寒潮中，沪郊菜农冒着风雪保供应：护好秧苗，抢收绿叶菜，给大棚“升温”……

Group 1 - The article discusses the impact of a nationwide cold wave on agricultural production in Shanghai, particularly in Jinshan District, where temperatures are expected to drop to -7 degrees Celsius, posing significant challenges to farming [4] - A warm action plan is being implemented to protect the city's vegetable supply, involving high-tech seedling bases and cooperative vegetable production [4][6] Group 2 - Shanghai Hanyi Agricultural Technology Co., Ltd. is operating at full capacity in its seedling greenhouses, utilizing heating equipment and supplemental lighting to create a stable environment for over 10 million spring seedlings [6][8] - The facility has upgraded its physical cold protection measures, including double-layer insulation and an integrated monitoring system to manage temperature, humidity, and light [6][8] Group 3 - Farmers in Zhu Jing Town are actively harvesting various leafy vegetables across more than 200 acres to ensure fresh produce reaches the market despite the extreme cold [10] - The cooperative is implementing a detailed harvesting plan based on the growth cycles and cold resistance of each vegetable type, ensuring quality and continuous supply [10] Group 4 - The Zhu Jing Town Agricultural and Rural Service Center plays a crucial role in coordinating responses to the cold wave, providing timely warnings and technical support to farmers [12] - The center has organized agricultural technical service teams to offer on-site guidance and monitor the implementation of cold protection measures [12]