The rapeseed angle refers to a period of time from the beginning of flowering to maturity, including flowering and pod development. There is only a small amount of vegetative growth during flowering, which is mainly caused by reproductive growth. Grasping the field management of rapeseed flowering and knotting stage is the last key to capture the high yield of rapeseed. At the flowering stage, attention should be paid to preventing nutrient deficiency or excessive nitrogen fertilizer. By skillfully applying flower fertilizer and granular fertilizer, the artificial angle can be reduced to prevent shedding, and the knot rate, seed number and grain weight can be increased, and the oil content can be increased. In addition, it is necessary to pay attention to drought and waterlogging, remove old yellow leaves in time, and prevent lodging.
The application of flower fertilizer should be based on conditions such as seedling condition and ground force. The rapeseed which has reached the autumn and winter and the spring is stable, can be applied to the flower fertilizer at the initial flowering stage, the leaves and stems are slightly faded, and the urea can be applied to 5-7.5 kg per acre or 10-15 kg of ammonium sulfate. The spring hair is better, the soil is strong enough, and the rapeseed with darker leaf color or excessive population development at the early flowering stage should be strictly controlled. Insufficient spring hair, small populations and individuals, and vegetable fields with obvious decline in flowering period, flower fertilizer should be applied early.
In the flowering period to the final flowering period, if there is rapeseed with premature aging, early flowering, and pale green leaves, foliar spray fertilizer measures can be taken before the final flowering period, and nutrients are added in time. Generally, potassium dihydrogen phosphate is used 0.3 per acre. 0.5-1 kg of urea and urea, sprayed with 75 kg of water, and sprayed 2-3 times to extend the functional period of the green parts such as the horn and the stolon, thereby enhancing photosynthesis and satisfying the need for fullness of the seeds. However, where the growth is normal and the rapeseed with tight mouth is not suitable, it is generally not suitable to apply granular fertilizer to avoid causing glutinous and late maturity.
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