In wintering greenhouse vegetables, there are many kinds of severe weather. Unfavorable climatic conditions have a great impact on the production of solar greenhouse vegetables. Therefore, the field management of solar greenhouses must be strengthened during this period. Warming and Insulation Measures: For the sheds that have less grass curtains, thinner back walls, and poor heat insulation, it is necessary to increase the thickness of the awning curtains, use double curtains as much as possible, and cover the sheds with anti-rain and snow plastic film. The straw curtains are dry. If the temperature in the greenhouse is lower than 6°C, it should be heated by burning the stove; cucumber, tomato and fruit vegetables should be mainly used for root protection, preservation and preservation. Pay attention to severe weather management: even cloudy management. If the temperature is not low, we must uncover the straw curtain. If the sun is exposed for a short time, the temperature inside the shed will increase. Hanging a light curtain on the back wall of the greenhouse will also play a role of lightening and warming on cloudy days. Keep room temperature at night not less than 10°C, and strive to store more heat on the sunny back wall. The daytime temperature should be controlled at 25°C~28°C, and more than 30°C should be promptly windproof. When there are more cloudy days in winter, it should cover the mulch film earlier, increase the temperature of the ground, and reduce the occurrence of low-temperature freezing damage. After a long period of haze and clear management. For a long period of cloudy and foggy weather, once it is sunny, the transpiration of vegetables will be strengthened, and the absorption of roots will not be able to keep up. After sunny days, a large number of dead seedlings will occur. First, we must pay attention to covering the straw curtains to prevent flash seedlings. After the weather turns green, the temperature rises quickly and the seedlings will drastically wilt. From 10:00 am, the changes of seedlings should be taken care of, and appropriate measures should be taken to cover the grass curtains and spray water (or foliar fertilizer) into the shed. Secondly, after sunny days, watering as little as possible must be done before the roots are rejuvenated and then watered, otherwise it is easy to cause dead roots. If you need to top-dressing with water, you should pour small water, and apply the quick-dissolving fertilizer with water. The concentration should be small. At the end of the sunny days, the rooting agent was used to irrigate the roots, and the leaves were sprayed with multi-element micronutrients to make up for the lack of root absorption. Snowfall management. During the daytime snowfall, we must roll up the grass curtains. Immediately after the snow stops, we shall clear the snow on the shed film. The parts of the greenhouse slope that are more difficult to clean should be scraped down with a smooth wooden stick. Do not scratch the film as much as possible. Snowfall at night, but also pay attention to the timely removal of snow on the straw, should use plastic film in advance to wrap the straw, to prevent the straw curtain water absorption, resulting in excessive weight of the shed body to make the arch distortion, or even collapse. Windy weather management. When the shed film has a bulging phenomenon, immediately squeeze the film line or put down some grass curtains and press it in the middle of the greenhouse before the greenhouse. When the wind is encountered at night, it is best to place a straw curtain across the front of the greenhouse and press it firmly with stones.
Pharmaceutical excipients refer to excipients and additives used in the production of drugs and formulating prescriptions; in addition to the active ingredients, they are substances that have been reasonably evaluated in terms of safety and are included in pharmaceutical preparations.Pharmaceutical excipients are the basic materials and important components of pharmaceutical preparations, which are the material basis to ensure the production and development of pharmaceutical preparations, and play a key role in the formulation and production of pharmaceutical preparations.It doesn't just give drugs a certain dosage form.Moreover, it has a great relationship with improving the curative effect of drugs and reducing adverse reactions.
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