Ge X L, Chen Y B, Wang Y, Wang B C, Chao Q, Yu Y, Gong X J, Hao Y B, Li L, Jiang Y B, Lv G Y, Qian C R, Jiang C D
College of Agriculture, Inner Mongolia University for Nationalities, 028042 Tongliao, China.
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, China.
Photosynthetica. 2022 Sep 6;60(3):465-475. doi: 10.32615/ps.2022.032. eCollection 2022.
Wide-narrow row maize planting patterns are a popular way to enhance maize yield improving canopy PAR. To further optimize canopy PAR, we designed an improved wide-narrow row planting pattern (R2) based on the principle of the shortest projection length and the longest illumination of objects on the ground. Compared to the traditional wide-narrow row planting pattern (R1), maize yield increased by about 10% in R2. R2 maize had higher PAR, leaf area index, chlorophyll content, and photosynthetic rates than maize grown in R1. Moreover, compared to maize leaves in R1, the carbon assimilation enzymatic activities were also significantly higher in R2. The higher carbon assimilation enzymatic activity in R2 could account for the increased photosynthetic rate. Thus, the improved wide-narrow row planting pattern could improve photosynthetic performance by enhancing the PAR of the plant canopy, which further promotes the ear number and yield in northeast China.
宽窄行玉米种植模式是提高玉米产量、改善冠层光合有效辐射（PAR）的一种常用方法。为了进一步优化冠层PAR，我们基于物体在地面上投影长度最短和光照时间最长的原理，设计了一种改进的宽窄行种植模式（R2）。与传统宽窄行种植模式（R1）相比，R2模式下玉米产量提高了约10%。R2模式下的玉米比R1模式下的玉米具有更高的PAR、叶面积指数、叶绿素含量和光合速率。此外，与R1模式下的玉米叶片相比，R2模式下的碳同化酶活性也显著更高。R2模式下较高的碳同化酶活性可以解释光合速率的提高。因此，改进后的宽窄行种植模式可以通过提高植物冠层的PAR来改善光合性能，进而提高中国东北地区的玉米穗数和产量。
