The melon is the melon that is just sitting and the melon that is developing, and the growth is stagnant. From the tip of the melon to the whole melon, it gradually turns yellow, dry, and finally dry. Melon is a common problem in the production of melons, which directly affects the yield and output value. Especially in greenhouse cultivation, if the management is not proper, the rate of melon can be as high as 30% to 60%. The reason for the production of melons is multifaceted. In general, the melons stop developing because they do not get enough nutrients during the growth process. The specific reasons are as follows:
First, the temperature is not suitable
The temperature during the day is too high (over 35°C) or too low (below 20°C). The daytime temperature in the shed is higher than 32 °C, and the nighttime temperature is lower than 18 °C, which will cause photosynthesis to be blocked, assimilation products are reduced, respiratory consumption is increased, and nutrient accumulation is less, resulting in malnutrition and melon.
Melon vegetables suffer from cold damage during growth, especially the ground temperature is too low, resulting in poor root development, reduced absorption capacity, and insufficient supply of melons.
Second, the carbon dioxide concentration is low
Melon vegetables are generally very sensitive to changes in carbon dioxide gas concentration. If the concentration of carbon dioxide in the greenhouse is too low, it is easy to turn the melon.
Third, the cultivation density is too large, the supply of fertilizer and water is unreasonable
The cultivation density is too large, even the yin and irritability, poor ventilation, resulting in canopy closure, unreasonable shape, not conducive to photosynthesis, less assimilation products, easy to cause melon. Water deficiency and fat deficiency or lack of trace elements due to improper fertilization also affect photosynthesis.
Fourth, single sex
In the solar greenhouse, the temperature difference between day and night in the early growth period is large, and there are many female flowers and less male flowers. At this time, the insects have not been active and lack pollination medium, and without artificial pollination, they are mainly parthenocarpic, and the single-sex and weak-skinned varieties are easy to be melon.
5. Stem and leaves grow too rich
Due to the high nitrogen and water, the high night temperature, the watering and topdressing before the root melon is sitting, the temporary empty space, the lack of melon on the plant, and the sufficient supply of water and fertilizer as usual, the stems are thick and thick, the leaves are thin, and the growth is too strong. While the melons grow slowly, the female flowers and the young melons are not assimilated and are eliminated.
Six, flower and fruit grow too strong
There are too many female flowers and young melons on the plants. The limited assimilation products can only be distributed to large melons or some female flowers and young melons, which will cause most female flowers and young melons to be eliminated. Plant growth and fruiting period, if the following melon is not harvested in time, it is easy to cause the top melon.
Seven, serious pests and diseases
Downy mildew, bacterial angular leaf spot, anthracnose, powdery mildew, black spot disease, etc., will directly damage the leaves, causing leaf necrosis. In severe cases, the whole leaves or whole leaves are dry, and photosynthesis cannot be used to turn the melons. Pests such as aphids, sassafras, and whitefly mites destroy the photosynthesis by sucking the leaves and sap of leaves of melons, causing malnutrition and turning melons.
Eight, phytotoxicity
If the choice of the medicament is unreasonable, the spray concentration is too high, or the spray is too diligent, the melon vegetables are phytotoxic and aging and dry, and the photosynthesis ability of the leaves is reduced or even lost. In addition, mechanical damage during management may also cause damage to young melons.
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