油菜在冬前或越冬期间抽墨开花，称之为“早基、早花”，农户常误认为种子不纯。其实油菜早花原因很多，据多年观察，肥料不足，秋冬干旱高温，过早播种，苗床播种量过大，苗龄过长，栽植质量差等均会引起早美导花。一般早、中熟品种多于晚熟品种，早播的多于迟播的，苗势弱的 Rape in the winter before or during the winter pumping ink, call it “early base, early flowering”, farmers often mistakenly believe that the impure seeds. In fact, rape has many reasons for early flowering, according to many years of observation, lack of fertilizer, autumn and winter drought, premature sowing, seedbed seeding is too large, too old, poor planting quality will lead to the early American guide flower. Generally early, middle-maturing varieties more than late-maturing varieties, early sowing more than late sowing, seedling weak