Improving the yield potential in maize by constructing the ideal plant type and optimizing the maize canopy structure

文献类型： 外文期刊

第一作者： Li, Rongfa

作者： Li, Rongfa;Wang, Zhigang;Li, Rongfa;Zhang, Guoqiang;Liu, Guangzhou;Wang, Keru;Xie, Ruizhi;Hou, Peng;Ming, Bo;Li, Shaokun

作者机构：

关键词： canopy structure; radiation utilization efficiency; spring maize; yield gap

期刊名称：FOOD AND ENERGY SECURITY （ 影响因子：4.109； 五年影响因子：8.33 ）

ISSN： 2048-3694

年卷期： 2021 年 10 卷 4 期

页码：

收录情况： SCI

摘要： Understanding the impact of changes in the crop canopy on yield is important in order to meet future food demands. We designed a field experiment to investigate the relationships between crop-related factors and yield gaps in maize to enhance crop yields from 2010 to 2018 in Qitai, China. Maize grain yields (n = 247) were divided into four yield ranges: <15 Mg ha(-1) (n = 30), 15-18 Mg ha(-1) (n = 79), 18-21 Mg ha(-1) (n = 114), and >21 Mg ha(-1) (n = 24). The characteristics of the maize canopy structure as well as the light interception, photosynthetic potential, and radiation utilization efficiency in these four yield ranges were analyzed. The canopy structure of treated fields with yields >21 Mg ha(-1) had a higher leaf area index (7.2), lower ear ratio (0.39), longer internodes above the ear (20.1 cm), larger leaf orientation value (LOV) above the ear (48.6), smaller leaf angle above the ear (18 degrees), and smaller LOV below the ear (36.0) when compared to the other treatments. These findings suggested that the yield gap is dependent on canopy structure, and the evolutionary trend also accounted for significant increases in post-LAD (p < 0.01), changes in crop growth rate (CGR; p < 0.01), net assimilation rate (NAR; p < 0.05), and radiation utilization efficiency. The radiation utilization efficiencies in the 15-18, 18-21, and >21 Mg ha(-1) treatments (1.23, 1.28, and 1.38 g MJ(-1), respectively) were higher than for the <15 Mg ha(-1) treatment (1.10 g MJ(-1)). Furthermore, there are opportunities to narrow the yield gaps by optimizing the canopy structure to make full use of the solar radiation resources. Our results will help breeders choose an ideal canopy structure to improve yield. In addition, our results may serve as a general guide for other maize growing regions.

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