The high-yielding cultivation of double-low rapeseed large seedlings is a cultivation technique inspired by the high-yielding cultivation technology of grafted and sparse watermelon on the basis of traditional seedling transplanting. The technology has great potential for yield increase and high yield stability. The technology is introduced as follows: 1. Early broadcast of large seedlings in due course. The reproductive characteristics of double-low rapeseed are obviously different from that of ordinary rapeseed, such as slow growth at seedling stage, late flowering and late flowering. Early timely sowing can effectively overcome the above-mentioned deficiencies and lay a foundation for the cultivation of older and younger seedlings. Mainly mid-maturing varieties were planted in early September, 10-12 days earlier than conventional cultivation. Keep the seedbed, the ratio of seedbeds to Daejeon is 1:5. 100 grams of seeds per mu of field. The seedbed is required to be fat and soil broken, and Mushi human excrement 1250 kg or three-element compound fertilizer 30 kg, calcium magnesium phosphate fertilizer 25 kg. 3 leaves before the age and time seedlings, to keep dense and thin, to maintain proper seedling density. 2-3 leaf age, depending on the seedlings pouring 1-2 times feces water and urea to raise seedlings. 5 leaves grow faster after the age, this time should take measures to promote the combination of control, on the one hand foliar spraying potassium dihydrogen phosphate plus spray Bao to promote growth, while spraying paclobutrazol (100 grams per mu, watered 30 kg ) Prevent leggy. When transplanting, rape seedlings must reach the standard of 7-8 green leaves, 25 cm seedling height, 0.7 cm thick root neck, and 40-45 days seedling age. 2, scientific fertilization won high yield. The field preparation method in Daejeon is the same as conventional cultivation. The clay soil is 1.1 meters wide and the sandy soil is 1.4 meters wide. According to the requirement characteristics of double-low rapeseed and relevant studies, it is necessary to apply 10 kg of pure nitrogen, 4 kg of pure phosphorus, and 9 kg of pure potassium for every 100 kg of rapeseed. The ratio of three elements is 1:0.4:0.9. Phosphorus and potassium fertilizers were used as base fertilizers, 60% nitrogen fertilizer was used as base fertilizer, 30% seedling fertilizer, and 10% manure fertilizer. Daejeon’s base fertilizers require 2000kg of musk pig manure, 12kg of urea, 25kg of superphosphate, 10kg of potassium chloride, and 1kg of borax. 3, big seedlings thin plant promotion Qiu Fa. In October and mid-October, transplanting plants with fertilizers will be completed by October 25 at the latest. Transplanting early, high temperatures, fast survival, conducive to autumn hair. Take a wide row of narrow planting, spacing 34 cm, spacing 18 cm, in order to reduce shade, conducive to ventilation and weeding topdressing. Big seedlings are sparsely planted and 8000-9000 acres are planted. After the planting, watering was done (Tianqing was able to use whole-field irrigation instead of watering), and on the second day, acetochlor and other preemergence herbicides were sprayed. After the live seedlings mainly attack Qiu Fa, this is the key to winning high yields. Urine was fed with urea and poured 2 times (with 3 kg of urea per acre), and potassium dihydrogen phosphate was sprayed on the leaves for 2 times. Before the end of December, the plants were required to have 12-13 green leaves, with a maximum leaf length of 25 cm and a width of 15 cm. 4, to increase the degree of fruiting. The number of pods, grains, and grain weight are the three elements that make up the yield of rapeseed. The number of grains and grain weight are affected by climate conditions, and the potential for human control is small. However, pods are the most active component of yield. Topping can promote axillary buds, which is the simplest and most effective way to increase pods. The large seedlings are sparsely planted, the plants are robust, and the middle and lower parts are well ventilated and light-transmitting, which creates favorable conditions for the hair sticking after topping. Seedlings of large seedlings and sparse transplants are old, transplanted early, and 6-8 days ahead of conventional cultivation, should be topping at 15-17 centimeters when the rape is convulsed, and 6-9 centimeters are removed. In order to promote fast and strong hair, apply fertilizer immediately after the top. Mushi 4 kg of urea plus potassium chloride 2 kg (when the rain is applied or poured into the water). 5, spray fertilizer spray catch spring tube. After spring, the fertilization is used to spray fertilizer in the spring. This will not only save the province labor, but also promote early flowering, early maturation, and prevent greed green lodging. After the beginning of spring, a mixture of thiophanate-methyl or carbendazim, potassium dihydrogen phosphate, urea, borax, and Penshibao is sprayed once at the beginning of flowering stage and flowering stage. The amount of thiophanate is 0.075 kg per acre and potassium dihydrogen phosphate is used. 0.25 kilograms, 0.5 kilograms of urea, 0.1 kilograms of borax, 5 millimeters of sprayed treasure, and 50 kilograms of water. After the initial flowering period, the root absorption capacity of rape gradually weakened, while the green leaf area is at the highest stage. At this time, the foliar spray fertilizer has comprehensive effects in many aspects, can better meet the demand of nutrients in the later period of rape, and prevent premature aging and Frigidity can also effectively control Sclerotinia that threatens rapeseed yield. More rain after the beginning of spring, should pay attention to drainage, keep the rain stopped field cool. Other management is the same as conventional cultivation. Rushan Jinguo Food Co., Ltd , https://www.jinguofood.cn