Recently, the temperature is unstable and the long-term low temperature has a great impact on vegetable growth and seedling growth. Therefore, vegetable farmers should take active actions and take effective defense measures to deal with the effects of cold weather on vegetables.
The effects of low temperature on seedlings are mainly caused by insufficient light and low ground temperature. Slow emergence and weak growth of vegetables and heavier stagnation diseases; the effects on transplanting and planting are mainly due to delayed planting period and prolonged seedling stage; The impact is mainly due to weak growth, and flowering, fruit setting and market launch will be postponed. When the freezing damage is serious, the plants are directly frozen.
1. Defense, remedial technical measures. In the early spring, it is necessary to prepare for the cold prevention according to the changes in the weather, and prepare the film and grasshopper in advance. Cover the film in time before the cold weather is coming, and keep the small arch shed to keep warm. Seedlings may be sprayed with 0.04% Yunda-120 (albuylide lactone) + 0.3% potassium dihydrogen phosphate or 1 time of small water on a sunny day before the cold weather is sudden, to improve the cold resistance of the seedlings. Obvious effect. When the weather improves, timely topdressing, uniform seedlings, strengthen the management of fertilizer and water in the seedling stage and comprehensive prevention and control of pests and diseases. The seedlings should be subjected to low-temperature refining before planting. The solanaceous vegetables should be controlled for 5-7 days before planting. The daytime temperature should be controlled at 22~26°C, and the nighttime control should be 8～12°C. The low-temperature refining can improve the resistance of the vegetables themselves. Cold resistance, disease resistance, etc. In the early spring, the transplanting of vegetables should be covered with mulch film in time, and the small arch shed should be kept warm. Pay attention to the weather forecast, spray antifreeze on the foliar surface before the cold damage, formula is 50 grams of urea, potassium dihydrogen phosphate and brown sugar per 15 kg of water. Stir well and spray on the back of the vegetable leaves every 5-7 days. Spray once.
2. Prevention of low temperature freezing damage of open vegetables. Before the occurrence of low temperature freezing damage, combined with cultivating, the soil depth is 5-10 cm, which can loosen the soil, increase the soil temperature and protect the roots. In the afternoon before the onset of low temperature freezing, 100-150 kilograms of straw per acre is evenly covered on vegetable rafts and vegetables to reduce frost damage.
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