Main points of fertilization in southern winter rape

Winter rape plants are tall, long growing, and require more fertilizer. Pay attention to the following points in fertilization:

1. For every 100 kg of rapeseed, it is necessary to absorb 8.8-11.3 kg of nitrogen, 3-3.9 kg of phosphorus and 8.5-10.1 kg of potassium. According to the target yield, combined with the soil fertility and cultivar, determine the type, quantity and application period of the fertilizer.

2. The base fertilizer of rapeseed is divided into base fertilizer and seed fertilizer. The bottom fertilizer is about 3 tons of farmyard manure, with 11-16 kg of urea or 25-27 kg of ammonium sulfate (the amount of nitrogen fertilizer is generally 30%-50% of the total nitrogen fertilizer), and the superphosphate is 20-30 kg. , potassium chloride 5-10 kg. Insufficient base fertilizer is compensated by seed fertilizer, generally using decomposed human excrement and quick-acting phosphorus and potassium fertilizer, and concentrated in the row or in the hole when the rapeseed is sowed or transplanted.

3, rapeseed topdressing is mainly used as seedlings and manure. If the bottom fertilizer is lacking, when the rapeseed grows poorly, the seedlings will be fertilized early, and the amount of topdressing will be appropriately increased. When the rapeseed seedlings are 4-5 pieces of true leaves, between the time and the fixed seedlings, 3 kg of ammonium sulfate per acre is combined with the fixed seedlings, and the manure and manure are used as the seedling fertilizer. The manure fertilizer has a great effect on promoting the growth and development of rapeseed and increasing the fruit. The bud fertilizer generally accounts for 30%-40% of the total topdressing amount. The number of seeds and the weight of rapeseed are related to the nutrient conditions in the later stage. When flowering and podping, if the ventilation and light transmission are good, without shading, 1% urea or superphosphate or potassium dihydrogen phosphate can be sprayed.

4. The requirement for phosphorus in rapeseed is less than potassium, but the reaction is sensitive. Phosphorus can promote growth and development and increase seed oil content. Phosphorus can be repeatedly used in rapeseed, and it is better to use it as a seed fertilizer or transplanting. It should be applied at the latest before 5 leaves. The roots of rapeseed have strong ability to absorb phosphorus, and the acid soils should be fertilized with calcium, magnesium and phosphorus. It is also effective to apply phosphate rock powder which is hardly soluble in water. The amount of phosphate fertilizer is generally 20-30 kg per kilogram of superphosphate or calcium magnesium phosphate.

5. When the soil is deficient in potassium and the available potassium content is lower than 90 mg/kg, the effect of potassium fertilizer combined with nitrogen and phosphorus fertilizer is obvious, while the effect of applying potassium fertilizer alone is lower. Potassium fertilizer is the best used for concentrated application of base fertilizer, with 5-10 kg of potassium chloride per acre.

6, rapeseed is sensitive to trace element boron, boron deficiency will be "flowers and not real". The rapeseed Honda applied boron, sprayed once in the seedling stage, the flood season and the early flowering stage, each time using 50 grams of borax per acre, 50 kg of water, spraying the leaves, the effect is good. However, boron must not be excessive to avoid poisoning.
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