Harm and Control techniques of continuous cropping of Strawberry in greenhouse

1. The harm of continuous cropping of strawberries in greenhouse 1.1 leads to the long-term accumulation of pathogenic microorganisms and continuous planting of strawberries on the same plot, which will cause obvious changes in the microbial community in the soil, and suddenly nematodes and pathogens multiply in large numbers, resulting in the occurrence of diseases and insect pests. 1.2 resulting in strawberry nutrient balance imbalance after greenhouse strawberry continuous cropping, the harmful salts in the soil surface gradually accumulated and the nutrients easily absorbed by strawberries decreased year by year, which led to the imbalance of nutrient balance around strawberry rhizosphere and reduced strawberry yield due to lack of nutrients. 1.3 lead to the accumulation of harmful exudates from strawberry roots in greenhouse strawberry roots often secrete harmful substances in the normal process of physiological metabolism, and continuous cropping causes harmful substances to accumulate year by year, which hinders the growth and development of strawberries, thus leading to stunting and affecting the yield and quality of strawberries. 2. The key technology of preventing and controlling the harm of continuous cropping of strawberry in greenhouse 2.1 the rotation system advocates planting every two to three years, and the rational rotation and stubble planting of strawberry and other crops can effectively alleviate the harm of pathogens in soil continuous cropping. 2.2 replace the topsoil in the greenhouse where strawberries were planted in the previous crop, dig out the 30 cm thick topsoil, and then replace it with aseptic new soil, which has a good control effect on effectively preventing and overcoming the diseases caused by strawberry continuous cropping. 2.3 strengthen the application of organic fertilizer after strawberry harvest, apply a large amount of organic fertilizer timely, and then turn it deeply, which has a good effect on improving the soil physical and chemical properties and soil fertility in the greenhouse. 2.4 the use of sunlight high temperature disinfection in July and August every year when the sun exposure is sufficient, the radiation energy is large, and the temperature is high, the use of solar energy for disinfection treatment, the effect is better. 2.5 Application of chemical fumigation soil disinfection with soil disinfectant can prevent the spread of soil germs. At present, the widely used soil disinfectants are dimethyl, methyl bromide fumigant and so on. In the application of soil disinfectants, it should be noted that a single disinfectant can not be used for a long time, otherwise, it will lead to drug resistance to soil diseases and greatly reduce the efficacy of disinfectants.