Cultivation of chrysanthemum in greenhouse in autumn and winter

Because chrysanthemum has the characteristics of low temperature tolerance, cold preference, poor light tolerance, low light saturation point and photosynthetic intensity, it is not only feasible to cultivate chrysanthemum in greenhouse in autumn and winter, but also can be listed during Spring Festival, greatly improving economic benefits. Its cultivation points are as follows: First, the northern region in early October to mid-November, during the Spring Festival listed. Second, seed selection should select varieties with strong cold resistance, relatively disease resistance, good quality and high yield. 3. When sowing, remove the residual plants of the previous crop in the greenhouse, prepare the soil and fertilize, apply 3000-4000 kg of farm manure per mu, plough 15-20 cm deep, make half-height beds, which is conducive to improving the soil temperature, the width of the beds is 1-1.2 meters, the width of the beds is 0.8-1 meters, the height of the beds is 8-10 centimeters, the sowing width is 7-8 centimeters, the soil is covered with 1.5 centimeters after sowing, the sowing amount per mu is 2500-3000 grams, and the seedlings emerge 6-7 days after sowing. Fourth, management after the emergence of strengthen management, early temperature is relatively high, late temperature is low, temperature control in 17-20 degrees, more than 28 degrees, because higher than 30 degrees on the growth is unfavorable, at this time, photosynthesis reduced or stopped, growth is affected, thin leaves, fiber increased, quality is not good. The minimum temperature should be controlled above 12 degrees. Below this temperature, attention should be paid to cold protection. Cold protection facilities should be added to avoid freezing or freezing. Seedling due to cold season, generally do not water, promote deep roots, and humidity, low temperature, easy to occur damping-off disease. When growing 8-10 leaves, choose sunny and warm weather to irrigate the first time, combine watering to chase fertilizer, and chase ammonium sulfate 15-20 kg per mu. Watering 2-3 times in the growth period, watering in sunny and warm weather in the morning, the water volume should not be too large, the humidity should be controlled below 95%, if the humidity is large, the sunny day should be selected for high temperature and noon ventilation to prevent diseases. Chrysanthemum grows in greenhouse. Due to weak light, low temperature and high humidity, it is easy to have damping-off disease, leaf blight and downy mildew. It should be controlled in time after onset.