Insulation and antifreeze. The temperature in early spring is still low, and warm vegetables such as solanes and melons are susceptible to cold damage and freezing damage. The causes of chilling and freezing damage are mainly the strong growth of plants, and the increase of water and fertilizer in man-made management has significantly reduced the cold resistance of plants. Solanaceous vegetables have a large amount of growth and must be covered with a two-layer membrane in the greenhouse. Melon vegetables are more susceptible to freezing than canola fruit vegetables. In addition to covering with a two-layer film, straw bundles can be stacked in the skirt around the shed to enhance the intrusion of cold air around the greenhouse; in case of strong cold air It is necessary to do a good job of anti-freezing and thermal insulation measures, and it can be temporarily warmed up.
Ventilation and ventilation. After the beginning of spring, because the temperature is still low, most vegetable farmers are less ventilated for heat preservation, resulting in high humidity in the shed and high incidence of pests and diseases. In order to meet the requirements of the environmental conditions for the growth and development of melons, it is necessary to coordinate the relationship between temperature and humidity regulation in the shed. It is necessary to open the door and uncover the membrane ventilation, close the door and cover the membrane insulation work depending on the weather changes and plant growth conditions. Linyi Fertilizer Network Copyright
Preserved flowers and fruits. Low temperature will affect the fertilization results of many melons and vegetables, and it is easy to fall into the fruit and fruit. At present, the method of increasing the fruit setting rate is to apply the plant growth regulator to the ovary or to apply the plant growth regulator according to the instructions to prevent the concentration from being too high and causing phytotoxicity. The second is to use artificial assisted pollination, that is, artificial flowering. Linyi Fertilizer Network Copyright
Pest Control. Melon in the greenhouse is prone to gray mold, blight, blight and aphids. Pest control should be combined with agricultural control and chemical control, such as reducing the humidity in the shed, raking grass, rational fertilizing water, timely pruning, removing old leaves, spraying pesticides against pesticides. Linyi Fertilizer Network Copyright
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