As the saying goes, “Seven points of seedlings and three points of the tube†shows the importance of seedlings. The quality of the seedlings not only affects the growth of the plants, but also has a great influence on the pest resistance of the plants during the growth period. Therefore, the cultivation of disease-free and robust seedlings is the first step in the high yield of vegetables, and it is also the key. One step. At this time, when vegetables are grown in the suburbs of Beijing, what problems farmers should pay attention to and how to ensure the production of healthy and disease-free seedlings are introduced here for farmers.
Variety selection. In view of the serious diseases and insect pests in the early spring in the area, disease-resistant varieties should be selected. In addition, the seedlings in the early spring are in the low temperature period in winter. Therefore, it is necessary to select varieties with low temperature resistance and good early maturity.
Seed treatment. Seeds of cucumber can be germinated by soaking in warm water of 50°C-55°C for 30 minutes, or seedlings of 4 ml can be suspended with 2.5% fludioxonil, and 1 kg of cucumber seeds can be quickly mixed with water to prevent disease transmission.
Shelter disinfection. Including the surface of the greenhouse disinfection and bed soil disinfection.
(1) The disinfection of the surface of the greenhouse can be fumigated with horseradish fumigant or ozone or sulfur or 20% Pythium chlorothalonil.
(2) Soil disinfection of seedbed can be driped with 20% horseradishine water emulsion, or even after the whole crop is fertilized and watered, the seedlings can be evenly sprayed with 30% Mycophenolate Wettable Powder 600 times or 50% Carbendazim Wettable Powder 800 times. . Can also be used to cultivate seedlings, with 50% carbendazim per square meter or 30% mildew wettable powder 8 grams, mixed with the appropriate amount of fine soil, using conventional Yangshuo seedlings to take good medicine soil 1/3 Sprinkle on the surface of the bed or in the sowing ditch, and sprinkle the remaining 2/3 of the medicine on the seeds that have already been sown. The effect is good, but the surface of the bed should be kept moist to prevent phytotoxicity. If you use a special soil treatment agent, follow the instructions for use.
Nutrition soil preparation. The nursery soil shall be sieved with raw oyster garden soil and decomposed organic fertilizer, and be mixed in a ratio of 7:3. 0.5 kg-1 kg of compound fertilizer should be added per cubic meter. The use of adequately cooked organic fertilizers as base fertilizers will prevent the introduction of pathogenic bacteria in the excreta or the danger of burning seedlings.
grafting. In order to reduce the harm of soil-borne diseases, cucumber, eggplant and other crops can be grafted with rootstocks.
Temperature and humidity control. If there are long-term low temperature and weak light conditions in winter, warming measures should be taken in the nursery shed to prevent freezing seedlings. The ground temperature line can be laid, and the low temperature can be properly increased to promote seed germination and reduce the occurrence of soil-borne diseases. After the seedlings are unearthed, the watering is controlled, the air is released in time, the humidity of the seedbed is lowered, and the suitable temperature and humidity suitable for the growth and development of the seedlings are created.
Points seedlings. Choose to be carried out on a sunny morning, avoid seedlings as much as possible when selecting seedlings, select disease-free strong seedlings, eliminate weak seedlings, diseased seedlings, and deformed seedlings. One week before planting, move the plastic nutrient cartridges or plugs to suppress the growth potential of the seedlings and stop the low temperature hardening.
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