The vegetables that are raised in the hot season are mainly celery, cabbage, broccoli, broccoli, Chinese cabbage, mustard, lettuce, and autumn greenhouses and greenhouses. These vegetable seedlings are often caused by high temperature, heavy rain, exposure to sun, pests and diseases, rotten seeds, dead roots, dead seedlings, uneven emergence, and longevity. In order to ensure that Miao Qi Miao and Zhuang, the following "five preventions" should be noted:
1. Anti-high temperature. It is difficult to germinate lettuce and celery at high temperature. Seeds can be soaked for 8 hours, then wrapped in wet gauze and placed in the well 10 cm away from the water surface, or placed in the refrigerator for low temperature treatment: celery is immersed for 3 hours at 3-6 °C for 48 hours. Lettuce is Soaking at 8 ° C for 72 hours can promote germination and increase germination rate. In the summer sunny days, the temperature is too high at noon, it is not suitable for sowing. It should be planted after 4 pm or on cloudy days. After sowing, the bed is covered with straw or straw curtains, and shade shelters can be constructed with straw curtains, shade nets, non-woven fabrics, etc., or seedlings can be grown under high crops.
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2. Anti-storm. Heavy rains in the summer often cause the soil to be compacted, which is not conducive to seed germination. It is necessary to choose a high-dry land to build a seedbed; it is advisable to choose sand loam for seedlings in areas affected by heavy rain; drainage around the seedbed should be smooth; temporary cover should be used to mitigate the danger of heavy rain. After the rain, shallow cultivating, small cultivating soil, and Fuzheng seedlings should be used.
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3. Anti-drought. After planting the foot water in the seedbed, sowing, or fully filling the water and then planting the soil, sowing; sowing after covering the soil, or covering the cover to protect the soil; the seedbed is poured into the water early and late. By sowing, the seedlings are seeded on the spot. The first hole is not covered with soil after the first hole. When the second hole is dug, the wet soil dug out will be used as the cover of the first hole.
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4. Prevention of pests and diseases. Select disease-resistant varieties to raise seedlings, use 40% pentachloronitrobenzene powder for 1.5 to 2 kg for soil disinfection and disease prevention. Use 40% of 40% methyl isoflavone to mix 5 kg of bran, and apply underground pests when planting the seedbed. High temperature season vegetable seedling susceptible virus disease, soaking seeds with 10% trisodium phosphate or 0.1% potassium permanganate solution for 15-20 minutes, washing and germination; seeding under high stalk crops, shading and cooling; using insect net or cockroach It can prevent the transmission of viral diseases such as aphids, thrips and spider mites. Manual weeding in time.
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5. Anti-mite seedlings are long. Breeding in high temperature seasons, it is easy to grow up, should be sprayed with watering cans in the morning and evening, avoid flooding. And time seedlings and seedlings, try to expand the nutritional area of ​​the seedlings. The seedlings spray 800 times liquid ethephon or spray 1000 times solution of paclobutrazol at 2 to 4 leaves; the greenhouse vegetable seedlings can also spray 1000 times liquid of chlormequat, which can prevent the internodes from being slender and thin, and the stems and leaves are weak. The seedlings are thick and strong, the leaves are dark green, the leaves are thickened, and the flower buds are promoted.
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