Tarbiat Modares University Journal of Agricultural Science and Technology 1680-7073 27 4 2025 07 01 Photosynthetic Characters of Canopy and Storage Root Yield of Sweet Potato (Ipomoea batatas L.) Grow in Different Soil Compaction 921 933 17059 10.22034/JAST.27.4.921 EN Furong Du State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Agricultural College, Shandong Agricultural University, Tai’an, 271018, Shandong Province, China. Chengcheng Si College of Horticulture, Hainan University, Haikou, 5702258, Hainan Province, China. Yongchen Liu State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Agricultural College, Shandong Agricultural University, Tai’an, 271018, Shandong Province, China. Xiubo Yin Multigrain Department, Shandong Agricultural Technology Extension Station, Jinan, 250100, Shandong Province, China. Wenqing Shi Multigrain Department, Shandong Agricultural Technology Extension Station, Jinan, 250100, Shandong Province, China. Chunyu Shi Multigrain Department, Shandong Agricultural Technology Extension Station, Jinan, 250100, Shandong Province, China. Zhe Sun Tai'an Academy of Agricultural Sciences, Tai’an 271000, Shandong Province, China. Hongjuan Liu State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Agricultural College, Shandong Agricultural University, Tai’an, 271018, Shandong Province, China. Wenjuan Lu Journal Article A field experiments were carried out with two varieties in control, loose, and compacted soil conditions. Then, Canopy Apparent Photosynthesis (CAP), gas exchange parameters, Photochemical reflectance index (PIabs) of the functional leaves, and SR yield were measured, and the relationship between yield and photosynthetic characters was studied as well. Compared with the control, the SR yield was significantly increased in loose soil with an average increase of 27.03~38.74%, but decreased in compacted soil with an average reduction of 17.87~15.92%. Both loosening and compaction treatments increased the Leaf Area Index (LAI), and the increase in the latter was significantly higher than that in the former. Canopy interception rate in loosening treatment was much higher than that of the compacted soil. The CAP showed a similar change in yield, with a strong positive correlation to Storage Root (SR) yield and single storage root weight. Loose soil also improved gas exchange parameters, and PIabs, the reverse was found in compacted soil. Compared to the control, the loose treatment significantly improved economic coefficient and reduced leaf starch content, while the compaction treatment showed the opposite trend. Path analysis revealed that the net Photosynthetic rate (Pn) had the most total effect and higher direct effect on increasing CAP. Therefore, soil compaction primarily regulates SR yield through CAP, with Pn exerting a significant impact on CAP. Enhanced soil compaction led to reduced photosynthate output in functional leaves, resulting in decreased Pn and increased LAI. Consequently, an inappropriate canopy structure with low canopy interception was formed.

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