After the Spring, the rapeseed fertilizer should be used skillfully:
1. Stabilize the application of nitrogen fertilizer. The application rate of nitrogen fertilizer should be strictly controlled according to the previous fertilization situation. For weak seedlings, apply early, reapply quick-acting nitrogen fertilizer, apply urea 5-6 kg per mu; apply mild application to strong seedlings, apply 3-4 kg of urea per mu; for quick seedlings, do not apply quick-acting nitrogen fertilizer, only mu Apply 1000-1500 kg of farmyard manure.
2. Increase the application of potassium fertilizer. The buds to the flowering stage are the peak period of potassium absorption in the life of rapeseed. When the potassium is insufficient in the early stage, it should be added in the flood season to improve the plant's resistance to stress, improve the resistance of rapeseed to lodging and resistance to pests and diseases, and improve Yield and quality. Generally, the potassium oxide is applied to 5-7.5 kg or 75-100 kg per mu, and the application time is in the middle and late February.
3. Replenish phosphate fertilizer. Phosphate fertilizer is applied as a root-feeding method. After soaking for 1 day and night with calcium phosphate 1-1.5 kg and water 50 kg per acre, the filter residue is taken for foliar application. It is usually sprayed twice, with an interval of 5-7 days.
4. Spray boron fertilizer. In the rape flower bud period, spraying the boron fertilizer solution on the leaf surface can prevent the occurrence of "flowers and not real" and has a significant yield increasing effect. Spray one time in the flood season and the initial flowering stage, use 100g of borax per acre, and spray the front and back of the sprayed blade with 50-75kg of water.
5. Spray growth regulators. For Wang Miao, in the pumping period, 15% of paclobutrazol 50g and 75kg of water can be sprayed on the acre, and the control is high and thick, and the control is strong and strong, so that Wang Miao becomes a high-yield field.
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