First, the cause of cold and freezing injury 1, low temperature and low temperature duration. The lower the temperature drop, the longer the low temperature time, the colder and colder the cucumber, the heavier, and the lighter. 2, abrupt cooling and weather conditions after the victim. If the temperature gradually decreases, cold and freezing injury will be light. If it encounters fine weather after a low temperature, it will increase cold and freezing damage. Conversely, after a low temperature and in cloudy weather, the temperature will gradually rise, which will help the affected cucumber gradually return to normal physiological activity. Cold and freezing injury will be lighter. Second, cold and freezing damage prevention measures 1, using grafted seedlings. According to the survey, the wilting rate of whole plants in the same greenhouse was more than 10%, while that of grafted plants was only about 1%. 2, appropriate water fertilization. Before the beginning of spring, cucumbers in greenhouses are vulnerable to cold currents, and nitrogen fertilizers should be reduced. Watering should be controlled at the same time so as to avoid causing leggy. The survey found that leggy plants suffer from cold and freezing damage. 3, smoke and cold. When the cold current comes, some straw smoke every 2 hours, can reduce the cold, freezing injury. However, the amount of smoke should not be too large. Otherwise it will smoke the plants. 4, to avoid rapid temperature rise after a low temperature. After the cucumber suffers from the continuous low temperature harm, do not immediately raise the grass toad when it is sunny, but must gradually open the grasshopper, avoid the temperature rise sharply. Third, the cold and freezing damage remedies 1. Strengthen fertilizer and water management to prevent premature aging of leaves. After the stems have dried up, fertilizer and water management should be strengthened to extend the photosynthetic function of the main leaves. In sunny weather, the room temperature is about 28°C during the day. When the night temperature is not lower than 12°C, the membrane is filled with water once a week, and ammonium bicarbonate is applied once every two weeks for 20 kg per mu. 2, pruning. After normal growth, the nutrition level of the plants was relatively sufficient, and large numbers of lateral and rectal melons were produced. However, the melons on the lateral branches have poor commercial quality and the main vines have a certain length. Therefore, for all the side branches, growth status leaves 1 leaf to 3 leaves (melon) to pick up the heart, in order to form a peak production period of more than one month. jinan Fangqi Sunshine education consulting CO.,LTD. , https://www.fzrehabmarket.com
Cold injury and frost damage prevention technology of cucumber
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