Causes of falling
1. Peppers prefer air drying and moist soils. If the temperature is high (more than 35°C), it will affect pollination and fertilization, which may cause plants to grow in length, cause flowers to fall, or may encounter long rainy days, causing insufficient light. Temperature drops (below 15°C) can also affect pollination and the elongation of pollen tubes, resulting in falling flowers.
2, soil drought, lack of water, air evaporation, will also inhibit the plant's demand for fertilizer and water, resulting in falling flowers. Excessive water content and poor permeability may restrict root respiration and growth and even cause root damage.
3. Excessive or insufficient nitrogen fertilizer or lack of phosphorus and potassium may result in incoordination of various nutrients, which will cause the fruit and fruit to fall due to lack of nutrients or nutritional disorders. Density is too large, resulting in poor ventilation and male flower development, making the first and second layer of flowers easy to fall off.
4. Insufficient management of chili peppers and vines: Some growers adopted cone-shaped hanging sticks for the convenience of the work. They tied four nylon slings to the steel wire, and then hoisted the four main branches of the same pepper to make the original scattered. The growing pepper twigs are closed together inwards. The twigs grow vertically and do not spread. Even if the pepper plants have sufficient leaf area, the effective photosynthetic area is insufficient due to the severe occlusions between the branches and leaves, and the photosynthetic product is manufactured. Less, resulting in serious drop. Followed by the elimination of lychee. Some vegetable farmers originally thought that the leaves of the Litchi chinensis used scattered light to make nutrients to satisfy its own consumption, so there was no need to laboriously remove the Litchi. The inner litchi leaves can use scattered light to produce organic matter, but the inner litchi can affect the ventilation and translucency between the plants, which can easily cause canopy closure, resulting in the consumption of nutrients that are greater than the nutrients produced and the organic matter transported to flowers and fruits. The decrease leads to serious drop and fruit drop, so the inner litchi of the pepper should be removed in time.
Control methods
1. Strengthen pruning, install reflective screens, fill light, and improve plant lighting conditions.
Insufficient light is the leading cause of serious downfall, and farmers can install dedicated fill lights in the shed to fill the light on the back wall of the greenhouse during the daytime to increase the use of scattered light. Enhance the photosynthesis of peppers. Loosening the ropes of peppers to increase the opening angle of pepper sticks, strengthen pruning, and remove excessive shoots, especially internal litchi, can also increase the light-receiving area of ​​the leaves and reduce nutrient consumption. The fruit setting rate of pepper.
2, reduce the humidity within the greenhouse, shaking plants, conducive to pollination.
The flowering and pollination of vegetables also requires humidity. When there is little ventilation in the ceiling, the humidity in the shed is too large, which can easily lead to poor pollen development, such as pepper, and the activity is reduced. It does not adhere well to the stigma of the pistil, resulting in reduced pollination rate of the pepper. Therefore, even in cloudy days, it is necessary to pay attention to the interval of 2-3 times during the period from 12 noon to 2 o'clock in the afternoon. The tuyere is 7 to 10 centimeters in diameter, and each exhalation time can be about 15 minutes. In this way, the humidity in the booth can be reduced as much as possible without significantly affecting the temperature in the booth. The vegetable grower can also take measures to ensure that as much pollen as possible adheres to the stigma of the pepper pistil, thus first ensuring the quality of the pollination.
3, leaf nutrition.
Falling and falling fruit is serious, mainly due to insufficient supply of nutrients. Even when the shade is cloudy, growers can increase the growth of the pepper through the method of adding fertilizer to the leaves. Foliage spraying 200 times of glucose, full nutrition foliar fertilizer 500 times mixed nucleotides 1000 times, 1000 times of chitin method, add energy for pepper, improve plant resistance, thereby reducing the amount of fruit and vegetable drop caused by excessive nutrient consumption .
Spraying plant growth regulators such as naphthalene acetic acid can promote flowering and fruit setting, but the amount used should not be too large. The dosage should be controlled between 30-40 mg/kg. After the use of naphthaleneacetic acid, the leaves of the pepper plant will appear 2-3 days of curved leaves and will recover on their own after a few days.
In addition, in the prevention of pests and diseases, in order to avoid increasing the humidity in the greenhouse, powder or smoke agents should be used. When spraying, it is necessary to select a good weather in the morning and ventilation reduces the humidity in the booth.
dry flowers
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