1. Reducing nitrogen application with dense planting increases nitrogen use efficiency by maintaining root growth in a double-rice cropping system
- Author
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Zhen Yang, Guan Xianjiao, Guoqiang Deng, Peng Chunrui, Shan Huang, Xiangcheng Zhu, Qiu Caifei, Chen Jin, Minggang Xu, Chen Xianmao, Tianhua Tu, Shao Caihong, Qian Yinfei, and Xie Jiang
- Subjects
0106 biological sciences ,Field experiment ,Agriculture (General) ,chemistry.chemical_element ,Biomass ,Environmental pollution ,Plant Science ,Biology ,engineering.material ,01 natural sciences ,S1-972 ,Cropping system ,South China ,Planting density ,Oryza sativa ,fungi ,Sowing ,food and beverages ,Agriculture ,04 agricultural and veterinary sciences ,Nitrogen ,Root morphology ,chemistry ,Agronomy ,040103 agronomy & agriculture ,engineering ,N recovery efficiency ,0401 agriculture, forestry, and fisheries ,Fertilizer ,Rice ,Agronomy and Crop Science ,010606 plant biology & botany - Abstract
Rational nitrogen (N) application can greatly increase rice (Oryza sativa L.) yield. However, excessive N input can lead not only to low N use efficiency (NUE) but also to severe environmental pollution. Reducing N application rate with a higher planting density (RNHD) is recommended to maintain rice yield and improve NUE. The effects of RNHD on fertilizer N fate and rice root growth traits remain unclear. We accordingly conducted a two-year field experiment to investigate the influence of RNHD on rice yield, fertilizer 15N fate, and root growth in a double-rice cropping system in China. In comparison with the conventional practice of high N application with sparse planting, RNHD resulted in similar yield and biomass production as well as plant N uptake. RNHD increased agronomic NUEs by 23.3%–31.9% (P
- Published
- 2021