| This article has been：Browse 1187Times Download 1068Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.20180136 |
|
| Nitrogen Use Efficiency and Ammonia Oxidation of Corn Field with Drip Irrigation in Hetao Irrigation District |
|
LI Zhe, QU Zhongyi, REN Zhongsheng, YANG Shaodong, XU Zhe, HA Sigerile, LI Mao
|
|
1. College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;2. Emancipation and irrigation Administration Bureau of Hetao Irrigation Area, Inner Mongolia, Hangjinhouqi 015400, China
|
| Abstract: |
| 【Objective】 Reducing nitrogen loss via leaching and emission is critical to developing sustainable agriculture and the purpose of this paper is to experimentally study the nitrogen use efficiency and ammonia oxidation of a corn field in Hetao Irrigation District. 【Method】 The experiment was conducted in a field in which and we considered five fertilizations with the N∶P2O5∶K2O ratio at 0∶0∶0, 62∶72.9∶40.5, 216∶97.2∶54, 270∶121.5∶ 67.5, and 324∶145.8∶81 kg/hm2 respectively. In each treatment, ammonia vocalization was measured using the Aeration method. In the meantime, we also analyzed the accumulation of ammonia volatilization, its net loss rate, corn yield and nitrogen utilization efficiency.【Result】 The ammonia volatilization rate increased after drip irrigation and fertilization, peaking second day after the irrigation. When the applied nitrogen was more than 216 kg/hm2, the amount of ammonia volatilization increased significantly with the applied nitrogen. The accumulation of ammonia volatilization at different fertilizations over the whole growth period was 6.14~17.56 kg/hm2 and the net loss rate was 1.93%~3.52%. Soil ammonia volatilization rate was significantly correlated with soil temperature (P<0.05) and soil moisture (P<0.01). The yield of maize peaked when the N∶P2O5∶K2O ratio was 250∶112.5∶62.5 kg/hm2, with the ammonia volatilization substantially reduced. 【Conclusion】 An appropriate N∶P2O5∶K2O ratio with drip irrigation can effectively improve crop yield and nutrient utilization efficiency, thereby reducing nitrogen losses. |
| Key words: fertigation; ammonia volatilization; maize; nitrogen use efficiency |
|
|
