Abstract:

In order to explore the effect of different planting periods and different densities on the prevention and control of tomato virus disease in solar greenhouse, and provide a theoretical basis for the efficient use of light and heat resources and stubble arrangement of autumn tomato, different planting period and density tests were designed. The results showed that the incidence and disease index of tomato virus disease in T3 and T4 treatments were significantly reduced, and the prevention and control effects were 74.57% and 92.75%, respectively. The incidence of viral disease in T2 treatment was 25.52 percentage points lower than that in T1 treatment, and the incidence of viral disease in T4 treatment was 13.33 percentage points lower than that in T3 treatment. SPAD value, nitrogen content and net photosynthetic rate were higher in T4 treatment. The yield of T4 treatment was significantly higher than that of other treatments, and the yield of T2, T3 and T4 was 47.05%, 63.50% and 76.34% higher than that of T1 treatment, respectively. Therefore, planting in Hotan Area of Xinjiang to avoid the high temperature and drought period in August can effectively reduce the occurrence of virus disease. In order to ensure that tomatoes in autumn and winter can be harvested in December, the number of remaining fruits should be reduced and the density should be increased to achieve the purpose of increasing yield.

Key words: tomato, planting period, planting density, virus disease, prevention and control effect