油菜平作和垄作密度试验杨传学，张广军，王金辉，董永强（黑龙江省二龙山农场）随着油菜生产的发展，油菜菌核病越来越重，严重威胁着油菜的发展。据调查油菜菌核病与种植密度关系密切，密度过大，田间通风透光能力差，相对湿度大，菌核病发生严重。目前油菜大面积生产以... Rapeseed cropping and ridge density test Yang Chuanxue, Zhang Guangjun, Wang Jinhui, Dong Yongqiang (Erlongshan Farm, Heilongjiang Province) With the development of rapeseed production, rape sclerotinia is more and more serious, which seriously threatens the development of rapeseed. According to the investigation of rape Sclerotinia and planting density is closely related to the density is too large, poor field ventilation and light transmission, relative humidity, sclerotinia serious. At present, large-scale production of rape with ...