浙江省冬季经常多雨,间断出现“烂冬”情况(冬作生长期间降雨量可达700—1000毫米),田湿、土烂,严重影响冬作生长。杭、嘉、湖水网平原地区农民在冬作田内开设暗洞(深40厘米,间距2米),暗沟(深60厘米,间距4—8米),暗管(深80—100厘米,间距10—15米),以改善土壤内部排水条件,取得明显增产 Zhejiang Province is often wet in winter, with intermittent “rotten winter” conditions (up to 700-1000 millimeters of rainfall during the winter growing season). Wet fields and rotten soil affect the winter crop growth seriously. Hangzhou, Jia, Lake Network Plain farmers in the winter to open a dark hole in the field (40 cm deep, spacing 2 meters), undergrowth (60 cm deep, spacing 4-8 m), dark tube (80-100 cm deep, spacing 10 -15 meters), in order to improve the drainage conditions within the soil, and achieved significant yield increase