In the spring of March-April, as the temperature gradually increases, the onion begins to turn green, and it enters a critical period of management. Strengthening spring water and fertilizer management, reasonably promoting control, and timely prevention and control of pests and diseases is the key to ensuring high onion yield. In order to allow the farmers to make better profits, the microbiological fertilizer expert Jinbao (click here for details) gave the following suggestions on the management of onions in good picking:
One, onion spring management fertilization.
After the spring return to green, a basal fertilizer is applied to supplement the growth of the onion root system, and at the same time lay the foundation for the vigorous growth of the above-ground parts. Fertilization should be based on fully decomposed organic fertilizers, with 1 ton of organic fertilizer, 20 kg of superphosphate, and 10 kg of potassium sulfate per mu. When the onion enters the bulb hypertrophy stage, the plant grows rapidly and enters into a critical period of water and fertilizer management. It should be applied 2-3 times to promote the head fertilizer, and the decomposed feces should be 50-70 kg. The midpoint of bulb enlargement is the focus of fertilization, and the amount of fertilizer should be large. Basal fertilizer has a large role in the growth of onion all year round, so the base fertilizer should be applied. In general, the use of base fertilizer should account for 30% or more of the total amount of fertilizer for the whole year. For onions, the use and absorption of fertilizers does not seem to be a significant positive relationship. In order to ensure that the fertilizer we use can be fully utilized, we recommend that farmers add a certain amount of microbiological fertilizers such as the microbial fertilizer to the base fertilizer when they are used. Auxiliary fruit tree absorption. The bacterial strains in the microbial fertilizer will decompose some of the hard-to-absorb substances in the base fertilizer, thereby increasing the nutrient content of the base fertilizer and increasing the absorption of the tree nutrients. At the same time, hormones secreted by beneficial microorganisms can also promote the growth of fruit trees.
Second, onion spring management watering.
Onions should be poured lightly once in March and April. Into the prosperous period of long leaves, appropriate to strengthen the irrigation, there are six functional leaves when pouring water once, promote the vigorous growth of the leaves, lay the foundation for bulb expansion. When the onion 8-9 leaves, to control the water seedlings to prevent the growth of plants affecting bulb expansion, the length of the seedlings, according to the soil, climate, plant growth, flexible control, when the sandy soil or climate drought, we must appropriately shorten the seedling stage The viscous soil, low-lying land, and more rain should extend seedlings. The purpose of seedlings is to promote the conversion of onion growth to bulb expansion, which generally takes about 10 days. After the seedlings are on, the onion enters into the expansion period, and is usually poured once every 5-7 days to promote the rapid enlargement of the bulbs. Watering is stopped 7-8 days before the harvest to avoid storage after the bulbs are harvested.
Third, onion prevention and treatment of spring onions often have anthrax, soft rot disease. In order to reduce and prevent the occurrence of diseases, field management must be strengthened. Chemical prevention is mainly prevention and medication is used in advance. Anthrax is a fungal disease that mainly damages leaves, stems and bulbs. At the time of onset of the leaves, spindle-to-irregular lesions appear on top, ranging from pale grayish brown to brownish, with many small black spot lesions expanding, causing the upper leaves to die. When the temperature is around 20°C, the disease becomes severe under high humidity conditions. In general white skin species are more severe than red skin species and yellow skin species. Soft rot is a bacterial disease that can develop on both bulb expansion and storage of onion bulbs. The main symptom is the softening of the base of the leaf sheath and the lodging of the outer leaves.
Four, onion spring management to prevent twitching Onion twitching in recent years more phenomenon, generally early sowing, long seedling growth period, the seedlings are easy to twitch, therefore, should be based on species characteristics and local climate characteristics, sowing time in a suitable range. Before the onion age, onion seedlings need more than 80-90 days of accumulated temperature of about 10 °C and 1300 °C. Seedlings up to 3-4 leaves, seedling height 20 cm, and pseudostem thickness 0.5 cm can greatly control the twitching rate in the second spring. Management details can be consulted: Beijing Huaxia Kangyuan Technology Co., Ltd. telephone toll-free hotline
Extended reading:
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