Abstract: This article aims to explore the control methods of sweetpotato storage and provide a theoretical basis for regulating sweetpotato storage.Pre-production regulation is an important part of sweetpotato storage regulation, and fertilization is one of the important means of pre-production regulation. This study starts with fertilizer and uses two varieties of Shangshu 19 and Xinxiang as experimental materials. Nitrogen and phosphate fertilizers, and applying different gradients of potassium fertilizer. After uniform harvesting, select sweetpotatoes with the same size and no damage, and store them in a cold storage at 14℃ and 85% humidity. Samples were taken during the storage period of 0, 15, 30, 60, 90 days, and the decay rate, cell wall composition and enzyme activity were measured respectively, so as to explore the effect of different potassium application on the decay rate, cell wall composition and degrading enzymes of sweetpotato. The results of the study showed that the sweetpotatoes with different potassium application rates showed different degrees of decay during storage. Among them, the potassium application rate of Shangshu 19 was 150 kg/ha(Shangshu 19 K₂)and the potassium application rate of Xinxiang was 225 kg/ha(Xinxiang K₃), which had better storability and the lowest rot rate. Respectively, 18.25% and 23.00%, and Shangshu 19 K₂ had a higher cellulose content, which was as high as 80.63 mg/g, the original pectin content of Xinxiang K₃ is significantly higher than other treatments, with an average of up to 1.14%, and β-Gal enzyme activity is significantly lower than other treatments. Applying potassium treatment to sweetpotato can slow down the degradation of sweetpotato cell wall components and improve the ability to maintain the integrity of the cell wall, thereby reducing the rate of decay.

Key words: Sweetpotato, Potash fertilizer, Storage, Cell wall enzymes, Decay rate, Cell wall components

CLC Number: 

• S143.3