Xu Haicheng, Liu Mei, Li Chuanxing, Tang Yuhai, Xue Qiqin, Xiao Wanli, Gao Dongyao, Peng Dianliang, Dai Xinglong
Shandong Provincial University Laboratory for Protected Horticulture, Weifang University of Science and Technology, Weifang 262700, China.
Shouguang Vegetable Industry Development Center, Weifang 262700, China.
Plants (Basel). 2024 Jul 24;13(15):2036. doi: 10.3390/plants13152036.
Increased aboveground biomass is contingent on enhanced photosynthetically active radiation intercepted by the canopy (IPAR), improved radiation use efficiency (RUE), or both. We investigated whether and how optimized agronomic management practices promote IPAR and RUE. Four integrated agronomic management treatments, i.e., local traditional practice (LP), improved local traditional practice (ILP), high-yield agronomic management (HY), and improved high-yield agronomic management (IHY), were compared over two wheat ( L.) growing seasons. The average grain yield obtained with IHY was 96% relative to that of HY and was 7% and 23% higher than that with ILP and LP, respectively. Both HY and IHY consistently supported large values of the leaf area index and IPAR fraction, thereby increasing total IPAR. Treatment HY showed increased pre-anthesis RUE, manifested as a higher specific leaf nitrogen content and whole-plant N nutrition index at anthesis. The highest pre-anthesis aboveground biomass was obtained with HY due to the highest pre-anthesis IPAR and RUE. Along with a higher canopy apparent photosynthetic rate, IHY produced higher post-anthesis aboveground biomass due to its higher post-anthesis IPAR and RUE. Treatment IHY had a slightly lower total IPAR but a similar total RUE and harvest index, thus producing a slightly lower grain yield relative to HY. These results demonstrate that the optimized agronomic management practice used under IHY effectively enhances radiation capture and improves radiation utilization. Additionally, the net profit for IHY was higher than that for HY, ILP, and LP by 8%, 11%, and 88%, respectively. Considering the high grain yield, high RUE and high economic benefits, we recommend IHY as the agronomic management practice in the target region, although further study of improvements in pre-anthesis RUE is required.
地上生物量的增加取决于冠层截获的光合有效辐射（IPAR）的增强、辐射利用效率（RUE）的提高或两者兼而有之。我们研究了优化的农艺管理措施是否以及如何促进IPAR和RUE。在两个小麦（L.）生长季节中，比较了四种综合农艺管理处理，即当地传统做法（LP）、改良当地传统做法（ILP）、高产农艺管理（HY）和改良高产农艺管理（IHY）。与HY相比，IHY获得的平均籽粒产量为96%，分别比ILP和LP高7%和23%。HY和IHY均持续支持较大的叶面积指数和IPAR分数，从而增加了总IPAR。处理HY在抽穗前的RUE增加，表现为抽穗期较高的比叶氮含量和全株氮营养指数。由于抽穗前最高的IPAR和RUE，HY获得了最高的抽穗前地上生物量。随着冠层表观光合速率的提高，IHY由于其抽穗后较高的IPAR和RUE而产生了较高的抽穗后地上生物量。处理IHY的总IPAR略低，但总RUE和收获指数相似，因此相对于HY，籽粒产量略低。这些结果表明，IHY下使用的优化农艺管理措施有效地增强了辐射捕获并提高了辐射利用率。此外，IHY的净利润分别比HY、ILP和LP高8%、11%和88%。考虑到高籽粒产量、高RUE和高经济效益，我们推荐IHY作为目标地区的农艺管理措施，尽管需要进一步研究提高抽穗前RUE的方法。
