人们常说：“开春偷懒，油菜减产。”立春后，气温回升，天气渐暖，这时油菜生长十分快，很快由单纯的营养生长转入营养生长和生殖生长并进时期，对水、肥、气、热诸生态因子十分敏感。 一、科学施肥。开春后，油菜返青，进入生长旺盛时期，所需肥量大，从现蕾到初花的３０多天 People often say: “spring lazy, rape cut.” After the spring, the temperature rise, the weather getting warmer, when rape growth is very fast, quickly from pure vegetative growth into vegetative and reproductive growth into the period, water, fertilizer Gas, heat all kinds of ecological factors are very sensitive. First, scientific fertilization. After the spring, rape green, into the period of vigorous growth, the amount of fertilizer required, from the bud to the beginning of more than 30 days