Nitrogen/potassium interactions increase rice yield by improving canopy performance,Food and Energy Security

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Nitrogen/potassium interactions increase rice yield by improving canopy performance
Food and Energy Security ( IF 4.0 ) Pub Date : 2021-05-25 , DOI: 10.1002/fes3.295
Tinghong Ye _{1,

2} , Jianglin Zhang _{1,

2} , Jing Li _{1,

2} , Jianwei Lu _{1,

2} , Tao Ren _{1,

2} , Rihuan Cong _{1,

2} , Zhifeng Lu _{1,

2} , Xiaokun Li _{1,

2,

3}

Affiliation

The interactions between nitrogen (N) and potassium (K) are important determinants of rice yield, but the mechanisms involved remain poorly understood. For example, N/K interactions may influence light utilization and N distribution in the canopy. Field experiments were therefore performed to resolve this issue, using factorial combination of N and K. The interaction between N and K had a significant effect on the grain yield, N uptake, and the NUE of grain production (NUEg), and biomass production (NUEb). The application of either N or K alone resulted in lower yields than the combined application of these nutrients. The combined application of N and K increased rice yields by 54.5% in 2018 and by 76.1% in 2019, compared with N0K0. Similarly, N uptake, NUEg, and NUEb were higher when N was supplied with K than with N application alone. The higher grain yields, N uptake rates, and NUEs observed with the combined N and K treatment were attributed to the following: (1) a higher leaf area index that resulted in better light interception; (2) improved the coordination of light and N distribution within the canopy. Evidence for improved light use by photosynthesis is provided by the observed lower light extinction coefficient (K_L), the higher specific leaf N in the top leaves (SLN_o), higher extinction coefficients for effective leaf N (K_N) and K_N/K_L values. We conclude that the interactions between N and K support higher yields by improving canopy performance even at lower N rates.

中文翻译：

氮/钾相互作用通过改善冠层性能提高水稻产量

氮 (N) 和钾 (K) 之间的相互作用是水稻产量的重要决定因素，但所涉及的机制仍知之甚少。例如，N/K 相互作用可能会影响树冠中的光利用和 N 分布。因此，通过田间试验，使用 N 和 K 的因子组合来解决这个问题。 N 和 K 之间的相互作用对粮食产量、N 吸收、粮食生产的 NUE (NUEg) 和生物量生产有显着影响。 NUEb)。单独施用 N 或 K 导致的产量低于这些营养素的组合施用。与N0K0相比，2018年和2019年N和K配施水稻增产54.5%和76.1%。类似地，当 N 与 K 一起供应时，N 吸收、NUEg 和 NUEb 比单独施氮时更高。N 和 K 联合处理观察到的更高的谷物产量、N 吸收率和 NUE 归因于以下原因：(1) 更高的叶面积指数导致更好的光拦截；(2) 改善了冠层内光氮分布的协调性。观察到的较低的消光系数提供了光合作用改善光利用的证据（K _L )，顶部叶片中的特定叶片 N (SLN _o ) 越高，有效叶片 N ( K _N ) 和K _N / K _L值的消光系数越高。我们得出结论，即使在较低的 N 率下，N 和 K 之间的相互作用也能通过提高冠层性能来支持更高的产量。

更新日期：2021-05-25

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