In spring, the temperature gradually increases and the amplitude increases. Air humidity is high, and rainy days increase. Diseases and insect pests increase. At the same time, crop growth speeds up. The management of greenhouses must also be adjusted to these changes. The following points must be addressed:
In the early stage of temperature and light management, heat preservation work is well done, especially before the low temperature comes, small arch sheds are used to cover, and small arch sheds cover non-woven fabrics, straw curtains, etc. to increase insulation effect. At the same time, during the day, attention should be paid to timely removing the cover for ventilation and light, so as to prevent the light from being too weak and causing the seedlings to grow. When the weather is fine, the ventilation should be strengthened. Generally, ventilation should be conducted at 8 in the morning and closed in the afternoon at 16:00. It is not possible to close the greenhouse in case of high temperature barriers and burning of seedlings. Be careful not to open the hood and ventilate it suddenly at high temperatures, otherwise it may cause the plants to lose water and wilt. Pay attention to more lighting, try to make the shed more light, under the premise of not affecting the temperature of the shed, covering the shed to cover the late cover, in order to extend the lighting time.
Water and fertilizer management There are many spring and rainy days. Humidity in the shed is high and it is easy to cause various diseases. Timely ventilation, cooling, and dehumidification are effective prevention measures. We advocate the use of a full shed mulching method to reduce air humidity. In spring, the soil is generally required to be moist and dry. The soil of the seedling vegetables is dry and not poured. The watering selection is performed when the temperature rises. The amount of watering is soaked in wet layers, the humidity is high and the disease is long. Pay attention to replenish water according to the weather and soil moisture, and try not to water in rainy days.
Fertilizers are mainly based on basal fertilizers, with phosphorus and potassium micro-fertilizers applied without applying nitrogenous fertilizer. According to the growth of vegetables, fertilizer may not be top-dressed, and it may be applied once after planting. The amount of nitrogen fertilizer should not be too large to prevent crop resistance, plant growth, and female flowering rate and fruit setting rate. Fruits and vegetables after the results of a strong top dressing, after the application of fertilizers to do a good job of ventilation and humidity, fertilization should be selected after the temperature rise.
Plants are adjusted and weeding. Plants thrive in spring. Pruning, picking leaves, picking hearts, picking flowers, and fruit thinning can be used to increase ventilation between plants and increase light. This helps to reduce humidity in greenhouses, reduce disease, reduce ineffective consumption, and promote plant growth. . The operation was performed at high temperatures around noon to facilitate wound healing.
Prevention and control of diseases and insect pests Spring climate conditions are favorable for diseases and pests. The main diseases are gray mold, downy mildew, sclerotinia, anthrax, and blight, insect pests include aphids, whitefly, and spotted fly. At the same time as wetting, we should focus on prevention and prevention, and chemical control should use powder or fumigant as much as possible.
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