Overwintering Seedling technique of planting Onion

I. Technical essentials

1. The nursery bed must select the land where onions have not been planted, otherwise the death rate of overwintering seedlings will increase, which is disadvantageous to protect the seedlings and increase the yield. 2. The sowing time in the greenhouse is from August 1 to 5, and the sowing rate is more than 85%. The seed rate is 17 jin / mu. The earth seedling sowing date is August 5-10, and the sowing rate is 15 jin / mu with a bud rate of more than 85%. Save the cost of building greenhouse or rental shed; 3, spray field replenishment and water after sowing to avoid the cost of manual weeding in the later stage; 4. The standard of seedling initiation is that the diameter of leaf sheath is 6 ~ 7 mm, and the fresh weight of single plant is 4 ~ 6 grams. When the seedlings reach the seedling standard, the seedlings can be preserved. 5. The plots that have not been planted with onions are selected for overwintering and watered 4-5 days before ditching to make the soil moist. After the seedlings are raised, the seedlings are buried with picks and trenches, the length of the seedlings is 80% of the length of the seedlings (the heart leaves must be buried), the thickness of the seedlings is 2 inches, and the seedlings are covered with a thin layer of straw curtain (sunscreen leaves). When the soil freezes a foot deep, the straw curtain is thickened to more than 1 foot thick. After the Qingming Festival, remove the straw curtain when thawing. Planted to the earth when the temperature is right (mid-April). 2. Comparison of raising seedlings in winter and spring 1. No greenhouse film is used to save labor and effort because the seedling period of overwintering seedlings is from August to October, and the temperature is enough, so there is no need for heat preservation treatment, so the cost of renting or building the shed is saved. If calculated according to the rental shed, the average mu cost is 100 yuan less than that of spring sowing, and saves labor and labor. 2. The cost of manual weeding in seedling bed can be sprayed after overwintering seedlings sowing seeds, so as to save the cost of artificial weeding for 3 times because spring sowing seedlings can not be sprayed with herbicide. The average mu cost is 30 yuan less than that of spring sowing. 3. Save the cost of planting seedlings, the planting time of overwintering seedlings is early, miss the busy season of planting spring seedlings, and the labor cost of planting seedlings is 20 / 60 yuan lower than that of spring seedlings. The average cost per mu is 290.87 yuan less than that of spring sowing. 4. the selling price is high, and the surplus money is due to the high selling price of onions during the overwintering seedling period, which is 0.03 yuan higher per jin than that of spring sowing onions, and the average benefit per mu is 210yuan higher (calculated according to the yield of 7000 jin per mu). 5. The output is high, and the output of overwintering onions is about 10% higher than that of spring sowing onions. According to the yield of spring sowing onion per mu is 7000 jin, and the average per jin of onion is 0.4 yuan, the benefit per mu of overwintering onion is 280 yuan higher than that of spring sowing onion. 6. the quality of overwintering onion is good because overwintering onion is drought resistant and resistant to diseases and insect pests, so it can reduce the dosage and dosage. Therefore, compared with spring sowing onion, it not only saves labor cost, but also reduces drug cost, and improves product quality. the average mu cost is 20 yuan less than that of spring sowing onion. 7. The harvest is early and easy to sell because the overwintering onion harvest is from late July to early August, which is one month earlier than the spring sowing onion harvest, which can catch up with the good price, thus ensuring a stable harvest, which is more beneficial to interplanting other crops and making the interplanting crops high and stable yield. it is beneficial to improve the mu benefit of overwintering onion. In a word, from the above analysis, it is concluded that the benefit per mu of overwintering seedlings is at least 669727 yuan higher than that of spring sowing onions. Therefore, the overwintering seedling technology has strong advantages and great potential for development, and is expected to be rapidly popularized in the next few years. As long as the overwintering seedling technology and spring sowing seedling technology are used reasonably, the onion harvest period of the two technologies can be interspersed with each other, so that the onion price advantage can be brought into full play, and the "golden industry" of onion will bring greater economic and social benefits to the majority of farmers.