缺氮:叶片明显发黄变薄,心叶呈黄绿色,老叶黄红色,植株矮小,长势较弱,根茎发红变老。补施氮肥为主,一般每亩可用人粪料1000公斤或碳铵20公斤加水进行浇水。缺磷:长势缓慢,叶片明显变小,叶肉增厚,呈暗绿色或绿色,无光泽,叶脉边缘有紫红色斑块出现,整株油菜要比正常的少2片左右。补救措施以增施磷肥为主,每亩可用过磷酸钙15~20公斤,浸泡后取其浸出液浇施,以提高吸收利用率, Nitrogen deficiency: the leaves obviously yellow thinning, heart leaves yellow-green, old yellow-red, short plants, growing weak, rhizome reddening. Fill nitrogen fertilizer-based, generally available mu manure 1000 kg or ammonium bicarbonate 20 kg water for watering. Phosphorus deficiency: slow growth, leaves significantly smaller, thickening of leaf mesophyll, dark green or green, dull, purple edge of the vein appears plaque, the whole plant less than normal about 2 pieces of rape. Remediation measures to increase phosphate fertilizer, available per acre 15 to 20 kg of superphosphate, soaked with leaching solution after pouring to improve absorption and utilization,