Vegetables grown in high temperature season include celery, cabbage, broccoli, broccoli, Chinese cabbage, mustard, lettuce and autumn greenhouses, and solanaceae in greenhouse cultivation. These vegetable seedlings often cause bad seeds, rotten roots, dead seedlings, seedlings, and leggy due to high temperature, heavy rain, exposure to sunlight, and pests and diseases. After many years of production practice, the author believes that in addition to the dry and well-performed seedlings in the high-temperature season, the plot should not be planted as a nursery for three years.
First, anti-high temperature. Lettuce and celery are difficult to germinate under high temperature. Seeds can be soaked for 6 hours and then wrapped with wet gauze and placed 10 centimeters from the surface of the well or placed in the refrigerator at low temperature. Celery is 3-6°C for 48 hours. Lettuce is 72 hours at 8°C can promote germination and increase germination rate. The temperature is too high at noon on sunny days in summer and should not be sown. After 4 o'clock in the afternoon or on cloudy days, sowing should be selected. After sowing, straw or straw curtains are used to cover the seedbeds, and straw awnings, shade nets, and non-woven fabrics can also be used to build shading sheds to prevent burning of young sprouts in the hot sun.
Second, prevent storms. Frequent rainstorms in the summer can cause soil compaction, which is not conducive to seed germination and unearthing. The following measures can be taken: (1) choose a high-lying, dry plot to build a seedbed; (2) choose a sandy loam for seedlings in areas with frequent rainstorms; (3) smooth drainage around the seedbed; and (4) use temporary cover to mitigate heavy rain hazards. After the rain should be shallow cultivator, small earth, righting seedlings.
Third, prevent drought. After doing a good job of seedbeds, first planting foot water and then sowing, or after the site preparation to make full water, sowing. Cover the film after sowing and immediately lift the film after emergence. Pour water in the morning and in the evening and sow it. The method of seeding seedlings by instant opening is used. The method is: after the first hole is sown, it will not cover the soil temporarily. When digging the second hole, the wet soil excavated will be used as the cover for the first hole.
Fourth, anti-adults. High temperature season seedlings, easy to grow, should be early and late ground watering with a watering can, timely sub-miao seedlings, expand seedlings nutritional area. Seedlings are sprayed with 800 times solution of ethephon or sprayed with 1000 times of paclobutrazol at the leaves of 2-4; greenhouse seedlings can also be sprayed with 1000 times of solution of chlormequat. This can prevent slender stalks, thin stems and leaves, make the seedling thick, thick green leaves, thick leaves, and promote flower bud differentiation.
Fifth, pest prevention. High temperature season vegetable nursery susceptible virus disease. The following measures can be taken to prevent pests: (1) Select antiviral strains; (2) Soak mustard and tomato seeds, soak 10% trisodium phosphate 1,000 times for 10 minutes, then rinse with clean water or inoculate tomato with attenuated vaccine; (3) Use nylon Mesh smash prevention; (4) avoid silver with gray film; (5) promptly eliminate smashing.
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