Rape

1. Nutritional characteristics

The whole growth stage of rapeseed is seedling, moss, flowering, corner fruit and maturity. Seedling stage belongs to vegetative growth stage, mainly root and leaf growth; The vegetative and reproductive growth stages from the moss stage to the first flowering stage are the key periods to determine the number of angular grains. From the Angle fruit stage to the mature stage, it belongs to the reproductive growth stage and is an important period to determine the grain weight. The number of plants per unit area, the number of effective corner fruit, the number of corner grain and the thousand grain weight are the components of rape yield.

2, need fertilizer characteristics

In the whole growth period of rape, the amount and proportion of nitrogen, phosphorus and potassium are different due to different factors such as soil, climate, varieties and planting methods. Yield of 150 ~ 200 kg per mu, nitrogen (N) 10 ~ 13 kg, phosphorus (P2O5) 3 ~ 6 kg, potassium (K2O) 4 ~ 7 kg.

The accumulation and storage of nutrients at seedling stage are typical characteristics of winter rapeseed under high yield conditions. The accumulation of nitrogen and potassium nutrients reaches the maximum between flowering and corner fruit stage, and the accumulation of phosphorus reaches the maximum at harvest. In the early stage, the nutrient management strategy based on "promotion" is the key to obtain high yield.

The symptoms of boron deficiency in rapeseed appear in the period from flowering to corner fruit, and there is a phenomenon of "flower and not fruiting", which leads to serious yield reduction. Early boron application at seedling or moss stage plays an important role in promoting flowering and fertilization of rapeseed and enhancing cold resistance and disease resistance. (Taken from the network, if there is infringement, please contact to delete.)

3. Fertilization technology

Base fertilizer: It is recommended to apply strong high-nitrogen special formula fertilizer (25-7-8, 20-7-8), 40 ~ 50 kg per mu.

Topdressing: For areas with high yield requirements, it is recommended to apply urea 8 ~ 10 kg in the initial mu of bolting or to apply strong high-nitrogen special formula fertilizer 10 ~ 15 kg.

It can be applied in strips, holes or scatters, and should pay attention to the separation of fertilizer and seeds in trenches and holes, and keep at least 8 to 10 cm distance to prevent burning seeds and seedlings; Spreading should be combined with ploughing into the soil.