Effects of different planting densities and fertilizer configurations on photosynthetic characteristics,yield and quality of vegetabley sweet potato
To clarify the effects of different cultivation densities and nitrogen fertilizer application rates on the production of vegetabley sweet potato in the Huang Huai region,this experiment used Eshu 10 as the test material and adopted a split zone experimental design.The main zone was the cultivation density(180000,210000,240000 plants·hm-2),and the sub zone was the nitrogen fertilizer application rate(800,1200,1600,2000 kg·hm-2).The study investigated the interaction between nitrogen fertilizer application rate and planting density on the photosynthetic characteristics,yield,and quality of vegetabley sweet potato.The results showed that nitrogen fertilizer application had significant impact on the quality of vegetabley sweet potato,while planting density had highly significant effect on the growth,yield,photosynthesis,and nitrogen absorption efficiency of leaf sweet potato stem tips,but had no significant effect on stem tip quality.The thickness and number of stem tips,total stem tip yield,functional leaf area,photosynthetic characteristics,and nitrogen absorption effi-ciency were significantly affected by the interaction effect.Among them,the D2N3 treatment(density 210000 plants·hm-2,nitrogen fertilizer 1600 kg·hm-2)and the D2N4 treatment(density 210000 plants·hm-2,nitrogen fertilizer 2000 kg·hm-2) had higher soluble protein content and stem tip yield,which were 83.68 mg·g-1,41127.08 kg·hm-2 and 86.36 mg·g-1,41715.03 kg·hm-2,respectively,with no significant difference between the two treatments.The nitrate content was 25.58 and 27.22 mg·kg-1,respectively,with significant differences.The soluble sugar content,vitamin C content,and nitrogen absorp-tion efficiency of D2N3 treatment were significantly higher than those of other treatments.According to comprehensive analysis,the planting mode with a nitrogen fertilizer application of 1600 kg·hm-2 and a density of 210000 plants·hm-2 can be promoted as the optimal configuration for vegetabley sweet potato production in the Huang Huai region.
万方数据
维普
