Effects of different topdressing treatments on the yield,quality,and ni-trate accumulation of vegetabley sweet potato
To increase the yield of vegetabley sweet potato in Huanghuai region,improve the quality of stem tips,and clar-ify the application effect and feasibility of reducing nitrogen fertilizer and applying organic fertilizer in the production of vegetabley sweet potato in Huanghuai region,the experiment was designed using Eshu No.10 as the test material,with five treatments including single topdressing with nitrogen fertilizer(CK),single topdressing with organic fertilizer(T1),organic fertilizer+reduced nitrogen fertilizer by 30％(T2),organic fertilizer+reduced nitrogen fertilizer by 20％(T3),and organic fertilizer+reduced nitrogen fertilizer by 20％+microbial agent(T4).The effects of different topdressing treatments on the yield,quality,and nitrate content of vegetabley sweet potato were studied.The results showed that com-pared with CK,different topdressing treatments could increase the total chlorophyll content and antioxidant enzyme activi-ty of leaves,and reduce the nitrate content.Among them,the total sugar,vitamin C,and flavonoid content of leaves in T4 treatment were significantly increased by 17.27％,13.33％,and 17.85％,respectively.The stem tip yield reached 36 917.73 kg·hm-2,which was significantly increased by 19.30％compared with CK.The nitrate content in T4 treatment was the lowest at 455.75 mg·kg-1,which was significantly reduced by 24.59％compared with CK.Correlation analysis showed that SPAD of vegetabley sweet potato was significantly positively correlated with yield,and significantly positively correlated with protein content,vitamin C content,POD activity,and SOD activity,and significantly negatively cor-related with malondialdehyde content.Comprehensive analysis showed that the topdressing mode of nitrogen fertilizer 96 kg·hm-2+organic fertilizer 6000 kg·hm-2+microbial agent 45 kg·hm-2 can effectively improve the quality and yield of sweet potato tips,reduce nitrate accumulation,and can be recommended as a topdressing mode for vegetabley sweet potato in Huanghuai region.
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NSTL
万方数据
