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油菜是浙江省桐庐县主要的春花作物,由于油菜秋发栽培、撒直播栽培等技术的推广普及,极大地推动了我县油菜生产,2004年我县油菜种植面积达6530hm2。但由于2004年秋冬出现的高温、干旱天气,加快了油菜生育进程,使部分春性偏强品种营养生长期缩短,生殖生长提前进行。2004年11月初,我县部分乡镇陆续发生油菜早薹、早花这一历史罕见现象。油菜发生早薹、早花后抗寒、抗病能力明显减弱,极
Rape is the main spring flower in Tonglu County, Zhejiang Province. Due to the popularization and popularization of rapeseed autumn cultivation and direct seeding cultivation, rapeseed production in our county has been greatly promoted. In 2004, the planting area of rape in our county reached 6530 hm 2. However, the hot and dry weather in autumn and winter of 2004 accelerated the process of rape growth, shortened the vegetative growth period of some springy varieties and promoted the growth of reproductive growth in advance. In early November 2004, some townships in our county successively rape early sedge, early flowers of this rare phenomenon in history. Early rape sedge occurred, early flowering after cold, disease resistance significantly weakened, very