Since the winter, under the influence of rare cold weather, strawberry production in Beijing suburbs has suffered from various degrees of low temperature barriers, and the growth slowed down and the fruit ripening period prolonged. The bee activity was inhibited. Because of poor pollination, the malformation rate was significantly higher in some regions. in previous years. It is now a critical period for the flowering of strawberry and the results are reported. It is reported that there will be a cold air intrusion in the city in the near future. The majority of growers should attach great importance to the prevention of strawberry low temperature.
1. Carefully check the covering material and increase the thickness appropriately. Carefully inspect the cover film, quilts, and other covering materials for damage and cracks, and repair them if found. The greenhouses with thin walls and poor insulation should be appropriately increased in thickness, covered with rainproof membranes, or be covered with an old film between the two layers of grass to prevent the cold air from entering the shed.
2. According to the temperature changes, adjust the opening and closing time of the tuyere appropriately. After opening the haystack at the same time, open the top air outlet at the same time and close the air seal after 5-10 minutes of ventilation. If the air temperature is low during the day, delay the air opening time properly. When the temperature is lower than 23°C, close the seal and keep the temperature inside the booth at 20°C - 25 °C, appropriate to cover the insulation or grass in advance in the afternoon.
3. Focus on extreme low temperatures, artificial heating if necessary. When the temperature is too low (temperature in the room is lower than 6°C), the conditional room can use gas stoves, greenhouse “heat treasuresâ€, heating lines or lamps, etc. In case of emergency, charcoal can also be used for heating, but pay attention Keep away from plants and avoid safety hazards.
4. Observe the growth of the plants and do daily management. At this stage, we must look at the growing trend of strawberries. Irrigation should be done as little as possible. We should choose sunny mornings, reduce the amount of nitrogen fertilizers, increase the amount of phosphorus and potassium fertilizers reasonably, and achieve reasonable sparse fruiting and fruiting, and the plants will retain 6-8 strong ones. As a result, the poor growth of 3-5 fruits will not only achieve the morning market, but also reduce the impact on the second inflorescence.
5. 260-fold (3 g/mu) of spraying on the leaf surface can effectively enhance plant vigor and increase plant resistance to low temperatures.
6. Pay attention to pest control. Due to the recent low temperature and insufficient ventilation, the relative humidity in the greenhouse is relatively high, which can easily lead to powdery mildew and gray mold. In the prevention and treatment, spraying should be avoided as much as possible. Promethytia-smoke and sulfur fumigation should be selected to reduce the humidity in the greenhouse.
Xi'an Jmlai Bio-Tech Co., Ltd. , https://www.jmlaisarms.com