我国是世界油菜生产大国,常年种植面积在700万hm2,产量已突破1200万t,种植面积和产量均占世界的30%,主要集中在长江中下游地区,约占全国总面积80%以上。其前茬作物为水稻、棉花,油菜是用地养地相结合作物,与粮食争地矛盾少,有利于增加土壤肥力,油菜茬后种水稻比小麦茬后种水稻可增加产量15%,油菜已逐步发展成为继水稻、小麦、玉米、大豆之后的第五大优势作物。 China is the world’s largest oilseed rape producer. Its perennial planting area is 7 million hectares. Its output has exceeded 12 million tons. The planting area and output both account for 30% of the world’s total. The area is mainly located in the middle and lower reaches of the Yangtze River, accounting for more than 80% of the total area in the country. The former crop is paddy, cotton, rape is a combination of land-based crops, conflicts with food less conflict, is conducive to increasing soil fertility, rape stubble after the latter than the wheat stubble rice can increase the yield of 15%, rape has Gradually developed into the fifth largest crop after rice, wheat, corn and soybean.