What is the temperature that is suitable for the growth of green onions and the most vigorous growth

The suitable temperature for plant growth is 20 25 , below 10 the growth is slow, and above 25 the plant is weak, the leaf body is yellow, and it is also prone to disease. The aboveground part is also not affected by frost damage at a low temperature of 10 °C. The minimum temperature for seed germination should be 4 to 5 degrees, but the optimal temperature should be between 13 and 20 degrees Celsius for the germination of green onions quickly.

With such a suitable temperature, in another 7 to 10 days, we will be able to see the buds unearthed.

<> grow the first true leaves.

The period before planting is the seedling stage, in the seedling stage, the plant growth is not large, but also to prevent the seedlings from growing too fast, the most important thing is to accumulate nutrients culture seconds, the temperature is required to be in the range of 7-13. In my hometown, green onions are grown in the open field, and the temperature range can range from nearly 30 degrees Celsius in summer.

Left and right, ranging from minus ten degrees to more than ten degrees in winter, are suitable. After the plant grows to a certain size, it blooms after 60 to 70 days of low temperature of 2 5 °C. In production, the phenomenon of early sprouting often occurs due to early sowing in autumn, too large nutrient area of seedlings before winter or improper management of fertilizer and water, and more nutrients are accumulated.

In alpine regions, it is safe to overwinter without covering. The cold tolerance of green onions depends on the characteristics of the variety and the accumulation of nutrients in the plant. The seedlings are too small and have low cold tolerance, but the cold tolerance of the plants that have been exercised or dormant has been significantly improved.

Green onions can tolerate low temperature of -20, green onions and chives like cold and cool, growth temperature 13 20, can withstand about 0 low temperature, above 25 high temperature and strong light quality decline, only spring and autumn growth and tillering.

Exuberant. Its ability to withstand cold depends on the characteristics of the variety and the accumulation of nutrients in the plant. Seedlings that are too small have low cold tolerance, and plants that have been exercised or are dormant have a significant increase in cold tolerance.

Therefore, autumn sowing seedlings, sowing should be early, in the weaker green onion seeds, the temperature is best around 15 25 is appropriate, if more than this range of green onions will grow slowly, affecting the growth and development of green onions.

The quality of green onion and chive likes cold and cool, and the quality decreases under high temperature and strong light above 25, and the soil layer is deep and the plant growth has an inhibiting effect, and the quality of the leaves and false stems formed is poor. Excessive water at the budding stage is easy to lodging. Moisture in the education alliance network.

But still require more potassium to prevent rooting, too low and too high for seed germination. Light, only spring, can withstand low temperature of about 0. Onions are not waterlogging tolerant, and the soil is deficient in sulfur, which is conducive to the accumulation of nutrients in the leaf sheath, and has more water requirements for drought tolerance and flowering and fruiting period.

Sandy loam soils with tubular leaves and rich in organic matter are preferred. The initial temperature of green onion seed germination is 2 5. Green onions can tolerate low temperatures of -20.

During the vigorous growth period of green onion seedlings, appropriate amount of phosphate fertilizer. Onions are the most sensitive to nitrogen fertilizers, with a light compensation point of 2500 lux. Onion has strong adaptability to the soil, so each growth and development period needs the most appropriate water, which can reduce water transpiration, the saturation point is 25000 lux, not shade tolerant, and the green onion grows vigorously at 10 20 o'clock.

However, the absorption capacity of the root system is poor, the surface is waxy, and the application of nitrogen fertilizer has a significant effect of increasing yield, so the soil moisture should be maintained at a high level. The optimal temperature for the growth of green onion leaves is 15 25 .

The most suitable temperature is 25 to 30 degrees, that is, in early summer, when the temperature is higher, the growth of green onions will become sluggish.

It is best to keep the temperature at 20 25 degrees, this temperature is the most suitable for the growth and germination of green onions, if the temperature is too low, the green onions will choose not to grow, if the temperature is too high, the leaves of the green onions will be easy to wilt.

The temperature is almost 20 to 25 degrees Celsius, and as long as the temperature is maintained, the seedlings will grow very quickly.

The most suitable temperature is 20 25. In the case of germination, it should be 13-20 degrees.

Generally speaking, it is between 13 degrees and 20 degrees Celsius, so it grows best in spring and autumn, and it is generally very easy to grow.

10. Such a temperature can promote the green onions to take root and sprout, and will make the green onions grow very fast.

The seedling stage refers to the seedling stage from the first true leaf to the planting stage. The length of the seedling stage varies depending on the sowing and planting period. Autumn replanting and seedling replanting, after the pre-winter seedling stage, overwintering stage, and regreening stage, it takes 250 280 days.

Among them, the seedling stage before winter is 40 to 50 days, and the seedling stage is as long as 8 to 9 months under autumn sowing conditions. From the appearance of the first true leaf to the overwintering, it is about 50 days long, which is the early stage of seedling growth. At this stage, the temperature is low, and it is important to prevent the seedlings from growing too large, otherwise it will reduce their ability to resist cold.

Generally, the size of the seedlings should be two leaves and one heart.

The germ absorbs water until the first true leaf emerges and is erect for germination. The seedling stage refers to the seedling stage from the first true leaf to the planting stage. The length of the seedling stage varies depending on the sowing and planting period.

The onion white formation is at its peak, and this period is called the vigorous growth stage, which takes about 60 days.

In order to ensure the rapid growth of seedlings, fertilizer and water should be attacked, but the amount of watering and fertilizer should be determined according to the specific growth to prevent the growth and lodging of onion seedlings. Fifteen days before planting, it is necessary to control the watering to refine the seedlings, and then water the seedlings after planting, after the green onion seedlings are slowed down, it has entered the high temperature and rainy season, and the growth begins to accelerate after planting to the summer, which takes 60 days. At this stage, it is the high temperature and rainy season, the plant growth is slow, the soil aeration is poor, and the root rot, yellow leaves and dead seedlings are prone to occur, so the cultivation should be strengthened.

The peak period of green onion formation is 60 to 70 days after the temperature drops to 4 5 °C after the summer.

It takes 7 or more accumulated temperature of 140 left. The suitable temperature for the growth of green onion is 7--35, and the stems and leaves grow vigorously in the temperature range of 13--25. Under 10--20, the green onion white grows vigorously, and the temperature exceeds 25 and grows slowly, and the quality of the green onion white and green leaves formed is poor. Its final height and weight depend on this period.

In order to ensure the rapid growth of green onion white during this period, it is necessary to take measures such as soil cultivation in stages, strengthening water management, and topdressing micro-fertilizer and biological fertilizer. When the temperature drops to 4 to 5, the leaf body stops growing and the green onions enter the harvest period.

The whole growth period of green onions is divided into two stages and seven periods. The two stages are vegetative growth and reproductive growth. The vegetative growth stage is divided into three stages: germination stage, seedling stage, and green onion formation stage, and the reproductive growth stage includes four stages: rejuvenation stage, sprouting stage, flowering stage, and seed setting stage.

Germination period: from sowing to the first true leaf unearthing and straightening for the germination period, under suitable conditions, it lasts 7 10 days. Seedling stage:

From the appearance of the first true leaves to the seedling stage of colonization. Seedlings are sown in autumn and planted in the summer of the following year, and the seedling period is as long as 8 to 9 months. Onion white formation period:

It took 120 140 days from planting to stop growing before winter.

At present, there are two stages, namely the vegetative growth period and the reproductive growth period, and each period also needs to grasp some different nutrients and care conditions.

It is mainly divided into two stages, one is the vegetative growth stage, then the reproductive growth stage, and then according to these two different stages, it will be divided into 7 different stages.

The growth process of green onion is: germination stage, seedling stage, formation stage, and dormancy stage.

1. Germination period

The germination period of green onion is from sowing to cotyledons, which are all germination stages. 7-10 days after the germination of the seed, the radicle stretches out, penetrates into the middle, the cotyledons elongate, and the waist arches out of the ground, that is, the "nose".

Then, the top of the cotyledons grows out of the surface, straightened, that is, "straight hook", and then the first leaf grows from the leaf outlet.

2. Seedling stage

Green onion seedling stage, seedling stage, from cotyledons straight hook to planted seedlings. It can be sown for up to 8-9 months in autumn.

Usually the seedling stage of autumn sown green onion is divided into three stages: pre-winter, winter and post-spring. In the first 40-50 days of winter, the overwintering period is 120-150 days, and the rejuvenation period is 80-100 days. During the sowing period of 80-90 days, spring-sown green onions quickly enter the vigorous growth period after emergence.

3. Formative period

The formation period of green onion is 120-140 days, which can be divided into two stages: slow seedling and summerization, the formation period of green onion and the fullness period of green onion.

4. Dormant period

There was no obvious physiological dormancy period in the dormant period of green onions, and green onions in northern China were forced to enter dormancy under low temperature conditions, and the dormant period was 120-150 days. After the temperature rises in spring, the plants begin to grow green.

The temperature suitable for the growth of spring green onions is 20-25.

The germination temperature is 13-20, the plant growth temperature is 20-25, the growth is slow below 10, the growth is weak above 25, the leaves are yellow, and it is easy to produce diseases, and it is in a semi-dormant state at 35-40, and some of the outer leaves are wilted.

Shallots. The cold-resistant wintering temperature is minus 5 degrees, in a place not lower than minus 5 degrees, can safely overwinter, and the adaptability to the environment is strong, the wintering method of large onion is determined by the planting method, the ground planting needs to be watered with enough winter water before the soil is frozen, covered with film or dry straw to keep warm winter, potted plants.

Then it should be moved indoors for maintenance, and watered every 3-5 days.

The large onion is cold-resistant minus 5 degrees, cold tolerance is strong, when it is not less than minus 5 degrees, it can safely overwinter, the best temperature for growth is between 15-25 degrees, the adaptability to the environment is strong, there are certain requirements for the soil, and the suitable chong is planted in the loose soil layer, fertile, well-drained sandy loam soil.

When planting shallots, you can scatter the bridge and overwinter, water enough winter water before the soil is frozen, cover the film or dry straw when the surface is slightly dry, keep warm while reducing the evaporation of water, and move to the indoor maintenance when potting, the temperature is controlled at about 5 degrees, watering every 3-5 days, and the water temperature is consistent with room temperature.

Before planting, the soil should be ploughed and compound fertilizer should be applied.

Dig planting holes according to the row spacing of 20x30 cm, plant full and healthy bulbs into the soil, water enough rooting water, cultivate and weed and loosen the soil during the growth period, increase the air permeability of the soil, top dressing with liquid fertilizer every 10-15 days, and water at the same time.

In summer and autumn, the large onion is propagated by dividing the plant, digging out the main bulb and dividing the bulb, evenly dividing it into 1-3 small balls, planting it into the prepared soil, watering enough water to maintain it normally, and the fast-growing bulb will bloom in the spring and summer of the next year.

Seedlings should be raised in March and April in spring, the temperature is about 25 degrees Celsius is the most suitable, and some green onion seeds of good quality should be selected and evenly sprinkled in fertile nutrient soil. Appropriate amount of organic fertilizer supplementation can germinate after a period of time.

Green onion seedlings are divided into autumn sowing and spring sowing, autumn sowing is better, more commonly used, the time is about early October, the temperature requirements are not strict, more than ten degrees on the line. The ground is leveled, raked, sown, and transplanted before and after the next year's wheat harvest.

The summer temperature is higher and the yield is also high, but it is necessary to raise seedlings in the first half of January and February, with the wind barrier and the yang furrow as the green onion seedling facility, in late April, the growers began to plant the green onions, and the green onions can be harvested from mid to late July to early to mid-August.

China Education Alliance Network: (1) Temperature. The initial temperature of green onion seed germination is 2 5, and the appropriate temperature of seed germination is 15 25, and it can germinate in 2 3 days.

The optimal temperature for the growth of green onion leaves is 15 25, and the white onion grows vigorously at 10 20, which is conducive to the accumulation of nutrients in the leaf sheath. If it exceeds 25, the growth is stunted, and the quality of the leaves and pseudostems formed is poor. Green onions can tolerate low temperatures of -20.

Onions and chives like cold and cool, the growth temperature is 13 20, can withstand about 0 low temperature, the quality decreases under high temperature and strong light above 25, only spring and autumn growth and tillering vigorous.

2) Lighting. Onions do not have high requirements for light intensity, with a light compensation point of 2500 lux and a saturation point of 25000 lux. Onions need good light conditions to grow robustly, and they are not shade tolerant and do not like strong light.

3) Moisture. The leaves of green onions are tubular and waxy on the surface, which can reduce water transpiration and tolerate drought. However, the absorption capacity of the root system is poor, so appropriate water is required for each growth and development period.

The vigorous growth period of green onion seedlings, the vigorous growth period of leaves, and the flowering and fruiting period have more requirements for water, and high soil moisture should be maintained. Green onions are not resistant to waterlogging, and attention should be paid to timely drainage and waterlogging prevention in rainy seasons to prevent roots. Excessive water at the budding stage is easy to lodging.

4) Soil nutrition. Onion has strong adaptability to soil, and sandy loam soil with deep soil layer, good drainage and rich in organic matter is preferred. The soil pH value of 6 9 7 6 is suitable for the growth of green onions, and too low and too high have inhibition effects on seed germination and plant growth.

Onion was the most sensitive to nitrogen fertilizer, and the application of nitrogen fertilizer had a significant effect on increasing yield. However, it still requires more potassium and an appropriate amount of phosphate fertilizer. Attention should be paid to the sulfur content in the green onion field, and the lack of sulfur in the soil will affect the effect of increasing yield.