DCD does not show notable effect on growth of spinach but results in a substantial reduction in nitrate and nitrite contents, and a significant increase in Vc content in spinach.

• 说明在施用氮肥时配施氮用量的 10%25双氰胺，对降低蔬菜硝酸盐含量及提高品质是有效的。 尽管增施钾肥能明显促进蔬菜的生长、降低蔬莱硝酸盐、亚硝酸盐含量、提高蔬菜Vc含量，但对双氰胺的效果没有影N6）。