| 1 | The result indicated:(1) N was the main factor in nitrate accumulation, and the nitrate content of water spinach significantly increased with the rising of N fertilization amounts. | |
| 2 | The water spinach was used as the Zn carrying agents to make up the Zn lack in food. It was beneficial to human health. | |
| 3 | The pattern of plant purifying pond about wastewater treatment of oil factory with water spinach is provided and the feasibility, effectiveness and property of the way are also discussed. | |
| 4 | Because of a rapid increase of population in South China thereafter, the habitat that zizania grown had broken-down quickly by openning up cultivated land along the edge of lakes and rivers. |
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