How to prevent and control the phenomenon of "flower topping" of overwintering cucumber in greenhouse

Cucumber flower topping

The phenomenon of flower topping often occurs in greenhouse cucumber production in winter, and cucumber flower topping is also called flower holding head, which is a common physiological obstacle on greenhouse cucumber. The main manifestations are shortening of internodes near the growing point, short heart leaves, male and female flower pattern clusters, showing flower holding head shape. It usually occurs frequently at the early fruiting stage, which has a great influence on the yield and quality of cucumber. Next, introduce the reasons and control methods of cucumber flower topping.

1. The main reason for the flower topping of cucumbers in greenhouse.

1. Temperature maladjustment. From the slow seedling stage to the early flowering and fruiting stage, if continuous low temperature occurs, the vegetative growth of the plant is blocked, and the flower topping is easy to occur if the reproductive growth is too fast.

2. Retting root rotting type. High temperature and drought in the greenhouse, especially when the soil is dry, root burning is caused by too much fertilizer and insufficient moisture, or the soil is too wet, but the air temperature and ground temperature are too low, resulting in retting roots, which are easy to form flowers and topping.

3. The type of imbalance of water and fertilizer. Uncomfortable soil conditions, weak root activity, poor ability to absorb water and fertilizer, due to physiological lack of fertilizer, there will also be cucumber flower topping.

II. Prevention methods

Reasonably regulate the temperature, prevent the temperature from being too low or too high, and maintain the appropriate temperature. Timely ploughing and loosening soil hoe, in order to improve the soil temperature, if necessary, first appropriate fertilization, watering, and then loosen the soil to raise temperature, to promote root development and root growth. Scientific operation of fertilizer and water, greenhouse cucumber water fertilizer application should grasp the principle of a small amount, many times, evenly applied, especially the application of organic fertilizer must be fully mature to prevent root damage due to improper fertilization, and the amount and times of topdressing should be reduced as much as possible according to weather conditions. Appropriate watering to avoid flooding and affect the ground temperature, resulting in retting roots. To strengthen field management, plants with flowers topping appeared, young melons and female flowers were properly removed, and 500-fold liquid leaves were sprayed with potassium dihydrogen phosphate. For the topping of flowers caused by low temperature and freezing injury, plant regulators such as green protection and brassine can be sprayed to enhance the cold resistance of plants and promote the development of roots and plants.