Abstract:

To effectively prevent and control the rot disease at the base of sweet potato stem, thus promote the sustainable and healthy production of sweet potato in mountainous areas, the effects of treating soil with lime nitrogen before cutting and spraying base stem with tebuconazole after cutting on the disease were studied. The results showed that the effect of soil treated with lime nitrogen + soaking and spraying tebuconazole after cutting (GSS2) was 75.34% higher than that of the control (GSS5); the soil treated with lime nitrogen + soaking tebuconazole after cutting (GSS3) had only 30.43% increase in disease control effect; the disease rate of sweet potato spraying with tebuconazole after cutting (GSS2) was 6.85% lower than those spraying with tebuconazole at the initial occurrence of the disease (GSS1). Soaking base stem with tebuconazole alone (GSS5) had no effect on disease control. The effect of GSS4 was 52.16% higher than that of the control (GSS5). This research indicates that the application of lime nitrogen to soil could reduce the incidence of the rot disease at the base of sweet potato stem, thereby increasing the yield of sweet potato. Moreover, the soil treated with lime nitrogen also has significant effect on disease control and yield increase in the next year. Applying lime nitrogen as soil disinfection could prevent diseases and increase the yield of fresh sweet potato, and has great significance to promote the sustainable production of sweet potato in mountainous areas.

Key words: Lime Nitrogen, Sweet Potato, Soil Disinfection, Rot Disease at the Base of Sweet Potato Stem, Experiment, Effect