| Effects of nitrogen application rate on temporal and spatial distribution characteristics of super high yield spring maize root and yield under drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2018.03.24 |
| Key Words: nitrogen rate spring maize root system temporal and spatial distribution yield |
| Author Name | Affiliation | | CHU Guang-hong | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHANG Jian-xin | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | GAO Yang | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | FU Ji-hai | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | TANG Chang-qing | Center of Spreading Agricultural Technique of Aksu Prefecture, Aksu， Xinjiang 843000, China | | WANG Na | Center of Spreading Agricultural Technique of Yining County, Yili， Xinjiang 835100, China |
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| Abstract: |
| To explore the effect of different nitrogen fertilizer on root distribution law of super-high-yield spring maize under drip irrigation. Five nitrogen levels (0,150，300，375，450 kg·hm-2) were used in the experiment to investigate the effect of root growth in 60 cm soil depth and yield of Spring Maize by soil profile sampling method. The results showed that, root dry weight and root length of super high yield spring maize were mainly concentrated in the 0～20 cm soil layer，and decreased after the first increase in the whole growth period, while the maximum was reached at the silking stage. Dry weight density and root length density of each layer significantly increased with nitrogen increase. Applying nitrogen can delay root senescence of Spring Maize in different soil layers significantly during booting with silking stage, especially the root activity increased significantly during grain filling period in 20～60 cm soil layer. When the amount of nitrogen fertilizer was 300 kg·hm-2, the root growth of spring maize was better, and the agronomic efficiency was up to 13.8 kg·kg-1, meanwhile, the grain yield was 17 117 kg·hm-2, and the yield increased by 32.10%. When we continued to increase the amount of nitrogen fertilizer, the yield increase was not significant, and the root trait of each soil parameter showed a decrease trend of change. Comprehensive consideration, the suitable nitrogen amount would be 300 kg·hm-2 at booting and silking stage, so that high yield can be achieved. |
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