Abstract: Effects of soil amendments, including attapulgite （25 g·kg^-1）、 diatomite （25 g·kg^-1）、peat （25 g·kg^-1）and humic acid（4 g·kg^-1）on growth, quality and philological characteristics of young soybean grown in soil contaminated with heavy metals in combination were studied through pot experiment. Results show that compared with the clay minerals (diatomite and attapulgite), the organic materials (humic acid and peat) significantly increased yield and crude proteins content of the grains, and improved their eating quality. All the amendments mitigated the toxicity of heavy metals to plant. Humic acid, peat and attapulgite obviously increased SOD activity in leaves of the plants at the seeding stage （P＜0.05），but diatomite did not, till the plants reached the maturing stage. Among the amendments, only humic acid increased significantly chlorophyll content in leaves of the plants at the seedling and maturing stages （P＜0.05）. And humic acid was also the most effective in lowering contents of heavy metals in grain and decreased the content of Zn, Cu, Cd and Pb by 28.8%,21.6%,35.0% and 12.5%, respectively, as compared with CK. Diatomite followed in the effect, however peat and attapulgite did not show any significant effect in this aspect.

Key words: Heavy metal, compound pollution, amendment, young soybean, physiological characteristics, food quality