In China, the viewing time of rapeseed flowers is from the end of December to April. It can bloom in December in southern Taiwan Province. As the planting time is slightly different in different places, the flowering period will be slightly different, and with the change of climate, the before and after will also be slightly different. If it is a warm winter, the flowering period will be earlier. Here are some of the roles and uses of canola. Application value of canola. Rape flower is a small flower with four petals, a pistil, four long stamens and two short stamens, and abundant pollen. The seeds contain 35-50% oil and can be pressed for oil or used as fodder. In addition, the young stems and leaves of canola can be eaten as vegetables. Canola is one of the easiest crops to grow. Farmers often sow canola seeds on their farmland during the winter and spring fallow periods. After sowing, the yellow flowers open about two months later. The following spring, farmers plow the canola into the soil to add nutrients. The fruit that results from the blossoms is the largest raw material for edible vegetable oil in China. Since the pollen is rich in nectar, it often attracts butterflies and bugs to flutter through the flowers, thus adding color to the colorful countryside. The downside, however, is that sometimes farmers are prone to bugs in subsequent spring plowing. Oleander juice is said to have medical benefits in preventing high blood pressure, anemia and colds. Preparation is simple: one or two rapeseeds, a little apple and lemon, chop the rapeseeds and apple, put them in a blender and blend them into juice, then add lemon juice and a little honey. Rapeseed is a variety of species including the genus Brassica. All cultivated plants belonging to the genus Brassica, which belongs to the family of luciferase, are known as oilseed rape. As far as the oilseed rape grown in China is concerned, it can be categorized into three types, namely, kale, mustard and collard. Chinese cabbage is native to China and is mainly concentrated in the Yangtze River basin and the northwestern plateau. The mustard type is mainly concentrated in the northwest and southwest. Kale was introduced to China from Japan and Europe in the 1930s and 1940s, mainly concentrated in the Huanghuai and Yangtze River Basins. Oilseed rape is widely distributed in China, from Heilongjiang and Xinjiang in the north to Hainan in the south, from the Tibetan Plateau in the west to the coastal provinces in the east. According to the ecological zoning, it can be divided into two regions: winter oilseed rape and spring oilseed rape. The boundary line can start from Shanhaiguan in the east, south along the Taihang Mountains through the Great Wall, south over the Wutai Mountains to the Yellow River to the eastern foot of Helan Mountains, over the Liupan Mountains and then over the upper Bailong River to the lower reaches of the Yarlung Zangbo River, with winter oilseed rape area in the south and spring oilseed rape area in the north and west. In 1996, for example, the planting area of winter rape and spring rape in the country accounted for 93.4% and 6.6% respectively, and the total output accounted for 94.2% and 5.8% respectively.2. 2. Development of economic value of oilseed rape industry in ChinaOilseed rape is the most important oilseed crop in China, and the oil content of its seeds ranges from 33% to 50%.Since 1995, the annual planting area of the crop has been 100 million mu, and the annual output of rapeseed has reached nearly 10 million tons, which is 40% of the total output of oilseed crops.3. 40%~45% of the total oilseed crop output; it also produces about 6 million tons of rapeseed meal. The protein content of the cake is as high as 40%. The amino acid composition of rapeseed protein is reasonable, with lysine content comparable to that of soybeans, while the content of sulfur-containing amino acids such as lysine and methionine is higher than that of soybean protein. It is the largest domestic source of high-quality feed protein to be developed and utilized. Oilseed rape can be used to extract edible oil and feed, in the food industry can also be used to make margarine and artificial protein. It is also widely used in metallurgy, machinery, rubber, chemical, paint, textile, soap, paper, leather, medicine and other industries, with important economic value.