5 Timely shading Onion hair does not need light, and there is no high requirement for oxygen. After onion sowing, it should be timely covered with plastic or cover grass to keep the soil moist and prevent rainstorms. Sunscreen should be used where conditions permit. Conditions do not have local materials, covered with grass. According to the experience of vegetable farmers, the use of Artemisia halodendron covered wheat straw with better permeability and less seedbed contamination. Horseradish Products,Fresh Horseradish Root,Horseradish Paste,Chopped Horseradish NINGXIA KOFOLON INTERNATIONAL CO.,LTD. , https://www.kofolon.com
Tests have shown that rational fertilization and cultivation of strong seedlings are one of the key measures to increase production. The application of nitrogen, phosphate fertilizer and nitrogen, phosphorus, and potassium fertilizers to seedlings at the seedling stage can increase the average weight per plant and the root weight of the seedlings without applying the base fertilizer by 1 time.
2 According to the years of experience of the vegetable farmers, the wet sowing of onion seedlings is better than dry seeding. Bottom water filling, irrigation depth of not less than 6 cm, to meet the needs of onion emergence, halfway irrigation to make the seedbed hardened, unfavorable to the healthy growth of whole seedlings and onions.
3 The specific sowing date for proper sowing can be used as a map to determine the local sowing date due to different climatic conditions. That is, using temperature as the ordinate and month as the abscissa, use the monthly mean temperature value to draw a curve. Find the 15°C point above. Use this point to make a vertical line on the abscissa, and then to the abscissa. Pushing for 40 days is the appropriate sowing time in the local area. All regions have suitable sowing dates. This is derived from long-term production practices and should be followed but not changed at will. If sowing seedlings are sown early in the autumn, the second year may lead to early bolting and late sowing. If the seedlings are too small and the wintering is difficult, it will also have negative consequences for production, but it will not be worth the candle.
4 After soaking the appropriate onion into the water and sowing the soil, timely cover the soil and sifting with rotten farmyard manure to cover the thickness of 0.80 to 1.50 cm. The overburdened soil is easy to produce “capped seedlingsâ€, causing the onion to take root and die or not Death, but not strong growth, easy to produce lodging. Overly thick soil will also affect the whole seedlings.
6 Spraying phosphorus on foliar on-foliage shoots can promote root development. This is because onion is very slow in the process of absorbing and transporting phosphorus from the soil. According to relevant data, it takes about 3 to 4 days to run from the root tip to the tip of the leaf. Phosphate spraying on the leaf can be absorbed in one or two hours. . In order to facilitate the slowing of the rooting of the seedlings, spraying 0.2% to 0.40% potassium dihydrogen phosphate on the leaf surface of the onion seedlings 10 to 15 days before the planting can increase the rooting ability of onion colonization. This is a rewarding method that is worth promoting.
Onion seedlings key technology
1 Reasonably fertilize small onion seeds, seedling growth is slow, chord roots are short, root volume is small, and absorption and utilization of fertilizer and water is not high. Seedbed soil should be selected for loose fertility, be able to keep it moist, and have not been planted with onions and garlic within 3 to 5 years. In combination with the deep-rooted application of organic fertilizer is about 10 kg/m2, and nitrogen-phosphorus compound fertilizer is 60-80 g/m2. Mixed, leveling and practical.