicyandiamide 37. 5mg / pot) increased significantly, significantly reduce the lettuce stem and leaf nitrate content (13.7% ~ 22.6%). The four optimum combinations of field trials increased the stem and leaf yield of lettuce by 3.2% ~ 11.7% and the yield of cabbage by 6.3% ~ 11.8%, while the nitrate decreased by 12.4% ~ 40% respectively. 6% and 18.6% ~ 25.6%, greatly improving the value of vegetables