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春油菜是西藏的主要油料作物,常年播种面积占耕地面积的5％左右。大面积一般亩产100斤左右,高产田块可达300～600斤以上,最高者为800多斤。西藏冠为“世界屋脊”,平均海拔4,000米以上,是地球上独特的自然地理单元。主要河谷地区气候温凉,日照充足,降水少。油菜生长期间,日平均气温一般在5～18℃之间,总日照时数800～1200小时,总辐射量80～90千卡/厘米~2,降水量200～300毫米。油菜在这种生态条件下生长发育,形成了许多区别于我国其它地区春油菜的特性特征,下面仅从生育期、粒重、含油量与增产潜力等方面作一初浅分析。
Spring rapeseed is the major oilseed crop in Tibet. Annual perennial plantings account for about 5% of the cultivated land. Large area of about 100 kg per mu, high yield plots up to 300 ~ 600 pounds, the highest for more than 800 kg. Tibet crown as “the roof of the world”, with an average elevation of 4,000 meters above sea level, is a unique natural geography unit on Earth. The main valley climate is cool, sunshine, precipitation less. During rapeseed growth, the average daily temperature is generally 5 ~ 18 ℃, the total sunshine hours 800 ~ 1200 hours, the total radiation 80 ~ 90 kcal / cm ~ 2, precipitation 200 ~ 300 mm. Rape under this ecological conditions, growth and development, the formation of many different from the characteristics of spring rapeseed in other parts of China, the following only from the growth period, grain weight, oil content and yield potential for a primary analysis.