How to produce a good yield of cut rose in winter

Winter is the season with a large gap in cut rose in the northern region, and the price of cut flowers is also higher in this season. Here is a brief introduction to the technical points of high yield of cut rose in winter in solar greenhouse as follows:

Take various heat preservation measures to improve the room temperature and ground temperature of the greenhouse.

First of all, it is necessary to adopt a reasonable greenhouse structure to ensure that the greenhouse can absorb solar energy to the maximum and increase the indoor temperature so that the room temperature during the day is about 25 ℃, and the maximum is not more than 28 ℃. Second, use mat, straw mat, heat preservation quilt or paper to cover the greenhouse to reduce heat consumption. Third, heating measures should be taken to increase the night temperature of the greenhouse. The night temperature is 15.5-16.5 ℃ in order to maintain the normal flower yield. Fourth, dig cold ditches. The ditch is filled with organic matter such as wheat straw and rice straw, which is covered with soil and plays the role of thermal insulation.

Second, increase the light. In winter, the light intensity in the northern region is weak, and the rose is a light-loving plant. Therefore, we should do everything possible to increase the light and promote the growth of the rose. First, choose the drip-free film with good light transmittance and keep the greenhouse film clean to enhance the light transmittance. Second, the use of reflective film, spread in the ground ridge or affixed to the back wall of the greenhouse, in order to improve the light intensity. The third is to use artificial light source to supplement the lack of light in winter.

Third, adequate supply of fertilizer and proper watering. Fertilizer is usually applied once every 2 to 3 weeks, and organic fertilizer and chemical fertilizer should be used alternately. When using chemical fertilizer, the ratio of N, P and K should be kept at 1 ∶ 1 ∶ 2, combined with foliar fertilization, spraying Yemanbao, spraying Shibao, urea, potassium dihydrogen phosphate and many kinds of trace elements. In addition, the CO2 generator is used to produce CO2 in the closed greenhouse, which makes the concentration of CO2 reach 1000ppm~2000ppm, which can obviously increase the yield and improve the quality of cut flowers.

Due to low winter temperature and plastic film mulching, evaporation and transpiration are reduced, while cut rose requires that the relative humidity in the greenhouse should be kept between 65% and 70%, so watering times should be reduced appropriately. It is generally watered with fertilization.

Fourth, break the branches and combine with pruning. Bending weak branches and blind branches can reduce the consumption of nutrients, increase the accumulation of organic matter, maintain the stability of cut flower yield and improve the quality of cut flowers. One-time pruning can also be used to increase the amount of cut flowers in a certain crop, focusing on ensuring the supply of cut flowers before the festival.

Fifth, pest prevention and control.

The main diseases and insect pests of cut rose in winter are powdery mildew, aphids, whitefly, red spider and so on. The control of powdery mildew can be sprayed with 15% Fenning 500 times or 42% Shibiqing 300 times 400 times. It is best to use chlorothalonil fumigant before the disease, or use sulfur fumigator to fumigate sulfur to kill germs in the air in the shed to achieve the purpose of preventing and controlling powdery mildew. The control of aphids and whitefly should be sprayed with 1000-1500 times liquid of 20% good winter or 1000 times liquid of 5% aphid lice net. The control of red spiders was sprayed with 40% dicofol 1000 / 1500 times or 1.8% Ji Qi mite 1500 / 2000 times.