Effects of Circular Planting with Different Densities on Stem and Leaf Growth,Yield Formation and Commodity Traits of Fresh-Eating Purple Sweet Potato

Chen Lulu; Sun Zhe; Tian Changgeng; Liu Shanggang; Qin Huawei; Zhan Yu; Zheng Jianli

doi:10.14083/j.issn.1001-4942.2025.02.006

Abstract：In order to explore and optimize the planting method and planting density for purple sweet po-tato,and fully utilize the ridge space,the experiment was carried out with the fresh-eating purple sweet potato varieties Taizishu 1 and Yanzishu 3 as experimental materials,and the local conventional planting method(medium-density oblique planting)as the control(CK).Three treatments of high-density circular planting(T1),medium-density circular planting(T2)and low-density circular planting(T3)were set to explore the effects of circular planting with different densities on stem and leaf growth,yield formation and commodity quality of fresh-eating purple sweet potato.The results showed that the vine length and stem diameter de-creased with the increase of planting density,and the coordination between stem and leaf growth and root tuber growth was better under T2 treatment.The dry weight and dry matter distribution rate of T2 treatment were sig-nificantly higher than those of the other treatments.The single tuber weight of the circular planting treatments was significantly reduced compared to CK,and decreased with the increase of planting density.The fresh tuber yield,dry tuber yield and harvest index(except for Yanzishu 3)of different treatments showed T2＞CK＞T3＞T1.Under the circular planting treatments,the rate of large potatoes was lower than that under CK,while that of medium potatoes was higher;the rate of commercial tuber decreased with the increase of planting density,and that in T2 and T3 treatments were significantly higher than that in T1 and CK treatments;the rate of medium tubers in T2 treatment was significantly higher than that in the other treatments.In conclusion,un-der the treatment of T2 circular planting with 52 500 plants per hectare,the growth of aboveground and under-ground parts was coordinated,the dry matter distribution rate of root tuber was significantly improved,the yield of fresh and dry tubers were the highest,and the commodity quality of tubers was the best.This conclu-sion could provide data reference for fresh-eating purple sweet potato production.