近二十年来,世界油菜生产发展较快,播种面积由1948—1952年平均的517.2万公顷,增加到1972年的1018万公顷,扩大将近一倍。总产量则由281.7万吨,增加到690.4万吨,约增长了一倍半。五十年代世界油菜总产量的增加,主要是靠扩大种植面积,1962年,世界油菜种植面积为773.3万公顷,总产量418.9万吨,比1948—1952年(?)增加49.5％和48.9％,单产则停留在每公顷5.25公担左右(合每亩72斤)。六十年代以来,由于注意采用良种和改进栽培技术,总产量的增长则由于面积的扩大和单产的提高,1972年,每公顷产量为6.78公担(合每亩90.4斤),比六十年代每公顷增加1.53公担(亩20.4斤),提高约30％。 In the past 20 years, the production of rape in the world has been growing rapidly. Its sown area has nearly doubled from 5,172,000 hectares in 1948-1952 to 10,180,000 hectares in 1972. The total output increased from 2.81 million tons to 6.904 million tons, an increase of about 1.5 times. In the 1950s, the world total rapeseed production increased mainly by expanding the planting area. In 1962, the world’s canola planting area was 77.33 million hectares with a total output of 4.189 million tons, an increase of 49.5% and 48.9% over 1948-1995 (?), Yields stay at around 5.25 hectares per hectare (72 kg per acre). Since the 1960s, thanks to improved seed quality and improved cultivation techniques, the increase in total output was due to an increase in area and yield per hectare. In 1972, the yield per hectare was 6.78 km (90.4 kg / acre) An increase of 1.53 hectares per hectare (mu 20.4 kg), an increase of about 30%.