Reasons for "flower topping"
Too low temperature Due to poor thermal insulation or low management temperature in the shed, the temperature in the shed is high during the day and the temperature is low at night. The female flowers are too differentiated and consume a lot of nutrients.
Improper management Traditional greenhouse management is mainly "dry and cold", that is, the temperature in the shed is controlled below 28 ° C, and less watering, which often causes the plant to be in a state of severe water shortage and poor growth. The phenomenon is formed.
Excessive fertilization or excessive spraying of pesticides caused by chemical fertilizer damage will also cause heavy chemical damage to cucumbers, which is prone to "flower topping".
Old seedlings and weak seedlings affect old seedlings or weak seedlings with too long seedling age, the root system absorption capacity becomes poor, and the growth potential is weak, forming a "flower topping".
Improper use of hormones In order to show more female flowers, vegetable farmers have repeatedly used female pro-regulators, which inhibited the vegetative growth of the plants, transformed the flower primordia into female flowers, consumed excessive nutrients, and caused the plants to "flower topping."
Measures to prevent "flower topping"
Strengthen the management of water and fertilizer. Some growth points have not disappeared, but they are hidden between the flowers. Through watering and closed sheds, the temperature and humidity can be increased to promote growth. Quick-acting nitrogen and potassium fertilizers can also be applied in appropriate amounts.
Raising the temperature Vegetable farmers can increase the shed temperature by hanging reflective curtains and adding straw curtains.
Reasonable sparse melon "flower topping" can be flexibly controlled according to the growth of cucumbers. Generally, all melons on the plant are removed, and more robust plants can retain 1 or 2 melon.
Spraying regulators are sprayed with plant growth regulators such as natural brassin and cytokinin, sprayed once every 7 to 10 days, and sprayed 2 to 4 times until the normal growth of the melon seedlings.
Scientific medicines are used in the early stages of disease and insect pests. One is to control them early; the other is to choose pesticides with high efficiency, low toxicity and low residue; the third is to correctly master the application technology, and strictly administer the drugs in accordance with the prescribed concentration and dosage to achieve scientific and reasonable mixing; Avoid the application of the plant when the drug resistance is weak. Generally, it is easy to produce pesticide damage at the seedling and flowering stages, so special attention must be paid.
Remediate the plants that have “flower topping†in time, remove female flowers in appropriate amounts, and spray with potassium dihydrogen phosphate 300 times liquid, or spray melon seedlings with regulators that quickly promote stem and leaf growth, such as natural brassinolide, Harvest more, harvest one, etc., to promote faster growth of stems and leaves. When the root-burning “flower topping†appears, watering the plow in time can usually return to normal.
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