Facilities Vegetable Science Management Coping with Bad Weather
Now, it is the critical period for the growth of vegetables in the facility. However, low temperatures, coupled with frequent haze and snowfall, have a greater impact on the production of facilities for vegetables.
The haze and snowfall continued to make the greenhouse vegetable light and temperature significantly insufficient. The low-temperature, high-humidity micro-climate environment can easily lead to slow growth of the vegetable plant, or stop growing, or even die. In order to ensure the increase of greenhouse vegetable yields, all growers should be managed scientifically and actively take measures to deal with them. Pay attention to the cold insulation of greenhouses, timely cover straw, insulation, cold film, reduce the heat loss in the shed; in case of hazy weather, pay attention to warming and supplement light, conditional greenhouses to install warming lamps, fill lights, Heaters and other heat-supplementing facilities increase temperature, increase light, and promote plant growth. In case of snow weather, the snow on the shed film should be promptly removed. The snow on both sides of the greenhouse should also be cleared in time to prevent absorption of large amounts of heat during melting and reduce the temperature inside the shed. When removing snow, damage to the shed film should be avoided as much as possible. In addition, we must also control watering, rational fertilization, and prevention of pests and diseases. In low-temperature and no-illumination conditions, as far as possible, no irrigation or less irrigation is required, and timely dehumidification is performed by spraying grass and wood ash. When fertilizing, it is necessary to control the amount of nitrogen fertilizer and increase the application of phosphorus and potassium fertilizers.
Of particular note is that during this period, gray mold is a high incidence of greenhouse cucumber and other vegetables, farmers should promptly prevent and control. The disease mainly harms young larvae and leaves, and the bacteria reinfested by airflow and agricultural operations. Botrytis cinerea suitable for the onset of temperature 20 °C ~ 23 °C, humidity above 90%, low temperature and high humidity, low light is conducive to disease, flooding and flooding and even cloudy or haze weather, fog days are an important factor in the induced gray mold . Ultraviolet ozone germicidal light source can be installed. The function is to use the ultraviolet light emitted by the light source to produce low-level ozone. At the same time, it can purify and sterilize the environment. It can be used to prevent and eliminate gas-borne diseases in greenhouses and reduce diseases. Its advantages are: First, low cost of safety and high efficiency. Ozone can be used for multiple purposes and at the same time prevent and control various pests, and the control costs are low. Compared with the spraying of pesticides, it is safer, more convenient, more reliable, and at the same time greatly reduces the amount of pesticides used, thereby reducing the cost of medication. The second is pollution-free. Ozone is unstable in dry air and can be quickly decomposed and reduced to oxygen, so there is no pollution or residue in plants and fruits. The third is to increase production and quality. After the experiment, after installing the ultraviolet ozone germicidal light source, the cucumber is colored well, the taste is good, and the yield is improved. When using it, it is necessary to pay attention to: reasonably determine the amount and time of application, the amount of ozone released and the release time should be adjusted according to different crops and their growth period, and should be as uniform as possible when spraying, and the jet can not directly face the vegetables and should be away from the vegetables. Plants more than 0.8 meters. The ventilation time should be promptly after the time of application is reached. Generally, the ventilation time can not be less than 30 minutes. During the period, prevent people and livestock from entering to avoid causing poisoning or other adverse reactions. When the ozone is released, the temperature in the shed room should be kept within the range of 10°C-30°C, and the control effect will be better under the condition of high air humidity.
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