How to fertilize rape budding period?

How to fertilize rape during budding and bolting period? Please guide rape to enter the period from bud bolting to flowering, which is a period of exuberant vegetative growth and reproductive growth, which is called double exuberance. The main goal of this stage is to stabilize the growth of spring, promote stem diameter and maintain more green leaves. To lay a solid foundation for high yield. Rape absorbs a large amount of fertilizer in the double peak period, accounting for about half of the total amount of life. Reasonable topdressing in this period can achieve the effect of strong bolting, increasing branches, promoting flowers, pods and full seeds. The specific method is to apply nitrogen fertilizer steadily. In spring, the application amount of nitrogen fertilizer should be strictly controlled according to the fertilization situation in the early stage. For weak seedlings, early application and heavy application of available nitrogen fertilizer should be done after "the Beginning of Spring". Urea 5 kg-6 kg per mu should be applied to make the nutrient supply coincide with bolting and turn weak into strong seedlings. When bolting height is 10 cm, urea 3 kg-4 kg per mu should be applied to prevent insufficient stamina and affect the results of strong seeds. For prosperous seedlings, they generally do not apply quick-acting bolting fertilizer, but can only apply 1000 kg-1500 kg farm manure per mu to prevent de-fertilization from affecting pods and grains. Bolting fertilizer topdressing should be stable, generally sufficient wax fertilizer, because of low winter temperature and play a small role in the land, bolting fertilizer can not be applied or less, will be able to gradually play a fertilizer effect with the increase of air temperature. Apply more potash fertilizer. The double peak period is the peak period of potassium absorption in rape life. When potassium application is insufficient in the early stage, it should be increased in the bolting stage to improve plant resistance, improve rape lodging resistance, disease and insect resistance, coordinate rape growth, and improve yield and quality. Generally, potassium chloride 5 kg-7.5 kg per mu or plant ash 75 kg-100 kg per mu should be appropriately increased in potassium deficient soil and rape in paddy field. The application time is generally controlled in the middle and last ten days of February. Replenish phosphate fertilizer. Phosphate fertilizer should be applied in the way of topdressing outside the root. After soaking in 1 kg-1.5 kg superphosphate and 50 kg water for one day and night, the filtrate residue should be taken for foliar spraying. Generally, it should be sprayed twice with an interval of 5-7 days. Spray boron fertilizer. In the flowering stage of rape bud, spraying boron fertilizer solution on the leaf can prevent "flower but unfruitful" and the production of secondary flowers, and has a significant effect on increasing yield. It is appropriate to spray once at bolting stage and early flowering stage, each time with 100 grams of borax per mu and 50 kg-75 kg of water to spray the leaves on both sides. Borax is generally insoluble in water. In the preparation of boron fertilizer solution, borax should be dissolved with a small amount of warm water of 60 ℃-70 ℃, and then sufficient water should be added. The borax solution should be sprayed immediately after being prepared, so as to avoid recrystallization and precipitation of boron for a long time and reduce the effect of boron spraying. Spray growth regulators. The leaves of the seedlings are drooping, the tissue is soft, and the yield will be reduced due to excess nutrition and reduced resistance. Therefore, chemical regulation should be adopted for prosperous seedlings. During the bolting period, 15% paclobutrazol per mu can be sprayed with 50 grams of paclobutrazol and 75 kg of water to control height and thickening, control prosperity and become strong, so as to turn prosperous seedlings into high-yielding fields. In addition, when the speed of leaf emergence of wild-growing rape is fast, in order to slow down the speed of leaf emergence and control growth, 0.5% dwarf solution can also be sprayed once. Click to get more rape planting techniques click to get more food crop planting techniques