What is the reason for melon vegetables?

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%. There are many reasons for the production of melons. In general, the melons stop growing 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 the growth period, 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 frame shape, not conducive to photosynthesis, less assimilation products, easy to cause melon. Water deficiency or lack of fertilizer 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 in the absence of pollinators, and without artificial pollination, they are mainly parthenocarpic, and the ones with weak singles are easy to turn into melons.

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.

Sixth, flowers and fruits 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 melons are not harvested in time, it is easy to cause the upper melon to be removed.

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 it is impossible to carry out photosynthesis and turn the melon. Pests such as aphids, sassafras, and whitefly mites destroy the photosynthesis by absorbing 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 subjected to phytotoxicity and aging and dry, and the photosynthesis ability of the leaves is decreased or even lost. In addition, mechanical damage during management may also cause damage to young melons.