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- Title
Nitrogen Accumulation Characteristics of High-Yield Spring Maize in Northeast China.
- Authors
Geng, Yuhui; Cao, Guojun; Wang, Shuhua
- Abstract
Achieving a high yield is an ongoing major challenge to meet China’s increasing food demand. The N accumulation characteristics of high-yield spring maize are likely different from those of conventional-yield spring maize. A 2-year field experiment was conducted to investigating the N accumulation characteristics of high-yield (HY) (> 15 t ha−1) spring maize in comparison with spring maize of medium yield (MY) and low yield (LY). The maximum N stage accumulation appeared between stages V6 and V12. N stage accumulation of LY decreased rapidly after the V12 stage, while N stage accumulation of HY remained high until the R2 stage and was two times that of LY at the R2 stage. The percentage contribution of N stage accumulation to the total accumulation was lower for HY than for LY during the vegetative stages (VE to VT), but higher for HY than for LY during the reproductive stages (VT to R6). The N remobilization amount in different organs was higher for HY than for MY and LY. The total apparent contribution to grains of HY (58.1%) was lower than that of MY (60.2%) and LY (75.5%), suggesting that most of the final grain N of HY was directly derived from the root system supply during the reproductive stages. Overall, these results indicated that maintaining a sufficient N supply during the growing stages, especially the reproductive stages, can increase the amount of N uptake, delay leaf senescence and maintain high photosynthetic activity, leading to a high yield.
- Subjects
NITROGEN content of grain; CORN reproduction; CORN yields; CORN farming
- Publication
International Journal of Plant Production, 2018, Vol 12, Issue 3, p149
- ISSN
1735-6814
- Publication type
Article
- DOI
10.1007/s42106-018-0015-1