1. Increased plant density with reduced nitrogen input can improve nitrogen use efficiency in winter wheat while maintaining grain yield.
- Author
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Dong, Shuxin, Zhang, Juan, Zha, Ting, Dai, Xinglong, and He, Mingrong
- Subjects
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PLANT spacing , *GRAIN yields , *SOIL profiles , *WINTER wheat , *NITROGEN , *ROOT development - Abstract
Plant density and nitrogen (N) input level have notable effects on root development, distribution in the soil profile, and in turn, N-uptake of winter wheat. Our study objectives were to identify whether a high yield can be maintained with a reduced N input by increasing plant density. Field studies were conducted during four successive seasons (2014–2015, 2015–2016, 2016–2017, and 2017–2018) using a widely planted cultivar, Tainong18. Two regimes of N fertilization (180 kg ha−1 and 240 kg ha−1) and three planting densities (135, 270, and 405 plants per m2) were used. Higher plant density led to increased root length density (RLD) and enhanced N uptake from the whole soil profile. The RLD in the soil profile at 0–1.2 m, 0–0.4 m, and 0.4–0.8 m decreased while in the 0.8–1.2 m layer it increased in response to reduced N input. The combined effects of higher plant density and lower N input resulted in reduced N uptake, a lower nitrogen nutrition index (NNI), unchanged grain yield, and improved N use efficiency. In conclusion, it is possible and sustainable to maintain a high wheat yield with reduced N input by increasing plant density. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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