大降温来了！主要农作物防寒技术措施请收藏

Core Viewpoint - A significant cold wave is expected to impact the region from January 20 to 23, leading to a notable drop in temperatures across various areas, necessitating the implementation of cold protection measures for major crops [2][4][5]. Group 1: Cold Wave Impact - The cold air mass will first affect northern regions on the morning of January 20, with temperatures dropping by 7-10°C in northern areas, 5-7°C in central areas, and 3-5°C in southern coastal areas [4][5]. - The lowest temperatures are anticipated around January 22, with northern areas experiencing widespread temperatures below 5°C, and high-altitude regions potentially dropping to -4 to 0°C, accompanied by rain mixed with snow or freezing rain [5]. Group 2: Crop-Specific Cold Protection Measures - Sweet Potatoes: Prior to low temperatures, irrigation should be avoided, and smoke can be generated in the fields to create a warming effect. After cold damage, specific growth-promoting agents can be applied to aid recovery [8][10][12]. - Potatoes: Management includes applying potassium fertilizer and anti-freeze agents before the cold wave, and quickly spraying water to remove frost when it arrives [14][15][17]. - Rapeseed: Pre-cold measures involve applying wood ash for heat retention and enhancing cold resistance through fertilization. Post-cold, damaged parts should be removed, and fungicides applied to prevent disease [18][23][25]. - Vegetables: Recommendations include soil moisture management, using protective covers, and ensuring proper fertilization to mitigate cold damage [30][34][36]. - Fruit Trees: Physical protection methods such as whitewashing trunks and covering roots with soil are advised, along with proper fertilization and water management to enhance resilience against cold [39][42][44]. - Tea Plants: Covering the ground with straw and ensuring adequate irrigation before cold weather can help protect tea plants. Post-cold, pruning and fertilization are necessary for recovery [53][55]. - South Medicine Plants: For root and stem types, soil management and covering with straw are recommended to prevent frost damage. After cold events, timely pruning and fertilization are crucial [58][60]. - Facility Planting: Ensuring the integrity of greenhouses and implementing effective heating measures are essential for protecting crops from cold [61][66].