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| Effect of reduced nitrogen fertilization on spring maize production and environmental impacts in rain-fed areas |
| Received:November 19, 2015 |
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| KeyWord:spring maize;reduced nitrogen fertilization;grain yield;nitrous oxide;NO3--N |
| Author Name | Affiliation | E-mail | | WU De-feng | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | JIANG Ji-shao | Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China | | | SUN Qi-qi | Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China | | | WANG Rui | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | LI Ru-jian | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | WANG Zhi-qi | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | LIU Hong-xing | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | CUI Quan-hong | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | GUO Sheng-li | College of Resources and Environment, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | slguo@ms.iswc.ac.cn | | DANG Ting-hui | College of Resources and Environment, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | JU Xiao-tang | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | |
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| Abstract: |
| An experiment was designed to examine effects of reduced nitrogen(N) fertilization on spring maize production, greenhouse gas emissions and soil nitrate nitrogen(NO3--N) residue in under rain-fed farming systems. The three-year field experiment was performed at the Changwu State Key Agro-Ecological Experimental Station of the Loess Plateau, Chinese Academy of Sciences. Two treatments:traditional nitrogen(N200) and reduced nitrogen(N150) were employed. Soil mineral nitrogen and N2O emissions were determined regularly. Results showed that there were no significant differences in maize grain yields between N200(13.4 t·hm-2) and N150(13.3 t·hm-2). However, the cumulative N2O emissions in N150 was decreased by 24.3%, compared with that of N200. Within 0~200 cm soil profile, NO3--N residue in the N200 treatment was averagely 210.2 kg·hm-2, while it was reduced to 115.1 kg·hm-2 in N150 treatment. During the growth period of spring maize, the water consumption ranged from 354 to 493 mm, with no significant difference between the two treatments(P > 0.05). Reducing 25% of N fertilizer against the traditional N fertilization not only guarantees the maize yields, but also effectively decreases the N2O emissions and soil NO3--N residues in the cropping system in the Weibei rain-fed agricultural area. |
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