Key points of autumn cultivation techniques for greenhouse tomato in Hebei area
In autumn, the greenhouse planting area of ​​tomato in Hebei area is broad, and at this time, the growth of tomato in the early stage is in high temperature and rainy weather. The occurrence of pests and diseases is frequent and the temperature will decrease in the late growth stage. Therefore, farmers need to do a good job in pest control and cold insulation. . First , variety selection and planting time After the autumn extension, tomato production should be selected for varieties with strong disease resistance, early maturity, high yield and storage resistance, such as Jinpeng No. 10, Tianma 54, Modified Ruiwu, Opel No.3, etc. After the autumn shed in the greenhouse, the sowing date of the tomato is determined according to the change of local temperature. Generally, the southern part of the area is suitable for mid-July.   Second, the way of nursery Tomato cultivation in greenhouses after autumn extension should be carried out using tray substrate. The seedlings are first planted in the 288-hole tray. When the seedlings are 2~3 leaves, the seedlings are transplanted into the 72-hole tray. The seedlings grow to 5~6 leaves, the leaves are dark green, the plants are robust and disease-free, and the calendar seedling age is 25 days. Colonization when left and right. Tomato seedlings are in the high temperature season. Shading nets can be used for shading and seedlings to reduce disease and cultivate strong seedlings. Third, soil preparation and fertilization Before the planting, it is necessary to carry out pastoral cleaning and fine land preparation. Apply sufficient fertilizer to the base fertilizer, about 1 500 kg of cooked chicken manure or cow dung, and 75 kg of potassium sulfate type compound fertilizer (15-15-15). Fourth, colonization and post-plant management 1, colonization. Autumn tomatoes can be cultivated by cultivating or ridged. Planting density: Generally cultivated infinitely growing varieties plant about 4 000 per acre. It is best to choose to plant in cloudy or evening, and timely root water to reduce the seedlings. 2. Management after planting. After the planting of the greenhouse in the greenhouse, the first step is to strengthen the ventilation. The conditional sunshade net and wet curtain can be used to cool down. Secondly, the cultivating loose soil should be carried out in time. If the plant is long, the plant should be sprayed with chlormequat; The fruit-bearing hormone smear the flower stalk to increase the fruit setting rate, timely pruning, snoring, and tying the vine. Generally, the single-drying branch is used to leave 2~3 spikes and then the heart is picked; the fourth is to pay attention to the heat preservation in the later period, and the outside temperature begins to decrease after mid-October. The cover is added in time; the fifth is to strengthen the management of fertilizer and water. When the first ear is seated, the water and fertilizer management will be strengthened. Generally, 8~10 kg of urea or 15~20 kg of high-nitrogen and high-potassium compound fertilizer will be applied in the middle and later stages. Fertilizer or foliar spray. 3. Pest control. The pests that are controlled by Qiuyan tomato are aphids, whitefly, and cotton bollworm. They can be controlled by imidacloprid, acetamiprid, and acesulfame. The disease is mainly used to prevent and treat viral diseases, and the disease is early, using phytopathology, virus A, and high. Potassium manganate, Sterling, etc. are used for prevention and control. In the late stage of autumn tomato development, leaf mold, early blight, late blight and other diseases are heavier. In the early stage of the disease, mancozeb, chlorothalonil, chlorhexidine, metalaxyl manganese zinc can be used. , anti-virus cockroaches, methyl thiophanate and other chemical control, every 7 to 10 d once, continuous prevention 2 to 3 times. V. Harvesting and storage After the color change of the autumn tomato fruit in the greenhouse, it should be harvested and listed one after another. When the temperature in the greenhouse drops to 2 °C, it should be harvested in time for storage, and the fruit will be listed after the color change to red. The above is the key points of autumn cultivation techniques for greenhouse tomatoes in Hebei area. If you want to know more about vegetable cultivation, please pay attention to Hui Nong School!
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