I. Cucumbers and tomatoes are the chiefs of criminals last winter was the warmest winter in the past 20 years. Winter warmth should be a good thing for the cultivation of cultivated land, but some of the greenhouse cucumbers and tomatoes are not growing too well. The cucumber leaves are too large, the stems are long, the petiole angle is less than 3, the melons are thin, and the melons are long. The tumors moved downwards; the tomato fruit grew slowly, unevenly colored, and the leaves became hypertrophic. Small leaves were already grown on the main veins of tomato leaves in individual winter greenhouses. The main reason for the above-mentioned performance is the uncoordinated temperature. The management of the warm winter is still managed by the method of cold winter. The light is good and the temperature is high. Instead of properly reducing the protection facilities, passive management is adopted and the wind is closed at night ( The indoor temperature dropped to 20°C. The grasshoppers were lowered (temperature dropped to 16°C). After putting the grasshoppers, the rainproof membranes were put on again. The temperature did not drop so much. In the morning, the indoor temperature was still around 15°C. Such management is contrary to the normal activities of plant physiology, affecting the normal operation of plant nutrients, so that nutrients can not be transported to the crop growth points, roots and fruits. Therefore, the above phenomenon of leggy was formed, and high quality and high quality were not obtained in the warm winter. Second, the leggy vegetable The management of the light and temperature of the winter shed should be maintained for 6 to 8 hours a day, and the room temperature should be maintained at about 10°C during the sunny day. When the sun shines on the shed, the grass should be uncovered. The indoor temperature dropped by 1°C in a short period of time and soon recovered. It was proved that the grasshopper was the most suitable at this time; if the grasshopper was uncovered and dropped by 1.5 to 2°C in a short period of time, it would be too early to explode it. If the grassland temperature is not lowered, but the temperature rises straight, it means that it is too late to unravel the haystack. When the temperature rises to 24°C, open 8 to 10 cm vents on the roof, conduct short ventilation for 15 to 20 minutes (supplemental CO2), and close the vents as soon as the temperature drops 1 to 2°C until 11 noon. About the point, the indoor temperature rose to 28 to 30 °C for secondary ventilation. In the afternoon, when the temperature drops to 25°C, the air vent is closed. At this time, there is a temperature rise of 1-2°C, which can effectively increase the heat storage temperature of the ground. At the same time, delaying the tuyere to delay the temperature decrease, the grasshopper can be put in late. ). The time for haystacks is to reduce the temperature in the greenhouse to 20°C. When the weather is warm, the temperature generally rises by 1 to 2°C. However, at 23 to 24 at night, the temperature in the greenhouse drops to 15°C, that is, from the evening. In the late night, the temperature dropped from 21°C to 15°C. It was the process of the plant's photosynthesis of carbohydrates to the crop roots, growing points and fruits in the course of one day; the temperature dropped from 15°C to 10°C in the middle of the night, and the crops were in half. Hibernation reduces the consumption of nutrients. If this law is violated, the crop cannot grow and grow, but it becomes a phenomenon of leggy. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone Operation Lamp,Wireless Ent Surgical Headlight,Surgical Dental Veterinary Head-Bend Led Light,Portable Led Shadowless Lamp Medton Medical , https://www.medtonmedical.com