With the gradual decrease of the outside temperature (especially the nighttime temperature), the greenhouse insulation has become a problem that many vegetable farmers have been very concerned about. Therefore, the ventilation time is shortened or the ventilation is not carried out, resulting in increased air humidity. In the low-temperature and high-humidity growth environment, many diseases (downy mildew, gray mold, bacterial keratoses, etc.) are frequently used by farmers, and the amount of mixed materials is large. As a result, the growth of plants is inhibited, and flowering occurs; Melon with flowers and high yield, a large number of preserved fruit hormones are used, reproductive growth is too strong, there melon topping; temperature is too low, unreasonable use of fertilizer (chemical fertilizer burning, lower ground temperature), the emergence of flowers topping. Therefore, in the current cucumber cultivation, the phenomenon of flower topping is very serious. Therefore, we must strengthen prevention and control in a timely manner.
symptom:
Saplings grow stagnant, leading tightly together. The nodes near the growing point are shortened, that is, small leaves close to the growing point are dense, sometimes accompanied by parachute leaves, and small vines appear in each leaf, and a large number of female flowers grow and open, resulting in capping, commonly known as “melon toppingâ€.
Cause:
To sum up, there are three main reasons: the reproductive growth and vegetative growth disorders of plants; root activity decline; phytotoxicity occurs, plant growth is inhibited. The specific reasons are as follows:
(1) The temperature is low, especially when the soil temperature and nighttime temperature are low. The root development of cucumber is poor and the activity is decreased. The ability of roots to produce cytokinins is reduced, and the growth point of plant growth points is inhibited.
(2) Large temperature difference between day and night, low temperature at night, less nutrient delivery to new parts (heads), inhibition of vegetative growth, and reproductive growth beyond vegetative growth.
(3) The soil is dry, the fertilizer is excessive and the roots are damaged, or the soil is long and damp and rooting.
(4) medication is irrational. The amount of flower hormones should be appropriate and the time of use should not be too early. Scientific medicine should be used to prevent disease and prevent the occurrence of injury.
Prevention:
(1) Do everything possible to increase the temperature in the protected area, especially at night.
(2) Timely soil loosening, raising soil temperature, promoting root development, and multiple new roots.
(3) Apply adequately decomposed manure, uniformly top-dressing, and use humic acid and microbial fertilizers. Avoid improper application of fertilizer to burn roots.
(4) Suitable irrigation at a proper time can not control excessive water. If the lack of water causes the flower to top, it should be watered in time. In addition, it depends on the watering of the sky to prevent the humidity of the cloudy water from increasing. In the event of disease, it is easy to reduce the temperature.
(5) The method of salvaging the flower topping has emerged: (1) Using 5mg/L aqueous solution of naphthaleneacetic acid and Aiduoxue 3000x liquid to mix roots to stimulate new roots to occur as soon as possible. 2 Remove all the size of the seeds that can be seen on the plants to reduce the burden on the plants. 3 Spray the plants with a regulator that can quickly promote the growth of stems and leaves, such as natural cloudhead (Yunda 120), love more, harvest No. 1, etc., to promote the rapid growth of stems and leaves; 4 recovery of available nitrogen fertilizer (ammonium nitrate), After the watering, the greenhouse is closed to increase the temperature and the night temperature is kept as high as possible. Generally 7 to 10 days can be basically restored, and gradually transferred to normal management.
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