After entering the spring, how to scientifically manage onions has become a general concern of many growers. So where is the spring onion tube? Regarding this issue, the reporter interviewed Ron, a senior agronomist at Yangling Qin Hongbao Agricultural Technology Development Company, and he pointed out that water and fertilizer management must be done well in spring onion planting, and later management should also be paid attention to. Scientific fertilization The first fertilization is required after turning green in spring to supplement the growth of the onion root system and at the same time lay the foundation for the vigorous growth of the aerial parts later. Fertilization should be based on fully rotted organic fertilizer, 1000 kg per mu, 20 kg of superphosphate and 10 kg of potassium sulfate in the middle. The mulching film is usually only combined with 15 kg of diammonium sulfate and 10 kg of potassium sulfate per mu. When the onion plant grows to about 10 true leaves and bulbs begin to enlarge, start to apply the first fertilizer, 3 times in a row, and apply 20 kg of ammonium sulfate per square meter. The amount of secondary fertilization should be large. When the bulb begins to swell, do not apply too much nitrogen fertilizer to avoid plant "greedy green". During the bulb expansion period, potassium sulfate should be added during fertilization at an amount of about 10 kg per acre, because the lack of potassium in onions will result in poor storability. Watering the onions planted before winter in a timely manner should be poured back into the green water in spring. The water should be poured back in time. Premature watering will reduce the temperature of the soil, which is not conducive to the growth of the onion. Too late will also inhibit the growth of the plant and dry the leaves. Sharp phenomenon. When the onion bulbs start to swell, water squat seedlings should be controlled. The length of the squat seedlings should be flexibly controlled according to the soil, climate and plant growth status. When sandy soil or the climate is dry, the squat seedling period should be appropriately shortened; It is necessary to properly extend the squat seedling period when it is rainy. The purpose is to promote the transformation of onion growth to bulb expansion, generally this stage takes about 10 days. It is generally believed that the mature tubular leaves of onions turn dark green, the fleshy leaves are thicker, the waxy surface of the leaves is increased, and the color of the heart leaves is darkened, which is a sign of the end of this period. After squatting the seedlings, watering is generally performed every 5 days to promote the rapid expansion of the bulbs. When the plants in the field are partially lodging, stop watering to prevent the bulbs from being resistant to storage after harvest. If the onion is not covered with plastic film, it must be cultivated before squatting. The number of ploughing in sticky soil is more than that in sandy soil. The depth of ploughing should be controlled within 3 cm, shallower near the plant and deeper away from the plant. After the plants were sealed, the tillage was stopped. While plowing, soil can be properly cultivated. The timely harvest is generally harvested in mid-June. The main sign of onion bulb maturation is that in the later stage of bulb expansion, there is no new leaf to fill the leaf sheath, the fake stem is hollow, and the plant is dumped from the base of the fake stem. The maturity of bulbs is related to the characteristics of onion varieties, planting time and climatic conditions. Varieties with short dormancy periods and poor storability should be properly harvested early. When half of the plants fall, they can be harvested; while mid-to-late varieties have a late harvest period, 70% of the plants fall well. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone GMP ATS Injection, Tetanus Antitoxin, Tetanus Toxoid ,Tetanus Antitoxin Injection, Antitetanus, Refined Tetanus Antitoxinsupplier in China Tetanus Antitoxin,Tetanus Toxoid,Tetanus Antitoxin Injection,Antitetanus&Refined Tetanus Antitoxin FOSHAN PHARMA CO., LTD. , https://www.fospharma.com