Fertilization techniques for rapeseed after spring

After the beginning of spring, rape enters the vigorous period of vegetative growth and reproductive growth. It needs to absorb a lot of nutrients. Therefore, scientific fertilization should be carried out according to soil quality, climate and fertilization before spring, combined with seedling conditions.

1. Early spring fertilizer application in early spring can remedy the lack of winter growth of rapeseed, promote multi-branching and early budding. Especially for rapeseeds with insufficient base fertilizer and no wax fertilizer, supplementary topdressing in early spring is the key to high yield. Generally, 5-8 kg of urea or 10-15 kg of ammonium bicarbonate is used per mu.

2. Ingenious fertilization of rapeseed fertilization should be treated separately according to the appearance of rapeseed. For fields with weak seedlings and poor growth, reapply early, that is, when the height is about 50 cm, apply 15-20 palons of human excrement per mu, and add 5 kg of urea or 10-15 kg of 45% compound fertilizer. For fields with strong green leaves, the application of fertilizer should be delayed or less applied.

3. Foliar boron-sprayed rape is very sensitive to boron and requires a large amount. Insufficient boron supply in the soil often results in unfruitful rapeseed flowers. Rapeseed "flowers but not real" imagine that it is a physiological disease caused by boron deficiency. Applying boron fertilizer has a good yield increase effect. Apply boron to rapeseed after spring. Generally, spray once at the first flowering stage. Use 50-100 grams of borax per mu, first dissolve with hot water, and then spray 50-60 kg of water; the second spray of boron can combine with rape sclerotinia The prevention and control of oilseed rape are carried out at the same time, which can increase the yield of rapeseed.

4. Increased application of potassium fertilizer In order to improve the lodging resistance, disease resistance, and waterlogging resistance of rapeseed, the application of potassium fertilizer has obvious effects, especially for potassium-deficient soils such as sandy fields and rice fields. From late February to mid-March, it can be used for spraying with plant ash, about 150 kg per mu or 15 kg of potassium chloride.

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