文献类型： 外文期刊

作者： Liu, Kunyu ¹ ; Meng, Meilian ¹ ; Zhang, Tingting ³ ; Chen, Youjun ⁴ ; Yuan, Haotian ² ; Su, Taimin ¹ ;

作者机构： 1.Inner Mongolia Agr Univ, Dept Agr, Hohhot 010018, Peoples R China

2.Inner Mongolia Acad Agr & Anim Husb Sci, Maize Res Inst, Hohhot 010031, Peoples R China

3.Inner Mongolia Acad Agr & Anim Husb Sci, Inst Resources Environm & Sustainable Dev, Hohhot 010031, Peoples R China

4.Inner Mongolia Agr Univ, Dept Biosci, Hohhot 010018, Peoples R China

关键词： nitrogen use efficiency; nitrogen-efficient varieties; source-sink capacity; source-sink activity; growth stage

期刊名称：AGRONOMY-BASEL （ 影响因子：3.7； 五年影响因子：4.0 ）

ISSN：

年卷期： 2023 年 13 卷 4 期

页码：

收录情况： SCI

摘要： Nitrogen is an essential nutrient for plant growth. However, the excessive use of nitrogen fertilizers not only increases production cost, but also has negative a impact on the environment. The purpose of this study was to quantify the source-sink characteristics and length of each growth stage in two potato varieties under different nitrogen application rates. This clarifies the source-sink coordination characteristics of the nitrogen-efficient variety and the source-sink coordination mechanisms of high nitrogen use efficiency (NUE). Field experiments were conducted in 2019, 2020, and 2021 using a split-plot design, with a nitrogen application rate of (0; 150 kg center dot ha(-1); 300 kg center dot ha(-1)) as the main plot and variety (J, nitrogen-efficient variety Jizhang 12; Y, nitrogen-inefficient variety Youjia 70) as the subplot. The results showed that the yield and NUE of Jizhang 12 at 300 kg center dot ha(-1) were, on average, 90.73% and 75.15% higher than those of Youjia 70, respectively. The NUE and nitrogen utilization efficiency of Jizhang 12 increased on average, with decreasing N application at 68.66% and 24.53%, which were higher than those of Youjia 70 at 62.89% and 10.86%. Quantitative analysis of the source and sink showed that the Jizhang 12 had a higher source and sink capacity of 23.45 g and 51.85 g, respectively, and the maximum source and sink activity was on average 0.28 g center dot plant(-1)center dot d(-1) and 1.47 g center dot plant(-1)center dot d(-1) higher, and the growth period of the source and sink was on average 24 days and 7 days longer, respectively. On the basis of these results, the nitrogen-efficient varieties had a higher yield base and a smaller reduction in NUE with reduced N application. In terms of source-sink growth, N-efficient varieties lasted longer at the seedling and tuber initiation stages, when potatoes grew above ground and source organs grew for longer periods, providing a solid foundation for later sink growth, as evidenced by their higher source-sink activity, capacity, and growth time than N-inefficient varieties.