Effects of Combining Application of Nitrogen, Phosphorus and Zinc on Rice Seedling Growth and Activity of Antioxidant Enzyme

Studied the effects of combining application of N, P and Zn on rice(Oryza sativa L.) seedling growth and activity of antioxidant enzyme in Huazhong Agricultural University from April to June of 2010. Rice varieties Ⅱ-623 was test material and different N, P, Zn combinations were designed by pot experiments. The results showed that N played a main role in increasing rice plant height, content of leaf chlorophyll a and reducing the activity of SOD, POD, CAT and APX. Influence of P on root growth was greater than that of N and Zn. Compared with application N alone, combining application of N, P and N, Zn increased the rice plant height, content of leaf chlorophyll a, activity of leaf SOD, POD, CAT and APX. Compared with CK, balance application of nitiogen, phosphorus and zinc(NPZn) could increase the plant height, root length, root activity, and the content of the chlorophyll a, respectively, the balance application of NPZn could decrease the activities of SOD, POD, CAT and APX, respectively. In conclusion, balance application of nitrogen, phosphorus and zinc could relieve the effect of stress from nutrient environment, and promote the growth of root and the above of ground of rice seedling.