| Effects of nitrogen application at different stages on growth, yield, and dry matter transportation of summer maize |
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| DOI：10.7606/j.issn.1000-7601.2018.01.12 |
| Key Words: nitrogen application at different stages summer maize growth yield dry matter translocation |
| Author Name | Affiliation | | ZHOU Qi | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Fu-cang | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Zhi-jun | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | QIANG Sheng-cai | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | TIAN Jian-ke | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Guo-dong | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | FAN Jun-liang | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Under the same nitrogen application amount, the effects of nitrogen application at different growth stages on growth, yield and dry matter transportation of summer maize in Guanzhong District of Shaanxi Province were explored. There were seven nitrogen treatments with the same nitrogen application amount: zero nitrogen application (N0, as control); all nitrogen application at elongation stage (N1); all nitrogen application at bell stage (N2); all nitrogen application at silking stage (N3); separate nitrogen application at elongation stage and bell stage (N4); separate nitrogen application at elongation stage and silking stage (N5); separate nitrogen application at elongation stage, bell stage and silking stage (N6). The results showed that the N4 significantly improved the yield and dry matter accumulation compared with the other treatments. Compare to N1, the yield of N4 was increased by 5.56%, the leaf area was increased by 8.03%, and the dry matter was increased by 8.29%. There were no significant difference between the yield and dry matter accumulation of N2, N5 and N6, whose average yield and dry matter accumulation increased were increased 4.0%, 4.7% and 4.1% compare to N1, respectively. The yield and dry matter accumulation of N1 and N3 were much lower than those of the other treatments, which indicate that separate nitrogen application could improve the yield and dry matter accumulation compared with all nitrogen application at a single growth stage. Nitrogen split application at elongation stage and bell stage was considered as the optimum nitrogen application mode. The dry matter translocation efficiency of N3, N5 were lower than the other treatments, but they maintained much more green leaf area at mature stage. The dry matter translocation efficiency of N3 was 5.5% less than that of N4, while the accumulation of dry matter after silking stage was increased by 4.1% compared with N4. The dry matter translocation efficiency of N5 was 8.6% less than that of N4, while the accumulation of dry matter after silking stage was increased by 7.8% compared with N4. The results indicate that nitrogen application at silking stage can help retarded the senescence of leaves, which can raise the yield of summer maize by maintaining higher photosynthetic rates. |
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