title: [Coupling effect of water and nitrogen on spring maize in Wuwei Oasis of Shiyang River Basin, Northwest China].
abstract: To explore the optimal supply model of water and nitrogen for spring maize under limited irrigation in arid Northwest China, a field experiment with orthogonal design was conducted in the Wuwei Oasis region margin of Shiyang River Basin to study the effects of irrigation amount at different growth stages and the nitrogen application rate on the group yield and the water and nitrogen utilization of spring maize. With the increase of nitrogen application rate, the grain yield of spring maize increased, and the highest grain yield was obtained when the nitrogen application rate was 300 kg x hm(-2) and the irrigation amount at jointing stage was 136 mm. The grain irrigation water use efficiency (GIWUE) decreased with increasing irrigation amount. When the irrigation amount in whole growth period was 340 mm, the grain yield and GIWUE were improved simultaneously with increasing nitrogen application rate. The GIWUE reached the maximum when the nitrogen application rate was 300 kg x hm(-2) and the irrigation amount at seedling and grain-filling stages was 34 mm, respectively. The effects of nitrogen application and irrigation on the nitrogen accumulation in the whole plant decreased in the order of nitrogen application rate, irrigation at jointing stage, irrigation at seedling stage, irrigation at grain-filling stage, and irrigation at heading stage. The optimal supply model of water and nitrogen for spring maize in Wuwei Oasis was 300 kg x hm(-2) of nitrogen application plus 34, 136, 68 and 102 mm of irrigation at seedling, jointing, heading and grain-filling stages, respectively.
authors.affiliation: Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming 650500, China. liuxiaogang888@tom.com
authors.forename: Xiao-gang
authors.initials: XG
authors.lastname: Liu
authors.affiliation: Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China.
authors.forename: Fu-cang
authors.initials: FC
authors.lastname: Zhang
authors.affiliation: Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming 650500, China.
authors.forename: Qi-liang
authors.initials: QL
authors.lastname: Yang
authors.affiliation: Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China.
authors.forename: Yu-feng
authors.initials: YF
authors.lastname: Tian
authors.affiliation: Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China.
authors.forename: Zhi-jun
authors.initials: ZJ
authors.lastname: Li
mesh_terms: D057914:Agricultural Irrigation; D000383:Agriculture / Q000379:methods; D018533:Biomass; D002681:China; D017753:Ecosystem; D005308:Fertilizers; D009584:Nitrogen / Q000378:metabolism*; D012621:Seasons; D014867:Water / Q000378:metabolism*; D003313:Zea mays / Q000254:growth & development* / Q000378:metabolism
chemical_list: D005308:Fertilizers; D014867:Water; D009584:Nitrogen