Regulating temperature
In early spring, the temperature changes greatly, and management is based on reasonable temperature control. The indoor temperature should be controlled by reasonable air release, and the indoor temperature of eggplant, pepper and other vegetables should be controlled at 28 °C ~ 30 °C, 14 °C ~ 16 °C during the night; tomatoes, zucchini and other vegetables should be controlled during the day 25 ° C ~ 28 ° C, night 12 ° C ~14 ° C. When the temperature in the tomato shed rises to about 28 °C, the wind starts to be released. Generally, the top wind is used, and the ventilation is gradually increased as the outside temperature gradually rises. Before the outside temperature drops from 4 to 5 pm, cover the grasshoppers in time to ensure that the temperature in the shed is always within the range suitable for vegetable growth. Do not let the wind or less air when the temperature in the shed is not high or when the wind blows during the day. In the event of rain, snow or windy weather, take the necessary temporary heating measures to prevent the temperature from being too low, but also prevent the night temperature from being too high, so as not to cause the seedlings to grow. When the temperature is too high in the later period, the bottom wind can be used. When the minimum temperature at night is above 15 °C, the grass is no longer covered, and it is ventilated day and night.
Scientific Watering
In early spring, due to the low outside temperature and the small amount of ventilation in the greenhouse, attention should be paid to the timing, time, frequency and watering method of watering. In the greenhouse, the film is covered and cultivated. It is best to use the under-film dark irrigation or drip irrigation, and the small water is the main water, and it is not possible to flood the water.
The watering time depends on the weather to ensure that there are 2 to 3 sunny weather after watering. Try to choose a sunny day in the day, depending on the weather, plant growth and soil moisture. Watering in early spring does not have to be too diligent to prevent the occurrence and spread of diseases caused by excessive humidity. After mid-to-late March, as the temperature increases and the plant growth accelerates, the amount and frequency of irrigation can be appropriately increased. Generally, after the watering, the shed film should be closed to increase the temperature inside the shed. After the temperature rises, the air is ventilated and dehydrated in time, which is conducive to the robust growth of the plant and inhibit the occurrence of pests and diseases.
Windproof
Spring is windy and windy, and it may also be accompanied by sandstorms. Therefore, it is very important to do windproof work to protect the shed film and skeleton. Especially in the case of high winds with high winds, such as the tightness of the shed film, it is often torn by the wind. To this end, pay attention to the weather forecast. Before the wind blows, fix the scaffolding, fasten the laminating line, check the shed film for damage, find problems, and take targeted precautions as soon as possible.
Improve Light
First, try to extend the lighting time and increase the light intensity. Under the conditions that the temperature in the shed is guaranteed, whether it is sunny or cloudy, the grass hoe should be exposed as early as possible to maximize the time of seeing vegetables in the shed; the second is to maintain a reasonable group structure. Into the greenhouse vegetables in the middle and late growth stages, we should do the work of pruning and tying the vines to improve the utilization of light energy. And timely remove old leaves, yellow leaves, diseased leaves, etc., reduce nutrient consumption and prevent the spread of disease.
Timely topdressing
While appropriately increasing the number of watering and the amount of watering, the fertilizer is applied once every 7 days in combination with the watering (cucumber can be applied once every 3 to 5 days). Topdressing should master the principle of “small number of times†and increase the application of phosphorus and potassium fertilizer to improve the stress resistance of plants and improve their quality. At the same time as the root application, foliar spray fertilizer can be used, such as spraying 0.2% to 0.3% of urea solution or potassium dihydrogen phosphate solution.
Pest Control
As the temperature rises, vegetable diseases and insect pests in the greenhouse will also occur. For the prevention and control of various pests and diseases, we must actively implement the plant protection policy of “prevention first, comprehensive prevention†and conduct targeted prevention and control. It is necessary to pay attention to the selection of high-efficiency, low-toxic, low-residue pesticides to control the spread of pests and diseases.
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