Temperature difference between day and night increases the physiological disease of early prevention vegetables
Recently, cold air hits, physiological diseases of vegetables are frequent, such as cucumber flow glue, tomato cracking fruit and so on. The farmers' friends need to change their management methods in time according to seasonal changes so as to prevent various emergencies.
The disadvantage of excessive temperature difference
Physiological diseases of vegetables in recent days are frequent, mainly due to excessive temperature difference between day and night in the greenhouse, and severe changes in dry and wet conditions. In recent days, the maximum temperature in the shed during the daytime can reach 30°C, and the minimum temperature in the night is only about 10°C. Moreover, many vegetable growers still follow the summer management routines, do not close the vents, and ventilate around the clock. This is a rough calculation and the temperature difference is 20°C. the above. Some vegetable farmers questioned whether the newspapers have always advocated “drawing on temperature differences and seeking high yieldsâ€. Now is a good time. How can it not be done? It is really good to pull up the temperature difference, but the temperature difference here refers to the appropriate temperature difference - 10 °C ~ 15 °C, if the temperature difference is more than 15 °C, it will affect the normal growth of vegetables. Taking cucumber as an example, when the temperature difference between day and night exceeds 20°C, the net photosynthetic efficiency increases, the accumulation of organic nutrients increases, and the growth of melon meat is fast. However, the growth rate of melon skin is slow, and the melon skin is broken, forming some small cracks and flowing out of colloidal particles. In particular, when the melon strips condense in the morning, a cool breeze blows over them, and the surface of the melon strips changes drastically, causing tiny cracks.
Change management
Reasonable ventilation can no longer be ventilated as before or after summer day and night. At night, it is necessary to properly close the ventilation openings or pull small ventilation openings so as to avoid nighttime temperature being too low, resulting in excessive temperature difference between day and night. It can be ventilated as early as during the daytime, and gradually increase the amount of ventilation so that the temperature of the booth can reach 30°C and then the ventilation can cause the temperature and humidity to change greatly.
Timely watering, irrigating, watering, and replenishing can be selected for sunny morning. At present, autumn wolfberry vegetables have already entered the result period, and bolus fertilizer is dominated by high-potassium water-soluble fertilizer. In order to avoid premature aging, two waters are used to redraw the balanced water-soluble solution of nitrogen, phosphorus and potassium. fat.
Spraying attention concentration and timing of cucumber leaf blight, tomato leaf spot disease occurred one after another in recent days, some of the farmer drug concentration is relatively large, frequent injury, but also easily lead to cracking, suede flow plastic and so on. Therefore, it is recommended that the same dose of spray when spraying a sprayer water to spray more finished, although it is time-consuming, but it is not prone to phytotoxicity, and is conducive to liquid absorption, better control effect. Spray as much as possible on the sunny afternoon to dry the sun before the liquid is appropriate. When it comes to the weather of Lianyungang, do not rush to spray and prevent disease. Many vegetable growers sprayed a large amount of fungicide on the morning after the chilly sunny day. As a result, the peel did not suffer from excessive pesticides and phytotoxicity occurred, resulting in fruit cracking or molting. Therefore, in the case of a sunny day after a cloudy day, give the plants a slow adaptation before spraying, and then spray and prevent disease.
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