What causes cucumber flower topping?

What causes cucumber flower topping? Please introduce cucumber "flower topping", also known as "flower holding head", which is a common physiological obstacle on cucumber in greenhouse, which is usually characterized by shortening of internodes near the growing point and heterozygous flower clusters without heart leaf formation, showing the shape of "flower holding head". Flower beating occurs at most in the early fruiting stage, which has a great effect on the yield and quality of cucumber. According to many years' experimental observation, cucumber flower topping can be divided into three types: 1, developmental disorder type. Because of the low temperature in the early stage and the large temperature difference between day and night, the plant reproductive growth is too fast due to the inhibition of vegetative growth, which is easy to produce flower topping. 2. Root injury type. High temperature and drought in the greenhouse, especially when the soil is dry, root burning is caused by too much fertilizer and lack of moisture, or the soil is too wet, but the air temperature and ground temperature are low, resulting in retting roots, which are easy to form flowers and topping. 3. Physiologically deficient type. Unsuitable soil conditions, weak root activity and difficulty in fertilizer absorption also lead to flower topping when physiological fertilizer deficiency occurs. Prevention methods: ⑴ reasonably controls the temperature to prevent the temperature from being too low or too high; loosen the soil in time, increase the soil temperature, apply appropriate amount of fertilizer and water if necessary, and then loosen the soil to increase the temperature, so as to promote the development of the root system. ⑵ uses fertilizer and water rationally. Greenhouse cucumber fertilization, to master a small amount, many times, evenly applied, the application of organic fertilizer must be fully mature, to prevent root damage due to improper fertilization. Timely and appropriate watering, to avoid flooding and affect the ground temperature, resulting in retting roots. ⑶ remediation. For plants with flowers topping, appropriate amount of female flowers are removed and foliar spraying with 300-fold solution of potassium dihydrogen phosphate; when root-burning flowers are topped, they are watered in time, so that the soil water holding capacity reaches 22%, and when the air relative humidity reaches 65%, it will soon return to normal. Click to get more cucumber planting techniques click to get more vegetable planting techniques