Generally speaking, it needs loose soil to grow normally, so it has good fertility. Therefore, high-quality organic fertilizer is often used as base fertilizer in production. Such as decomposing chicken manure, manure, biogas slurry, grass ash, etc. Fertilizers include urea, superphosphate, ammonium bicarbonate, diammonium phosphate, potassium sulfate and other compound fertilizers and trace element fertilizers. In the early-maturing cultivation in spring, in addition to decomposing the base fertilizer, an appropriate amount of available nitrogen and phosphorus fertilizer should be applied to the base fertilizer. Topdressing is generally carried out at the early stage of flower ball formation, with available nitrogen and potassium fertilizer as the main fertilizer. Trace elements such as molybdenum and boron are usually applied in combination with base fertilizer. The advantage of applying farmyard manure is that it can reduce the possibility of trace element deficiency to some extent.

Second, the fertilization period of cauliflower

When planting cauliflower, it is necessary to have strong tufted leaves as a guarantee to obtain high-yield and high-quality bulbs. It is required to meet the demand for water and nutrients in time, so that plants can grow vigorously at the right time, and the number of leaves before heading can form enough nutrient area. Therefore, topdressing should be done in time on the premise of adequate application of base fertilizer.

1.？ Early-maturing varieties cultivated in spring: the organic fertilizer in the base fertilizer should be applied before ploughing, and the inorganic fertilizer should be applied at the whole edge or when planting in the field. Cover the small arch shed with plastic film, ditch, apply base fertilizer, water, cover with plastic film, and then plant. The plastic film has smooth contact with the ground and good heat preservation and water retention performance. Topdressing is generally carried out in the early stage of flower ball formation. Because the flower head has a short development time and requires a large amount of fertilizer, nitrogen, potassium fertilizer, or both of them can be applied with compound fertilizer (such as potassium nitrate, etc.). ) and compound fertilizer with high nitrogen-potassium ratio.

2.？ Mid-and late-maturing varieties: Because of their long growth period and large fertilizer demand, the amount and times of topdressing are more than those of early-maturing varieties except for double application of base fertilizer. The first topdressing was slow seedling fertilizer, which was carried out within 7~ 10 days after planting, and the available nitrogen fertilizer was the main fertilizer. The second time is to promote ball fertilization, usually before the formation of flower balls. This kind of topdressing is the key to ball formation, and it will also directly affect the quality of flower balls.