Effects of Planting Density and EBR Concentration on the Yield and Quality of Sweet Potato
In order to further explore the methods to improve the yield and quality of sweet potato,and provide theoretical parameters for the high-yield cultivation technology of sweet potato in northern China,the impacts of planting density and EBR(24-epibrassinolide)spraying concentration on the yield and quality of sweet potato were studied through the coupling of two factors.The results showed that,under the same planting density,low and high concentrations of EBR were not conducive to the increase of sweet potato yield,SPAD value,Fv/Fm,while high planting density and appropriate concentration of EBR were conducive to the increase of sweet potato yield and photosynthetic characteristics.The planting density was 67 500 plants/ha,and the fresh sweet potato yield was the highest when 150 L/ha of EBR with a concentration of 0.10 mg/L was sprayed.Proper concentration of EBR was conducive to the improvement of the overall quality of sweet potato.Proper increase of cultivation density was conducive to the increase of reducing sugar,protein and starch contents of sweet potato,but would reduce the soluble sugar content.The coupling of appropriate planting density and EBR spraying concentration was beneficial for improving the commercial rates and dry matter contents of sweet potato,but it had no significant impact on the phenotypic traits of sweet potato and had no significant effect on the number of tubers per plant.The main factor restricting the yield of sweet potato was starch content(0.694),followed by reducing sugar content(0.672)and the longest vine length(0.667),while the number of branches had the smallest impact on the yield,and its correlation degree was only 0.511.Moreover,at higher cultivation density and EBR concentration,the yield and quality indicators of sweet potato changed more evenly and stably.
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