油菜每个单株开花数有数百至数千朵，但菜花易脱落，一般成角率不过４０％～５０％。下面介绍防治落花的五种方法：一、松土除杂油菜返青后松土（未封行前），同时清除田间杂草、枯叶、老叶、病叶，以利通风透光，调整田间湿度和温度，防病保花。二、清沟利水田间湿度过大... Rape per plant flowering number of hundreds to thousands, but the cauliflower is easy to fall off, but generally the angle of 40% to 50%. Here are five ways to prevent and control falling flowers: First, the soil after rape rape removal greening (not before the seal line), while clearing field weeds, dead leaves, old leaves, diseased leaves, to facilitate ventilation and light, adjust the field Humidity and temperature, disease prevention and protection. Second, the Qing ditch dampness field is too large ...