Four Tips for Shed Control
Due to the high temperature in the greenhouse in winter and the entire greenhouse in a relatively sealed environment, the soil moisture in the greenhouse evaporates the humidity, which often causes the vegetable disease to spread. Therefore, preventing excessive humidity in the greenhouse is the moisture in the greenhouse in winter. Management focus. The first is mulching in the shed to reduce soil moisture evaporation in the shed. The second is watering at the right time and in the right amount. Do not water it at night, rainy days, or cold waves. The watering should be done on a sunny morning and at noon to ventilate and exhaust water and gas. Take a small amount of water pouring, subsurface irrigation. In winter, not only the temperature is low, but the ground temperature is also low. Excessive watering will cause the ground temperature to drop, cause poor soil ventilation, and directly affect root activity and absorption. The use of small water under irrigation under the film can not only meet the vegetable's need for water, but also not reduce the ground temperature excessively and affect the aeration status of the soil. Therefore, it can effectively solve the contradiction between soil water, air and heat, and is beneficial to the growth of vegetables. . Third, pay attention to ventilation and ventilation, without affecting the temperature conditions in the shed, early ventilation and regular ventilation. Ventilation is required not only on sunny days but also on rainy days. Ventilate after each watering. Fourth, timely multi-cultivation can reduce soil water evaporation and promote root development.
Remember not to cover the straw curtains in continuous cloudy, rainy and snowy weather, and do not water in cloudy weather. Do not spray water and pesticides when it is cloudy to prevent the humidity in the shed from increasing. On continuous cloudy days, due to lack of light, there is no effective heat supplement in the shed, so the simple thermal insulation measures not only fail to increase the temperature, but also cause yellowing of the vegetables in the dark environment. The correct method is to open the straw curtain every day even in continuous cloudy, rainy and snowy weather, so that the vegetables are exposed to scattered light to maintain the normal activity of chlorophyll. Generally, vegetables are allowed to receive scattered light for about 4 to 6 hours around noon. For plants with weak growth or more fruits, timely harvest and appropriate flowers and fruits should be used to reduce nutrient consumption and make the plants go through difficult times.
Improve the light conditions in the shed The natural light in winter is weak, and the light in the shed is often in a deficit state. If there is insufficient light, the increase in temperature will not only enhance photosynthesis, but will also accelerate respiratory consumption and cause nutrition loss, which will greatly reduce the resistance of plants. Adopting multiple methods to improve the light in the shed is an important technical measure for winter management. It is necessary to remove dust, snow and water droplets and water mist from the surface of the shed film at any time. Always keep the shed film clean and transparent, and improve the light transmittance of the shed film. In addition, under the premise of not affecting the temperature, the straw curtain should be lifted as early as possible to extend the light time of the vegetables.
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