The onion fertilizer requirement
Before winter, because the temperature is lower, the growth of seedlings is small, and the amount of fertilizer needed is also small. Therefore, in the case of applying base fertilizer to seedbeds, it is generally not necessary to apply fertilizer. Excessive fertilizer will result in leggy seedlings, which is not conducive to wintering. From the winter to the green, the seedlings are basically in hibernation due to minimal growth, and the amount of fertilizer needed is also very small. After returning green, the seedlings enter into a prosperous period and last for 80-100 days. It is a crucial period for cultivating strong seedlings for winter onions. For the production of green onions, it is the key period for yield formation, and the amount of fertilizer is greater. After the planting of Daejeon, it enters the formation of light blue, and the initial growth is in the recovery stage. The amount of fertilizer is small. After the cool autumn, it enters a vigorous growth period. The amount of fertilizer absorption is the most. It is the season when winter onions are produced, and it is also a critical period for fertilizer and water management. At this point should prevent excessive fertilization, otherwise it will affect the storage performance of winter onions.
Welsh onions are more fertile, very sensitive to nitrogen, and there is a significant increase in nitrogen fertilizer application. The maximum nutrient uptake was potassium, followed by nitrogen and phosphorus, and the ratio of N:P2O5:K2O was l:0.4:1.3. In addition to nitrogen, phosphorus and potassium, nutrient elements such as calcium, zinc, manganese, boron, and sulfur all have a certain influence on the yield and quality of Welsh onion. Fertilizers containing these elements are usually added to increase the growth of light blue, thereby increasing yield and taste.
Scientific Fertilization Technology
1. Apply base fertilizer: Welsh onion requires deep soil, water and fertility fertile soil. Due to its long growth period, it is necessary to perform multiple top dressings at different growth stages in addition to sufficient base fertilizers. The onion fertilizer is divided into two parts: seedbed fertilization and field fertilization. Seed bed fertilization is mainly based on basal fertilizer. Each mu of compost compost or fertilizer 3000-4000 kilograms, superphosphate 30-40 kilograms, potassium sulfate 20 kilograms or plant ash 100 kilograms, spreading and ploughing into soil before site preparation, and then shallow plowing耙 Let the organic fertilizer mix well with the soil.
2. Applicable top dressing: Before and after the beginning of autumn, the first topdressing fertilizer is applied with 30 kg compound fertilizer and 5 kg urea per acre; the second fertilizer is applied at the end of August, and top dressing compound fertilizer is 20 kg per acre. 75 kg; the third time in the late September, top-dressing compound fertilizer 25 kg/acre and 12 kg urea.
3. Foliar spraying potassium: In order to strengthen the disease prevention ability of onion seedlings, it can be used to add potassium fertilizer by foliar spray water solution, and 8 kg of ash per acre is dissolved in 15 kg of water, and the filtrate is mixed with 150 kg of water and foliar spray. Spray once every 7-10 days, spraying 2-3 times continuously. It can also be sprayed with 0.2% potassium dihydrogen phosphate solution, so that the growth of onion seedlings is strong and the resistance to disease and wind is improved.
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