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| Influence of nitrogen application on soil moisture-nitrogen dynamics and water-fertilizer use efficiency of <i>Zea mays</i> |
| Du Hongxia1,2,Wu Pute1,2,3,Feng Hao2，3,Wang Baiqun3,Ma Junyong1,2 |
| 1.College of Resource & Environment,Northwester A & F University;2.National Engineering Research Center for Water Saving Irrigation at Yangling; 3.Institute of Soil and Water Conservation,Chinese Academy of Science and Ministry of Water Resources: 712100,Yangling,Shaanxi,China |
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Abstract A field experiment was carried out to study the influence of applying nitrogen(N)-fertilizer on soil moisture,soil nitrate N(NO-3-N) distribution and accumulation amounts in soil profile,grain yield,water use efficiency(WUE),and nitrogen use efficiency(NUE) of Zea mays during different growth periods. The results show that variation of soil moisture and NO-3-N concentration in soil profile with soil depth show similar changes under different amount of N-fertilizer,namely soil moisture and NO-3-N in the 50 cm topsoil has a larger variation range than that did in the 50-110 cm,both of this reach lowest value in grouting stage.During different growth periods,soil water content(SWC) without nitrogen fertilizer application(NFA) is more than that with NFA in 50 cm topsoil,on the contrary,in 50-110 cm soil depth.Applicating N increased NO-3-N content significantly.Translocation of NO-3-N is affected by soil water content and NO-3-N content,the higher of the content the deeper movement in the soil.NFA could improve sharply WUE and grain yield(increase 28.52%-37.86%),the situation reach the summit at 240 kg/hm2 of NFA.Whit the N application rates enhance,grain yield and amount of N uptake by grain shows increased at first and then decreased,when applying N-fertilizer exceeded 240 kg/hm2,grain yield and WUE increase not significantly.N productivity and NUE have very significant between NFA and without NFA.Under this experiment conditions,results suggested that the optimal effect on boosting its yield,WUE,NUE and controlling soil NO-3-N accumulation for Zea mays happened with 120-240 kg/hm2 of NFA.
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Received: 22 November 2008
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