Recently, when the author went to the countryside, he discovered that some of the cucumbers planted in greenhouses had a phenomenon of flowering. Symptoms are the growth stagnation of the melons, the tight gathering of the tapers, and the shortening of the internodes near the growing point, that is, small leaves close to the growing point are dense, the small melons appear in each leafhopper, and a large number of female flowers grow and open, resulting in capping, commonly known as flowering. The top has a great influence on the yield of cucumbers. If no effective measures are taken, it will often cause great losses. Here are the reasons for producing cucumber flower topping and its prevention and control methods. First, the cause 1. Root caused by burns. Due to excessive or insufficient organic fertilizer applied during planting, and watering after planting is not timely, the relative water content of the soil is lower than 65%, resulting in an excessively high concentration of soil solution, resulting in rust color or dead in the root tip, causing root absorption. Difficulties produce flower topping. 2. caused by low temperature. When the ground temperature in the greenhouse is lower than 10°C and the soil relative water content is higher than 75%, the growth of cucumber roots is limited, resulting in the rooting of the roots, which causes the flower topping phenomenon; or the night temperature is lower than 10°C, which may cause the foliage Irregular or shrunken, the plants are dwarf and show dystrophic flowers topping. 3 caused by the root cause. In the field operations, such as cultivating and watering, the roots are mechanically damaged, and they fail to recover for a long period of time, causing the plants to absorb nutrients and suppress the appearance of flower topping. 4. Caused by fertilizer or phytotoxicity. Excessive fertilization or excessive spraying of pesticides can also cause heavier injury to cucumbers. 5. The soil is too dry and the supply of fertilizer is insufficient. Second, control methods 1. Supplement water and fertilizer. If the seedling stage is in a physiological drought state, it should be immediately watered and interlaced irrigation should be performed, ie, using a small amount of water to pour (to prevent flooding), submerged under-membrane irrigation (drip irrigation, sprinkler irrigation under certain conditions), and water infusion should be used. After light watering topdressing, timely cultivating loose soil to raise temperature can promote its germination of new leaves and turn into normal growth. 2. Increase the temperature. Farmers can increase the temperature by hanging light curtains, covering grass curtains and other methods. 3. Pick melon and fruit. After the flower is topping, it can be flexibly controlled according to the growing situation of the cucumber. Generally, the size of the melons on the plants is completely removed, and the more robust plants can retain 1 to 2 melons. 4. Spray conditioner. Use natural brassin, cytokinin and other plant growth regulators to spray, spray once every 7 to 10 days, and spray 2 to 4 times until the melon shoots return to normal growth. 5. Remove top melons to promote root development and plant rejuvenation.
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