In mid-December, rape gradually entered the leper twitching stage. The bud twitching to the flowering stage is a time when the plant's vegetative growth and reproductive growth are all vigorous. It is commonly known as the double waning period. The main target of this stage is the steady spring growth and promotion of stem diameter. , Maintain more green leaves, lay a solid foundation for high yield. Rape double-fermented fertilizer absorption period, accounting for about half of the total amount of life, this time a reasonable top-dressing, can receive strong glutinous rice, increase branches, promote flower, Tim grain, full of seed effect. The main reason for the steady application of nitrogen fertilizer rape is due to improper fertilization. Winter rape generally used too much fertilizer in winter. After the temperature rose in the spring, the fertilizer effect was exerted. The rapeseed grew faster and the plant type grew stronger than normal growth. Therefore, the rapeseed spring should strictly control the amount of nitrogen fertilizer according to the previous fertilization. For early application of weak seedlings, re-application of available nitrogen fertilizer, after the "Spring" will be chasing after the application, Mushi urea 5 ~ 6 kg, so that the supply of nutrients and twitching match, turn weak to strong; appropriate delay for strong seedlings Lightly applied, when the loquat height 10 cm, Mushi urea 3 ~ 4 kg, to prevent lack of stamina, affecting the results of strong seed; for Wang Miao generally do not follow the application of quick-impact manure, only Mu Shi 1000 ~ 1500 kg of farmyard fertilizer, In order to prevent de-fertilization affect the growth of pods. The topdressing of stabilizing fertilizer should be stable. Generally, there are sufficient waxy fertilizers. Due to the low temperature in winter, the land with little effect can be used. The sturgeon fertilizer can not be applied or reduced, and it will gradually exert the fertilizer effect as the temperature rises. Potassium-fertilizer rape deficiency generally occurs in the middle and late fertility stages. The double-peak period is the peak period of potassium absorption in rapeseeds. When the potassium is insufficient in the early stage, it should be applied in the flood season in order to improve the plant's resistance and improve the resistance. Rape resists lodging, resistance to pests and diseases, while coordinating rape growth, increasing yield and quality. Generally, 5 ~ 7.5 kg of potassium chloride or 75 ~ 100 kg of vegetation ash is applied per acre. The shortage of potassium and soil in paddy fields (especially hybrid rice fields) should also be appropriately increased. The time of application is generally controlled from late February to early March. Applying phosphorus fertilizer rape is a phosphorus crop. Based on the early application of phosphate fertilizer, supplementing a certain amount of phosphate fertilizer at flowering stage can promote maturation, increase yield and increase seed oil content. Phosphate fertilizer should be supplemented by the method of applying fertilizer from outside the roots. After soaking 1 to 1.5 kilograms of water and 50 kilograms of water per acre for a day and night (2 to 3 times during immersion), the filter residue should be taken for foliar spray. It is usually sprayed twice, with an interval of 5 to 7 days. Spraying boron fertilizer in the flowering stage of rapeseed, spraying boron fertilizer solution on the leaves can prevent the occurrence of "flowering but not real" and secondary flowers, and has a significant effect on yield increase. Should be sprayed in the flood season and early flowering time, each time, 100 grams of borax can be used per mu, 50-75 kilograms of water on both sides of the spray. Borax is generally not easily soluble in water. In the preparation of boron fertilizer solutions, a small amount of warm water at 60°C to 70°C should be used to decompose the borax and then add enough water. The borax liquid should be sprayed immediately after it is properly mixed so as not to cause the recrystallization of boron to precipitate for a long time and reduce the effect of boron injection. Spraying the growth regulator Wang Miao appeared leaf drape, the organization is soft, due to reduced nutrition and resistance to reduce production. Therefore, Wang Miao must use chemical regulation, in the convulsions period, mu can be used 15% paclobutrazol 50 grams, spray 75 kilograms of water, control the height increase thick, control Wang strong, so that Wang Miao become high yield fields. In addition, when the frond grows at a high speed, in order to slow down the leaf speed and control the growth, a 0.5% solution of chlormequat may also be sprayed. Rongcheng Jingyi Oceanic Technology Company Limited , https://www.jingyifoods.cn