In winter and spring vegetable seedlings, abnormal conditions often occur due to weather changes and improper management. The root seedlings are caused by the humidity of the seedbed and the low temperature. Control measures: 1 Select a well-perforated soil as a seedbed and try to increase the temperature. 2 Use geothermal lines to raise seedlings so that the seedbed temperature is maintained at 20 to 25°C during the day and 15°C at night. 3 Control watering. 4 Once roots occur, they must be promptly ventilated and drained, as well as fine dry soil and ash. The long seedlings are caused by high sowing volume and high temperature and high humidity after emergence. Preventive measures: 1 Strictly control the amount of sowing. 2 When the seedlings grow crowded, time and seedlings are required. 3 Increase the row spacing when seedlings are planted to prevent excessive shading. 4 Increase lighting as much as possible. Even on cloudy days, make sure that the seedlings are exposed. 5 Control watering. 6 foliar spray 0.2% glutinous rice liquid fertilizer plus 0.2% to 0.3% potassium dihydrogen phosphate, to promote seedlings turn strong. Aging seedlings are caused by seedlings or seedlings that take too long. Prevention measures: 1 Strictly control the age of seedlings, and the length of seedlings should be appropriate. 2 seedlings should not be too long when the low temperature, to prevent long-term drought caused by seedlings aging. Seedlings best use temperature control method of water control. 3 For the aging seedlings, spray 10-30ppm gibberellin per 500 square meters of seedlings per square meter, add 500 times gexin liquid fertilizer or 300-500 times potassium dihydrogen phosphate to stimulate seedling growth. Frozen seedlings are caused by a low seedbed temperature. Control measures: 1 Improve the means of raising seedlings, artificial temperature control seedlings, such as electric hotbed nursery. 2 warm antifreeze. Before the arrival of the cold current, strengthen the night insulation, such as thick straw, covered paper, covered with a small arch and so on. Keep as dry as possible to prevent rain and snow from getting wet. Take warming measures if necessary, such as furnace fire. 3 properly control watering, reasonable increase in phosphate fertilizer, improve seedlings resistance to cold. 4 Spray the nutrient solution on the frozen seedlings. Nutrient solution formula: 30 ml of glutinous liquid fertilizer, plus 250 grams of sugar, 1 g of gibberellin, 0.3 g of rooting powder, and 15 kg of water. The diseased seedlings are caused by excessive application of pesticides, high concentrations, or premature seedbeds. Control measures: 1 scientific and rational use of drugs. 2 Keep the seedbed moist before use. 3 If there has been a phytotoxicity, spray water or spray to ease the drug promptly, such as thiabendazole, Fu Mei Kun spray 0.2% zinc sulfate solution; dimethoate spray 0.2% borax or boric acid solution; paclobutrazol spray damage 0.05 % Gibberellin. The wilting seedlings are caused by all the unraveling after the rain has suddenly turned cloudy. Prevention and control measures: In case of a sudden turn of cloudy days, the seedlings should be gradually exposed to light. Do not immediately uncover all the coverings. Remove them in batches and gradually increase the light. If the seedlings are found to be wilting soon after the cover is uncovered, cover them immediately and wait until the seedlings return to normal before they are exposed. Do not water the wilt seedlings. Wearing a hat seedling is caused by the seedbed being too dry and covering the earth. Control measures: 1 The bottom water of the seedbed should be sufficient. 2 The thickness of the cover soil is uniform and appropriate. Such as pepper, eggplant thickness 1 cm, 1.5 cm cucumber. 3 Before emergence, the bed surface was covered with plastic film to keep the soil moist. 4 When the seedlings are in use, they can be sprayed with water. After the seed shells are wetted, use a brush to gently remove the shells.
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