Rape flowers are bisexual and radiate symmetrically. The structure of rape flower can be divided into six parts: the upper part and yellow part of the flower are petals with ***4 petals; There is a trace in the flower heart, which is the place where stamens, sepals and petals grow, called receptacle.
Rape is not very strict with the soil. In sandy soil, clay, red and yellow loam soil, as long as the correct farming methods and reasonable cultivation techniques are adopted, high yield can be obtained. Rape can grow and develop in the range of soil pH 5 ~ 9.8.
Extended data:
Growth habit
Long-day crops like cool or warm climate. The whole growth period of rape is completed below the daily average temperature of 22℃. When the temperature is higher than 3℃, rape can germinate and emerge. Because of the climate difference between regions and the different planting seasons of rape, there are winter rape and spring rape.
When the lower limit of average temperature is 10℃ and the lower limit of average temperature in Leng Yue is -5℃, rape can still overwinter safely, and winter rape can be planted under such climatic conditions. The provinces in the Yangtze River valley in southern China are cool in winter and warm and humid in spring, which are suitable for planting winter rape.
After the middle and late maturing varieties with strong winterness emerge, they need 15 ~ 30 days of vernalization at a low temperature of about 0 ~ 5℃ to germinate, blossom and bear fruit. Winter rape is sown in autumn and harvested in late spring. Spring rape can be planted in cold areas where the average temperature in winter is 0 ~ 10℃ and the average temperature in the warmest day is lower than 20℃.