Rape is planted in spring and autumn every year, among which spring rape is planted in April every year, mainly in the Yangtze River valley, and winter rape is planted in September every year, mainly in the northeast and northwest regions. Inner Mongolia has the largest planting area and is not suitable for planting rape in rainy season.
Rape has strong adaptability to soil. In the process of planting, you only need to choose a field with sunny ventilation, flat terrain and convenient irrigation and drainage. Before planting, the soil should be deeply ploughed by 20 cm to remove weeds and stones, then the decomposed farmyard manure and compound fertilizer should be applied, and the soil should be deeply ploughed again to fully mix the fertilizers.
In the process of sowing rape, you can dig a trench with the row spacing of 10 cm in the soil, and then evenly sow the seeds with full particles in the trench, cover the soil and water them. If you want to improve the survival rate of rape, it is best to sow and raise seedlings in advance, and then choose seedlings with good growth for transplanting.
Growth habit of rape
Rapeseed is a crop with long sunshine time, and likes cold 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, it is divided into winter rape and spring rape.
When the lower limit of the average temperature is 10℃ and the lower limit of the average temperature in Leng Yue is -5℃, rape can still overwinter safely, and winter rape can be planted in areas with such climatic conditions and provinces in the Yangtze River basin in southern China.
It is cool in winter and warm and humid in spring, which is suitable for planting winter rape. After the middle and late maturing varieties with strong winterness emerge, it takes 15 ~ 30 days to germinate, blossom and bear fruit at a low temperature of about 0 ~ 5℃. Winter rape is sown in autumn and harvested in late spring.