How deep is the best onion seed? When is the best time to plant onions

The depth of 2-3 cm is the most suitable for onion seeds, if the sowing is too deep, it will lead to the deformity of the plant, and if the sowing is too shallow, it is easy to have poor growth and short plant shape, in addition, when planting onions, the soil is deeply ploughed and fertilized, and then evenly spread on the soil surface with a plant spacing of 10 cm.

The depth of onion planting 2-3 cm is the most suitable, if the sowing is too deep, it will lead to the deformity of the plant, and if the sowing is too shallow, it is easy to have poor growth and short plant shape, in addition, when planting onions, the soil is deeply ploughed and fertilized, and then evenly spread on the soil surface with a plant spacing of 10 cm.

Onions are suitable for shallow cultivation at an optimum depth of 2 3 cm. If the planting is too deep, the leaf growth is too vigorous, and the neck of the bulb is thickened, especially in the case of heavy soil, it is easy to make the bulb develop deformities and cause yield reduction.

Onions are often planted by sowing seeds, and the planting time is generally concentrated in early September in autumn, when the surrounding temperature is suitable, which can be conducive to the growth of onions in the later stage.

In order to improve the germination rate of seeds, it is best to do a good job of germination treatment first, or you can sow seeds directly. First, soak the seeds in warm water to absorb water, then dry the seeds slightly and wrap them in moist gauze, put them in a warm place to germinate, keep the temperature at about 25, and sow them after most of the seeds are exposed.

Choose a sunny, leeward, drainage and irrigation convenient plot, for furrow fertilization, furrow height is about meters, width of about 28 cm, the furrow seedlings are loosened, and the rotten base fertilizer is applied.

Water enough on the furrow, spread the seeds evenly, cover with a centimeter of thin soil, cover with plastic film after sowing, keep the temperature at about 20 degrees, maintain good humidity, and germinate after about a week. After the onion germinates and emerges, do a good job in seedling management, and time seedlings and replenish seedlings to promote the growth of onion seedlings.

After the onion seedlings grow steadily, field management can be done. During the growth of seedlings, there should be no shortage of water, the amount of watering should not be too much, and the soil should be kept moist to avoid the seedlings wilting, so as to promote the rapid growth of the seedlings' roots. Good prevention and control of pests and diseases, onion common diseases include rust, purple spot, downy mildew, etc.

Correct sowing time is the key to ensure the normal growth of seedlings, improper sowing time will lead to onion growth stunted, affecting the yield and quality of onions. The time of sowing in the south can be selected in mid-September, according to the previous onion seedling situation, reasonable control of sowing, and wait until the seedlings are unearthed to check the seedlings in time to replenish the seedlings. After sowing, cover about centimeters of nutrient soil to ensure that the seedlings are ready after unearthing.

According to the characteristics of the hard skin of onion seeds, the sowing depth should not be too deep, the sowing depth is about 0.3cm, and the grass ash is sprinkled after covering the soil to keep the ground loose.

The radicle of the onion will shrink soon after entering the soil, so there is no taproot, its root is a string-like fibrous root, born at the base of the short stem disk, the root system is weak, there are no root hairs, and the root system is mainly densely distributed in the topsoil layer of 20cm, so the drought tolerance is weak.

During the vegetative growth period of the onion stem, the stem is shortened to form a flattened conical stem disk, the lower part of the stem disk is coiled, the upper part of the stem disk is ringed with cylindrical leaf sheaths and branch buds, and the lower part grows fibrous roots. The coiled heel tissue of mature bulbs shrinks and hardens, preventing water from entering the bulb.

Onion seed 5 cm is more suitable

You have to ask the farmer brothers and sisters about this kind of thing, they have a lot of experience.

Generally speaking, onions are best sown in mid-September, no earlier than September 1 and no later than October 15. All sowing at the right time is generally planted in early to mid-November, and no later than November 25. At this time, the base of the seedling stem is 0 5 cm thick, the true leaves are 3 and 4, and the seedling age is 40 days and 50 days.

It can grow 3 and 4 new roots before the soil freezes, which is conducive to safe overwintering.

1) Temperature. Onions are more adaptable to temperature. Seeds and bulbs can germinate slowly at 3 5, 12 begin to accelerate, the growth of temperature-appropriate seedlings is 12 20, leaves are 18 20, bulbs are 20 26, and robust seedlings can tolerate low temperatures of 6 7. The bulb needs a higher temperature to swell, and the bulb cannot expand below 15, and the growth of 21 27 is the best.

If the temperature is too high, it will grow and decline and enter dormancy.

2) Lighting. Onion is a long-day crop that requires more than 14 hours of sunshine during bulb swelling and flowering. Under high temperature and short day conditions, only leaves grow, and shallots cannot be formed. Onions are suitable for light intensity of 24,000 lux.

3) Moisture. Onions should be supplied with sufficient water during the germination stage, the peak growth period of seedlings and the bulb expansion stage. However, it is necessary to control the water at the seedling stage and before overwintering to prevent the seedlings from growing and suffering from frost damage. Irrigation should be controlled 12 weeks before harvest to enrich the bulb tissue, accelerate maturation, and prevent the bulb from cracking.

Onion leaves are drought-tolerant, suitable for 60% to 70% humidity, and the air humidity is too high to cause diseases.

4) Soil and nutrients.

Onion has strong adaptability to soil, and it is suitable to be fertile and loose, neutral loam with good aeration, sandy loam is easy to obtain high yield, but clay loam has full bulbs, good color and luster, and is resistant to storage. The ability of onion roots to absorb fertilizer is weak, and adequate nutrient conditions are required for high yields. For every 1000 kg of shallots, 2 kg of nitrogen, 0 8 kg of phosphorus and 2 2 kg of potassium need to be absorbed from the soil.

The application of trace elements such as copper, boron, sulfur and other trace elements has a significant effect on increasing yield, and you can choose to use Bika macro-element water-soluble fertilizer and medium and trace element water-soluble fertilizer.

The best time to plant onions is from September to October every year, when the temperature in most areas is cooler and the germination rate of onions is high. However, the planting time is different in different regions, the Northeast is generally sown directly after the soil ice melts in spring, the southern region is generally sown in mid to late September in autumn, and the North China is generally sown in early September.

Before sowing, in order to facilitate the emergence of seedlings, the seeds can be soaked in 50-55 water for 15-25 minutes, during which continuous stirring, the temperature drops to 30 and continue to soak for 8-12 hours, and then put in the condition of 25-28 moisturizing and germination, there are 1 3 seeds can be sown when they are white. Before sowing, the seedbed is thoroughly watered, the seeds are evenly sown, the sowing amount per mu is 4 kg, and after sowing is covered with sieved fine sand. Finally, cover with plastic film or straw, which is warm and moisturizing, which is conducive to the emergence of seedlings.

Onion planting depth of 2-3 cm is the most suitable, if the sowing is too deep, it will lead to the deformity of the plant, and the sowing is too shallow, and it is easy to have poor growth, short plant shape, etc., in addition to the onion seedlings in the seedling age of 50-55 days, to transplant and colonize, and in the later management, the interval of 15-20 days to apply a nitrogen, phosphorus and potassium compound fertilizer.

The depth of onion planting 2-3 cm is the most suitable, if the sowing is too deep, it will lead to the deformity of the plant, and if the sowing is too shallow, it is easy to have poor growth and short plant shape, in addition, when planting onions, the soil is deeply ploughed and fertilized, and then evenly spread on the soil surface with a plant spacing of 10 cm.

Onion seedlings are best transplanted when they are 50-55 days old, i.e. the seedlings are 25 cm tall and have 3-4 true leaves.

At this time, the seedlings are dug out of the seedling bed, and then planted in the soft, fertile and well-drained soil, and after the soil is compacted, watered to keep the soil moist.

In the process of maintaining onions, it is necessary to keep the temperature between 21-27 degrees to promote the vigorous growth of the plants, and during the peak growth period, it is necessary to water every 1-2 days, and apply nitrogen, phosphorus and potassium compound fertilizer every 15-20 days to improve the yield and quality of onions.

During the growth of onions, they are susceptible to rust and downy mildew.

Root rot, blight, cabbage insects and other pests and diseases, it is necessary to regularly check the growth of the plant, if the leaves of the disease and insects are found, spray the corresponding agents according to the type of pests and diseases, such as when infected with rust, spray propiconazole every 7-10 days.

Spray 2-3 times in a row.

1.Choose the right breed.

To grow onions, whether at home or on a large scale, it is very important to choose the right variety. In order to grow large onions, the following points should be taken into account when choosing a variety: First, the variety should be suitable for the local climate and soil conditions.

Secondly, it is necessary to choose varieties that are suitable for your own planting methods and management. Finally, choose varieties that have historically yielded and tasted great.

2.Choose the soil.

Onions should be grown on a fertile, well-drained soil, preferably with a low pH. When choosing the soil, if the soil is too acidic and alkaline, you can use lime or gypsum to adjust the pH of the soil. In addition, regular application of organic fertilizers is also a necessary step in growing onions, which can provide the nutrients that plants need to grow healthier.

3.Pay attention to the right time.

The best time to grow onions is in February and March. This is due to the fact that during this time, the temperature is suitable and the humidity is moderate, which is conducive to the growth and development of onions, and the effect of insecticidal mounds is better. If you miss this time, you can plant it again in August and September.

4.The right way to grow.

There are still a lot of details to pay attention to when growing onions. First of all, the planting depth is generally about 3-4 cm, if the soil layer is too thick, it will affect the size of the onion head during the growth process. In addition, when planting, it is necessary to pay attention to the distance between each seedling hole, which should be arranged according to the ratio of 30cm x 15cm.

After planting, it is necessary to loosen the soil regularly and weed, and spray the plants with an appropriate amount of insecticides to prevent the occurrence of pests and diseases.

5.Reasonable management measures.

In the process of growth, timely detection and prevention of pests and diseases is also a factor that cannot be ignored in the cultivation of large-headed onions. Onions should also be kept at the right humidity and temperature during the growth process. When the day is dry, water appropriately to maintain soil moisture.

At the same time, it is also necessary to prune and topping according to the growth and development situation, control the growth of the plant, and strengthen the rejuvenation.

6.Grown in an ecological way.

While planting onions in a large area, we should vigorously promote the way of ecological planting of onions, reduce or avoid the use of chemical pesticides and chemical fertilizers, and cultivate onion plants in a natural and environmentally friendly way. Ecological cultivation methods can not only improve the quality and yield of onions, but also protect the environment and provide consumers with safer and healthier food.

7.Timely harvesting and storage.

The best time to harvest a large-headed onion is when its leaves are yellow, wilted and lodging. After harvesting, the onion heads are cleaned and dried for at least 7-10 days before being stored in a ventilated, cool and dry place. During storage, it is also necessary to inspect and clean it regularly to maintain the integrity and quality of the onion head.

8.Summary. The above are some of the key points of planting big-headed onions, for friends who like to plant, in order to cultivate big-headed onions, they also need to continue to explore and practice, and constantly summarize experience and skills in the process, in order to continuously improve the planting level and achieve more harvests.

Summary. In the soil after the onion is harvested, it is recommended to grow fast lettuce-like vegetables. Since onions are grasses that leave a certain amount of pests and diseases in the soil, the next planting needs to be rotated to avoid adverse effects on the soil.

Common lettuce vegetables include rape, spinach, leeks, bok choy, mustard greens, etc., these vegetables can grow quickly, can be harvested in a short time, and at the same time have a relatively low nutrient consumption of the soil, which can restore the fertility of the soil. In addition, onions and legumes are also a good choice for planting together, such as cowpeas, kidney beans, green beans, etc., which can absorb atmospheric nitrogen, help restore the nitrogen content of the soil, and also help with soil structure.

In the soil after the onion is harvested, it is recommended to grow fast lettuce-like vegetables. Since onions are grasses that leave a certain amount of pests and diseases in the soil, the next planting needs to be rotated to avoid adverse effects on the soil. Common lettuce vegetables include rape, lead reed spinach, locust leek, bok choy, mustard greens, etc., these vegetables can grow quickly, can be harvested in a short time, and at the same time, the nutrient consumption of the soil is relatively low, which can restore the fertility of the soil.

In addition, onions and legumes are also a good choice, such as cowpeas, kidney beans, green beans, etc., which can absorb atmospheric nitrogen, help restore the nitrogen content of the soil, and also help the soil structure.

Excuse me, but please go into more detail?

In the soil after the onion is harvested, it is recommended to grow fast lettuce-like vegetables. Since onions are grasses that leave a certain amount of pests and diseases in the soil, the next planting needs to be rotated to avoid adverse effects on the soil. Common lettuce vegetables include rape, lead reed spinach, locust leek, bok choy, mustard greens, etc., these vegetables can grow quickly, can be harvested in a short time, and at the same time, the nutrient consumption of the soil is relatively low, which can restore the fertility of the soil.

In addition, onions and legumes are also a good choice, such as cowpeas, kidney beans, green beans, etc., which can absorb atmospheric nitrogen, help restore the nitrogen content of the soil, and also help the soil structure.