In February, the outside weather gradually warmed up and the temperature gradually increased. In the greenhouse, cucumbers began to thrive, and the frequency of watering and fertilization increased. The sudden low temperature during this period can easily cause chilling or freezing injury.
The reasons for cold injury and cold injury in this period are two aspects: First, the cold resistance of the plant declines. Due to the vigorous growth of plants and the increase of water and fertilizer in human management, the cold resistance of the plants decreased significantly. Therefore, there are some anomalies that have not died of freezing in winter and frozen in spring. This is the reason for this. The second is the drop in temperature. There is still a large cold current in northern China in February. The low temperature caused is enough to cause cold damage and cold damage to cucumbers in greenhouses. Most meteorological conditions resulting from cold damage and cold damage are: 5-7 days of continuous rainy days, insufficient sunshine, low temperature in the greenhouse, and sudden low temperatures, causing freezing and cold damage. The main cause of cold injury and frost damage in early spring is the reduction of cold resistance of plants, and the external low temperature is the secondary cause. The cold damage of this period often stops the growth of plants for several days, and the yield is reduced in the short term. Freezing damage will kill some plants.
Measures to prevent cold and freezing of greenhouse cucumbers are: to improve the greenhouse insulation performance, strengthen the management of thermal insulation; to exercise the plants in due course, the temperature at night should be kept at a low level of 15 °C; spring, water and fertilizer should be gradually increased, in the application In the case of nitrogen fertilizer, appropriate phosphorus and potassium fertilizers should still be maintained. In addition, antifreeze sprays can also be used. After the domestic antifreeze spray, it can improve the resistance of cucumber to low temperature 1-2 °C. The use of 0.2% potassium dihydrogen phosphate 0.2% solution out of root dressing 2-3 times also has the effect of increasing the cucumber's ability to resist low temperatures. The use of cold-resistant varieties such as Jinchun No. 3 can also achieve good anti-freeze chilling effects. After freezing and chilling damage occurs, in order to reduce the loss, natural alizarin-shuofeng 481 should be sprayed once. 481 can promote the photosynthesis of the leaves, make the leaves more nutritious, repair damaged tissue, promote growth and reduce losses.
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