Comprehensive Effect of the Water Table Management on the Surface Water Quality in Paddy Field and the Growth of Rice

By using the test method of the field district, we research and compare the content variation features of the nitrate nitrogen, the ammonia nitrogen on the surface of the water and the growth status of rice plant which are in the different water table management after fertilizing in the transgenic rice . The results show that the whole developing trend of the content of the nitrate nitrogen is rapidly increasing , and then is decreasing rapidly after reaching its maximum, but, the whole developing trend of the content of the ammonia nitrogen rises first and fall later. Contrasting the different water table management, the water layer is shallower, the decay rates of the nitrate nitrogen are faster and the content of the nitrate nitrogen of the water is lower. There is a linear positive correlation between the water layer depth and the decay rates, the content of the nitrate nitrogen. But under the deep water layer, the decay rates of the ammonia nitrogen are fastest and the content of the ammonia nitrogen of the water is lowest. However, there is a linear negative correlation between the water layer depth and the tiller number of rice. Therefore, the experiment proposes that using the irrigative method of the shallow water is better way in the transgenic rice. The results are helpful for decline of the content of the nitrogen on the surface water and the growth of rice.