How many pounds of onion per mu is the reason for the onion dry tip

If you need an idiom to describe onions, it's sad and happy. Although onions are difficult to handle and often make people cry, this still does not stop people from loving them, so more and more users are growing onions. The grower's biggest concern, besides price, is yield.

How many kilos of onion per mu?

Onion yield per mu is 6000-10000 jin, the key is good management, mainly after planting to protect seedlings to be complete, to ensure consistent growth of seedlings, late fertilizer and water management to be delicate.

Early sowing in autumn, too large seedlings or warm winter years, onion easy to trigger early bolting through vernalization, encounter this situation, can be pinched from the bottom of the flower bolt expansion. Onions found to have two heads growing in the field can remove one head and allow the other to continue growing. Do not trample onion plants during bulb expansion, otherwise it will affect the normal operation of nutrients and lead to yield reduction.

What's wrong with onion tips?

The causes of onion dry tip are divided into artificial and disease attacks. The artificial causes are mainly caused by improper management during planting, while the natural diseases are mainly gray mold and downy mildew. The following are detailed:

1. Symptoms

Gray mold dry tip: initially white spots on the leaves, mostly downward development from the leaf tip, and can extend downward 2-3 cm dry. When humidity is high, it produces a lot of gray mold on dead leaves.

Downy mildew thousand tips: leaves damaged began to produce oval or elliptical spots, yellow and white at first, then turned gray, humidity when the surface of the spots have white thin mold layer.

2. Prevention and control measures

Agricultural measures: selection of disease-free seeds or seed disinfection. Seed selection should be carried out in disease-free plots; seed disinfection method is to soak seeds in warm water at 50℃ for 30 minutes, then take them out and cool them in cold water, and then take them out for germination and sowing; rotation and rotation should be carried out. Choose sunny morning watering, timely drainage after rain. Protect the green onion as far as possible to use drip irrigation or irrigation under the film dark water. Apply more fully decomposed organic fertilizer.

Chemical control measures: steaming with smoke agent. 200g of 20% ethylene sclerotium smoke agent or 200- 250g of 15% pythium smoke agent (Sukeling) are used per mu before or at the beginning of gray mold onset, and 250g of 20% chlorothalonil smoke agent are used at the early stage of downy mildew onset. At the initial stage of disease, 250g of 15% cymoxanil manganese zinc smoke agent (Keluo) was used for smoke control in the evening, 4-5 points per mu were used for prevention, and the smoke was ignited with fire. After smoking, the smoke was sealed and smoked once every 7 days, and the smoke was continuously smoked for 2-3 times.

Onion growing conditions

1. Temperature: onion has strong adaptability to temperature, seeds and bulbs can germinate slowly at 3-5℃, seedlings grow at 12-20℃, leaves 18-20℃, bulbs 20-26℃, robust seedlings can withstand low temperatures of-6-7℃.

2, light: onion is a long-day crops, bulb expansion period and bolting flowering period to more than 14 hours of long days, in high temperature and short days only long leaves, can not form onions, suitable light intensity of 2-4 million lux.

3, water: onion in the germination period, seedling growth peak and bulb expansion period should be supplied with sufficient water, but in the seedling period and before winter to control water, to prevent seedlings from excessive growth, suffering from freezing damage, 12 weeks before harvest to control irrigation.

4. Soil: onion has strong adaptability to soil, and it is suitable for fertile loose and well ventilated neutral loam. Sandy loam is easy to obtain high yield, but clay loam bulb is full, color is good, storage resistance is good, root system fertilizer absorption ability is weak, and high yield needs sufficient nutritional conditions.

How to grow onions

1, timely watering: onion planting 20 days into the slow seedling stage, at this time can not be a lot of watering, but can not lack water, so the number of watering times to be more, but the number of watering each time to be less, the principle is not to make seedlings wilt, do not make the ground dry, in order to promote rapid rooting of seedlings.

2. Reasonable fertilization: onion should be fertilized and watered in time during the peak leaf growth period and bulb expansion period. 15 kg of diammonium phosphate, 20 kg of diammonium phosphate and 3-5 kg of potassium sulfate should be applied per mu respectively, but excessive nitrogen fertilizer should not be used.

3. Intertillage and loosening: onion seedling stage intertillage and loosening 3-4 times, combined with each watering, stem and leaf growth period 2-3 times, to stop intertillage after plant ridge closure, intertillage depth of about 3 cm is appropriate, fixed plant should be shallow, far away from the plant place should be deep.

4. Cutting flower buds: onion is cut off from the lower part of flower bud before flower bulb formation, preventing flowering from consuming nutrients, promoting lateral bud growth, forming fuller bulbs, and spraying fruit strengthening spirit at the same time, which helps to improve yield.

5, picking time: onion harvest is generally in late May to early June, when the leaves gradually begin to yellow from bottom to top, pseudostems become soft and begin to fall, bulbs stop expanding, outer leather, into the dormant stage, marking that the bulbs have matured, should be harvested in time.

It can be seen that the yield per mu of onion is still very high, of course, this has a lot to do with people's planting methods and management. Onions have a strong adaptability, but understanding their growth habits and managing them properly are also critical to achieving high yields.