Management measures of different seasons in the production of cut rose

(1) Winter: it is mainly sunny, the light is strong, and the temperature difference between day and night is large. There will be a short period of extremely low temperature at the end of December. There is a large temperature difference between day and night in southern Jiangxi, which is good for the dry matter accumulation of cut rose flowers, which have large heads, many petals and bright colors. However, the temperature difference between day and night in the greenhouse in winter is often more than 20 ℃, and the temperature difference between day and night is too large, which will lead to blackening of petal edges and flower deformities in many cut rose varieties. The lowest night temperature for the growth of cut rose is more than 8 ℃. Too low night temperature is not conducive to the growth of cut rose, mainly affecting germination and branching, resulting in low yield. During the period from mid-December to Spring Festival every year, extreme low temperature occurs in some areas of central and northern Jiangxi, and the lowest temperature reaches-5 ℃, which is prone to frost damage to simple greenhouses with poor thermal insulation.

(2) Spring and summer: it is mainly sunny from spring to early summer, with strong light, high temperature, large temperature difference between day and night, and strong wind. It is very necessary to use natural ventilation to cool down and to add certain ventilation and cooling facilities to make the rose pass through a short period of high temperature. The high humid climate in late spring and early summer (the air relative humidity is higher than 70%) has little effect on roses that need a certain amount of humidity to grow well. Too low humidity affects the color of cut rose flowers, and even causes scorching of the outer petals of flowers, which seriously affects the quality of cut rose flowers. Through the installation of certain equipment to adjust the ground humidity and air humidity is the best solution. Practice has proved that rose can significantly improve the quality of cut flowers by increasing humidity in drier seasons. The Meiyu Festival is hot, rainy and lack of light, and the continuous rainy weather lasts for a long time, which is disadvantageous to the growth of the rose. High temperature, high humidity and low light often cause the outbreak of diseases and insect pests. Therefore, it is necessary to strengthen ventilation and dehumidification and pest control facilities.

(3) Autumn: in autumn, the temperature gradually turns cool, Rain Water becomes less, the light is sufficient, and the harm of diseases and insect pests is lighter, the climatic environment is more suitable for the growth of cut rose, and the plant grows faster, so we should pay attention to maintaining the balanced supply of water and fertilizer to ensure the high yield and high quality of cut rose; the plants that have passed the peak period of flower cutting are treated with broken branches and pruning, and organic fertilizer is applied to promote the rapid growth of cut flowers in winter. After entering the late autumn, the temperature becomes cold and the humidity in the greenhouse increases because of the low temperature at night, which is easy to induce Botrytis cinerea and downy mildew. We should pay attention to the heat preservation measures at night and control the humidity in the greenhouse at night.