Field management techniques at bud bolting stage of rapeseed

First, heavy bolting fertilizer should be applied early; second, boron fertilizer should be added. Rape is a crop sensitive to boron, which is flowering and unfruitful when boron is deficient. To spray boron fertilizer twice at the beginning of bolting and flowering, the method is to spray 100 grams of efficient instant boron fertilizer and 30 liters of water evenly each time; the third is to drain water and prevent stains; the fourth is to plough weeds and weeds; the fifth is to control and prevent lodging by chemical control; the method is to spray 40 to 50 grams of paclobutrazol wettable powder to 40 liters of water per mu; the sixth is to do a good job in pest control as early as possible in the early flowering stage.