The summer temperature is high. There are many reasons why the seedlings are prone to grow up when growing vegetable seedlings. There are many reasons for the lack of light in the seedling bed during the nursery, and the temperature is too high, especially at night, the temperature is too high, the nitrogen and fertilizer are too much, and the density is too high. , transplanting seedlings are not timely.
First, the reason for the summer vegetables
1. The period most likely to occur and cause serious harm is the period from the emergence of the seedlings to the expansion of the cotyledons. The reason for this period is that the seedlings are too dense and the seedlings are overcrowded.
2. After the seedlings were unearthed, they did not cool down in time, causing the epicotyls of the seedlings to elongate excessively.
3. From the cotyledons to the seedlings to the 2 to 3 leaf stage, if it is less than the time seedlings, the seedlings will appear too long due to overcrowding. In addition, in the case of excessive temperature, if not planted in time, it will make the seedlings grow.
4. From the time after the slow planting of the seedlings to the time of planting, if the weather is continuous and rainy, the soil and air humidity in the seedbed are too large, and the nutrient upper nitrogen fertilizer is applied too much, but the management fails to timely ventilate and transmit light, and the crowded seedlings will also make The seedlings are long.
Second, summer vegetables, seedlings, long prevention and control methods
1. The seeding density should not be too large, so as to avoid crowding of seedlings after emergence. For example, solanaceous vegetables generally need to build 2 to 3 square meters of seedbed per acre of field, sowing 15 to 25 grams of seeds, about 30% of the seedlings are unearthed and the cover of the seedbed is removed in time.
2. Time seedlings, fake plants and colonization. After emergence, the solanaceous vegetables should be in time seedlings. Generally, the seedlings should be planted 2 to 3 times. When the seedlings grow to 2 leaves and 1 heart, they are artificially planted (density control is 120-130 plants/square meter).
3. Strengthen ventilation and light, control temperature and humidity. Ventilation should be carried out after the seedlings are unearthed until the time of the pseudo-planting, and after the slow-planting of the seedlings and before the planting, to reduce the temperature and humidity and control the excessive growth of the seedlings.
4. Reasonable management of fertilizer and water. When formulating nutrient soil, the amount of phosphorus and potassium fertilizer should be increased to control the amount of nitrogen fertilizer. The watering amount and fertilization are strictly controlled in the seedbed, and the nitrogen fertilizer should not be applied when the topdressing is required.
5. Discharge the seedlings in time. About 20 days before the value of the solanaceous vegetables and melons, the seedlings often appear overcrowded. At this time, the seedlings should be properly moved to separate the seedlings and expand the living space of the individual plants.
6. The drug control is long. Once the emergence of the seedlings, in addition to the above measures, it can also be sprayed with 0.2% Bordeaux mixture or with 50% chlormequat 2000~2500 times.
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