In the recent period, the unstable temperature and prolonged cold weather have had a great impact on vegetable growth and nursery. Therefore, vegetable farmers should take active actions and adopt effective technological defense measures to deal with the effects of cold weather on vegetables.
The effects of low temperature on seedlings are mainly due to lack of light, low ground temperature, slow emergence of vegetables, weak growth, and heavy damping-off; the main impacts on transplanting and colonization are the delay of planting period, prolonged period of seedling growth, and the process of growth and development. The impact of the main performance is that the growth potential is weak, and flowering, fruit setting, and the time to market are all postponed. When the cold injury is severe, the plants are directly frozen to death.
In the early spring, nursery should be prepared for cold protection as soon as possible according to the changes in the weather. Films and grasshoppers should be prepared in advance. Fill the film in time before the low-temperature cold weather, and take a small shed to keep warm. Seedlings can be sprayed with 0.04% Yunda-120 (Alizarinactone) +0.3% Potassium Dihydrogen Phosphate, or a small amount of water, in the sunny days before the low-temperature cold weather suddenly occurs. It is obvious that the cold resistance of the seedlings is improved. Effect. When the weather improves, fertilizers and seedlings shall be applied in a timely manner to strengthen the management of fertilizer and water in the seedling stage and comprehensive prevention of pests and diseases. Before seedling colonization, low-temperature hardening seedlings are used to improve the resistance, cold resistance and disease resistance of the vegetables themselves. Solanaceous vegetables were controlled 5 to 7 days before planting, and the daytime temperature was controlled between 22°C and 26°C during the sunny day and 8°C and 12°C during the night.
Transplanting vegetables in early spring should be timely covered with plastic film, take a small shed to keep warm. Pay attention to the weather forecast and spray antifreeze on the leaves before cold freezing damage. The formula is to add 50 grams of urea, potassium dihydrogen phosphate and brown sugar for every 15 kilograms of water. After mixing, spray on the back of the leaves every 5-7 days. Spray once.
Before the occurrence of low temperature damage, the soil is cultivated with cultivator, and the depth of soil 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 damage, 100-150 kilograms of rice straw per acre was evenly spread over the vegetable pods and vegetables to reduce the freezing damage.
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