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First, the seedbed fertilizer. The seedbed fertilization must first apply the base fertilizer. The specific method is to apply 200-300 kg of decomposed high-quality organic fertilizer, 2 kg of urea, 5 kg of superphosphate, 1 kg of potassium chloride, and fertilizer and soil before every planting of 0.1 mu. (10-15 cm thick), mix and sown.
Second, the base fertilizer. The general principle of base fertilizer application is that the quantity should be sufficient, the variety should be complete, and the time should be right. In the day before the transplanting of rapeseed, the base fertilizer is applied, and the controlled release fertilizer is very suitable for base fertilizer application. The trace element fertilizer (boron fertilizer and zinc fertilizer) can be added, and the soil needs to be covered after the fertilizer is applied. When transplanting, it is not advisable to plant the rapeseed directly on the fertilization point. It is strictly forbidden to contact the fertilizer with the root of the rapeseed seedling.
Third, topdressing. The rapeseed topdressing is generally divided into two. The first top dressing was carried out about 50 days after transplanting, that is, before the rapeseed seedlings entered the wintering period, the urea was applied 4-6 kg/mu of urea and 4-5 kg/mu of potassium chloride. The fertilization method is to combine soil cultivation with cultivating. If no cultivating is carried out, a small ditch of 10 cm deep may be opened between the rows, and the two fertilizers are mixed and applied, and the soil is covered after fertilization. The second top dressing was applied in the moss stage after the spring, and 4-6 kg of urea and 4-5 kg ​​of potassium chloride were applied. At this point, the rapeseed has been sealed, and only the surface can be applied. Be sure to spread evenly. It is best to choose before spraying.
Note: The rapeseed seedling stage is the most sensitive period for boron. Boron deficiency in the seedling stage will cause late flowering and unreality. Even if the flowering period is chased by boron, it is difficult to remedy. Therefore, rapeseed should pay attention to the supplement of boron from the time of sowing.
There are two major types of rapeseed, namely, cabbage and cabbage. The absorption ratios of nitrogen, phosphorus and potassium are different in different types. Generally, the cabbage type is 1:0.42:1.4, and the cabbage type is 1:0.44:1.1. Slow and controlled release fertilizer has the characteristics of slowly releasing nutrients, saving time and labor, reducing fertilizer loss and improving utilization rate, and is very suitable for use as rapeseed base fertilizer. The fertilization method is roughly as follows:
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