Effects of waterlogging stress on change in nitrogen of winter wheat in South of China
Xiao Menghua1, Jin Qiu2, Chu Linlin1
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Jiangsu Water Conservancy Research Institute, Nanjing, Jiangsu 210017, China
Abstract：Water level control is a key technique to realize the united regulation of irrigation-drainage in a wheat field and plays an important role in improving the ecological environment of the field. In this paper, based on the water level control technology, the change of nitrogen in deep groundwater in winter wheat farmland is studied by using field experiment and laboratory analysis at different growth stages and water depths. It is shown that NH+4-N concentration in groundwater in flooding treatment is less than that in non-flooding treatment at the same drainage intensity, suggesting flooding helps reduce NH+4-N concentration in groundwater. Unfortunately, with the prolonging flooding time, the decreasing rate of NH+4-N concentration gets slow. Under the condition without flooding, the longer the groundwater control time is, the slower the drainage rate is, causing groundwater has enough time to contact with the soil and crop roots, and this is in favor of the decreasing NH+4-N concentration. Additionally, flooding can reduce NO-3-N concentration as well. In the case without flooding, the NO-3-N concentration increases slightly at reviving-tillering and jointing-booting stages under water level control, but the NO-3-N concentration rises considerably at heading-flowering and milking stages. There is a danger of NO-3-N leaching in the whole growth period of winter wheat.
肖梦华, 金秋, 褚琳琳. 涝渍胁迫对南方地区冬小麦氮素变化的影响[J]. 排灌机械工程学报, 2015, 33(7): 618-625.
Xiao Menghua, Jin Qiu, Chu Linlin. Effects of waterlogging stress on change in nitrogen of winter wheat in South of China. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(7): 618-625.
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