As temperature rises and sunshine hours extend, the management of vegetables in spring has also entered a critical period. The management of temperature, humidity, light, and nutrition should be adjusted in accordance with the changes in the external environment. In addition to the timely prevention of pests and diseases, the production of Need to grasp the following three aspects:
Temperature off
The humidity in the spring shed is relatively high. High temperatures and high humidity often cause various diseases. Ventilation, cooling, and dehumidification are important means for controlling the occurrence of diseases. The correct management method is to control the temperature in the daytime shed at 28°C-30°C, and control it at 14°C-16°C at night. When the temperature in the shed rises to about 30°C, it starts to ventilate, and gradually increases as the ambient temperature gradually increases. Large ventilation; 3-4 pm before the outside temperature decline, timely closure of the vents; noon in the noon shed is not high or during the day when the wind is usually not ventilated or less ventilation; when the minimum night temperature above 15 °C, can be day and night ventilation . The optimum temperature for the normal growth of different vegetables is different, too high or too low temperature is not conducive to flowering and results, easy to form deformed fruit or lead to falling fruit.
Moisture level
Spring is the season of vegetable pests and diseases, and it is particularly important to control pests and diseases. In the management of water, we should follow the principle of "just in time, not less, rather less." It is generally required that the soil be moist and dry, especially vegetables that are in the seedling stage. Excessive humidity will not only cause diseases, but will also lead to leggy seedlings. Seedling vegetables require the soil not to pour.
Watering sheds are covered with mulching film. The early watering can be under the film of dark irrigation or drip irrigation, in order to effectively prevent evaporation of ground water, reduce air humidity in the greenhouse, and reduce the occurrence of various diseases. After the temperature rises in the later period, it can be poured out.
The watering time should be chosen to be watered when the temperature rises in the sunny morning. At this time, the water temperature is close to the ground temperature. After the watering, the root system is stimulated and easy to adapt. At the same time, the ground temperature recovers quickly, and there is enough time to exclude the moisture in the shed; Water will cause a sudden change in the temperature of the ground, affect the physiological function of the root system, and should not be watered in the afternoon or evening.
Watering quantity depends on the weather, plant growth conditions and soil moisture conditions. The temperature in early spring is relatively low, and the watering need not be too hard to prevent the occurrence of the disease and the spread of the disease caused by excessive humidity. After April, the temperature rose rapidly, plant growth accelerated, and watering and watering times were appropriately increased. Generally, after the watering, the greenhouse is closed for a short period of time to increase the temperature inside the greenhouse. After the ground temperature rises, ventilation and dehumidification are performed.
Fertilization off
The principle of "balanced fertilization and reasonable top dressing" should be followed, and the fertilization management of spring vegetables should be well managed. In the middle and late stages of growth and development, the plant needs to increase the amount of fertilizer, and it is prone to defertilization, leading to premature plant failure. While appropriately increasing the number of times of watering and watering, the fertilizer is applied once every 7 days in conjunction with watering. Fertilizers should master the principle of “few times†and avoid excessive use of chemical fertilizers at one time to cause waste or excessive rooting. Pay attention to balanced fertilization, and increase the application amount of phosphorus and potassium fertilizers to increase the stress resistance of the plants.
Temperature off
The humidity in the spring shed is relatively high. High temperatures and high humidity often cause various diseases. Ventilation, cooling, and dehumidification are important means for controlling the occurrence of diseases. The correct management method is to control the temperature in the daytime shed at 28°C-30°C, and control it at 14°C-16°C at night. When the temperature in the shed rises to about 30°C, it starts to ventilate, and gradually increases as the ambient temperature gradually increases. Large ventilation; 3-4 pm before the outside temperature decline, timely closure of the vents; noon in the noon shed is not high or during the day when the wind is usually not ventilated or less ventilation; when the minimum night temperature above 15 °C, can be day and night ventilation . The optimum temperature for the normal growth of different vegetables is different, too high or too low temperature is not conducive to flowering and results, easy to form deformed fruit or lead to falling fruit.
Moisture level
Spring is the season of vegetable pests and diseases, and it is particularly important to control pests and diseases. In the management of water, we should follow the principle of "just in time, not less, rather less." It is generally required that the soil be moist and dry, especially vegetables that are in the seedling stage. Excessive humidity will not only cause diseases, but will also lead to leggy seedlings. Seedling vegetables require the soil not to pour.
Watering sheds are covered with mulching film. The early watering can be under the film of dark irrigation or drip irrigation, in order to effectively prevent evaporation of ground water, reduce air humidity in the greenhouse, and reduce the occurrence of various diseases. After the temperature rises in the later period, it can be poured out.
The watering time should be chosen to be watered when the temperature rises in the sunny morning. At this time, the water temperature is close to the ground temperature. After the watering, the root system is stimulated and easy to adapt. At the same time, the ground temperature recovers quickly, and there is enough time to exclude the moisture in the shed; Water will cause a sudden change in the temperature of the ground, affect the physiological function of the root system, and should not be watered in the afternoon or evening.
Watering quantity depends on the weather, plant growth conditions and soil moisture conditions. The temperature in early spring is relatively low, and the watering need not be too hard to prevent the occurrence of the disease and the spread of the disease caused by excessive humidity. After April, the temperature rose rapidly, plant growth accelerated, and watering and watering times were appropriately increased. Generally, after the watering, the greenhouse is closed for a short period of time to increase the temperature inside the greenhouse. After the ground temperature rises, ventilation and dehumidification are performed.
Fertilization off
The principle of "balanced fertilization and reasonable top dressing" should be followed, and the fertilization management of spring vegetables should be well managed. In the middle and late stages of growth and development, the plant needs to increase the amount of fertilizer, and it is prone to defertilization, leading to premature plant failure. While appropriately increasing the number of times of watering and watering, the fertilizer is applied once every 7 days in conjunction with watering. Fertilizers should master the principle of “few times†and avoid excessive use of chemical fertilizers at one time to cause waste or excessive rooting. Pay attention to balanced fertilization, and increase the application amount of phosphorus and potassium fertilizers to increase the stress resistance of the plants.
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