Why can t the plants grown on the space station be cultivated directly with sunlight?

Because the daylight is unstable, the space station will circle the earth in less than 100 minutes, that is to say, complete a day and night cycle in 100 minutes, and the plants will go crazy. The daytime alternation that plants experience on the earth is 24 hours, and if it is changed, the plants will not adapt to this situation, so in order to make the plants adapt to the light changes of the day, artificial lights are used to simulate the daytime changes on the earth, so that the plants "think" that they are still on the earth.

Probably because of the erratic daylight.

The space station orbits the earth in less than 100 minutes, which means that it takes 100 minutes to complete a day and night cycle, and the plants will go crazy. The daytime alternation that plants experience on the earth is 24 hours, and if it is changed, the plants will not adapt to this situation, so in order to make the plants adapt to the light changes of the day, artificial lights are used to simulate the daytime changes on the earth, so that the plants "think" that they are still on the earth.

If you can't use sunlight, the space station will alternate day and night for 100 minutes, so that if you shine frequently, and then you don't shine, the plants will definitely not grow well, so you will use artificial lights.

Whether it is ordinary plant planting using sunlight or "special environment" plant planting using artificial plant light, the bottleneck is not the acquisition of light source, but the utilization rate of light energy by plants and the growth rate after absorbing energy.

According to my own speculation, it may be because the daylight is unstable, and the space station will circle the earth in less than 100 minutes, which means that if you complete a day-night cycle in 100 minutes, the plants will go crazy. The daytime alternation that plants experience on the earth is 24 hours, and if it is changed, the plants will not adapt to this situation, so in order to make the plants adapt to the light changes of the day, artificial lights are used to simulate the daytime changes on the earth, so that the plants "think" that they are still on the earth.

The astronauts said that although the food on it was okay and the environment was good, the relatively high carbon dioxide concentration and not very pleasant smell in it were still easy to make people uncomfortable. Living in such an environment for a long time can still make it uncomfortable for astronauts who have undergone rigorous training. So at this time, if there are some fresh vegetables, or live plants growing, this is very helpful to relieve the pressure of life in space.

Plants photosynthesize through light, which absorbs carbon dioxide and releases oxygen. Irradiating plants with artificial lights is done to allow plants to photosynthesize.

The space station doesn't have big enough windows to let in enough sunlight. Cupola This observation chamber offers a 360-degree view of the Earth, as well as an 80-centimeter-wide main window, the largest window ever used in a man-made spacecraft. The strength of the spacecraft requires that the openings be as small and as few as possible, but the growth of plants cannot be separated from sunlight, so artificial lights should be used instead of sunlight.

Because of the limited space in the space lab, the plant must be grown vertically and with artificial light as a light source. Artificial light vertical cultivation is the agricultural model of the future era, especially when human beings obtain independent energy sources that do not rely on the sun (such as controlled fusion), human beings will be able to use this technology to live away from the sun's light without starvation, and it will be more sci-fi here, human beings will be able to live in any willful place, such as Antarctica, deserts, the bottom of the sea, underground, and even alien regions without enough solar light (such as Enceladus).

At present, oxygen and water in the space station are regenerated by physical and chemical means, and plants produce some oxygen and absorb carbon dioxide (plants with high yield and high oxygen production also need to be strictly screened), which is also one of the means to use the ecosystem to ensure the life of astronauts in the future, which is green and environmentally friendly, and our country has also carried out a lot of work in this regard.

To put it bluntly, the International Space Station is a scientific experiment platform built in the space environment, and the research of this platform is not limited to astronomy, physics and other majors, but also includes medicine and biology. For plants grown on ISS, the main function is to meet the needs of scientific research. These include the effects of the space environment (weightlessness, atmospheric composition, radiation, etc.) on plant growth.

These unsimulating environments on Earth have the potential to allow scientists to observe features that would otherwise be missed in a traditional environment.

If we can breed several genetically modified plants, we can use a large proportion of light energy, say 60% of the light energy, and absorb this light energy to grow at three times the rate of other ordinary plants, then not only can the food problem of astronauts on the space base be solved, but even the problem of arable land for humans on Earth can be solved.

No, the conditions don't allow it.

That's right, it's true.

This is mainly due to the fact that the root system of the flower is injured during transplantation, resulting in the inability or insufficient delivery of water. If there is enough sunlight and transpiration accelerates, the plants will wilt due to dehydration, leading to wilting and even death.

Positive flowers: Most flowers such as moonflower, jasmine, peony, pomegranate, etc., they need sufficient sunlight, this kind of flower is called sun-loving flower. If the light is insufficient, it will grow and develop poorly, develop late or can not develop, and the flower color is not Buddhist legend, canna is the blood that flows out of the toes of the Buddha into fresh, the aroma is not strong.

Negative resistant flowers: hosta flowers, hydrangeas, rhododendrons, etc., only need weak scattered light to grow well, called negative resistant flowers. If they are exposed to the sun frequently, they will not grow and develop normally.

Extended information: The transplanting period is determined according to the crop type, suitable seedling age and stubble, generally the leaf age index of rice is 40%-50%, cotton is transplanted with 2-4 leaves, and corn is the most suitable for 25-35 days after emergence.

When transplanting, it can be with soil or without soil, and transplanting with soil hurts less roots, which can shorten the seedling period and live early and emerge early. Before transplanting, water and moisten, so that it does not hurt the roots or has little damage to the roots.

When transplanting, the row plant spacing is determined according to the planned specifications, and the transplanting depth is determined according to the crop type and seedling size, the general depth is about 3cm, and the depth is required to be consistent, and it is best to transplant the seedlings in different levels, and need to be fertilized and watered in time after planting to promote survival and seedling growth.

That's right. This is mainly due to the fact that the newly transplanted flowers have just left the soil, and the body is in a state of lack of water, and they are placed in the new soil, and the water has not kept up.

1. How long can I get in the sun?

After transplanting, the plant is still relatively fragile, has not adapted to the growth environment of the new pot, can not immediately move out to bask in the sun, need to wait for 3 to 5 days before taking out the sun, before this can be placed in a semi-shaded and ventilated place.

After the plant adapts to it, it is best to contact the sun's rays every day, in the native environment, it will be exposed to 3 to 4 hours of light every day, but if you breed at home, 2 hours of light time can be satisfied, but in the summer, when the sun is more scorching, you need to shade it, and you can't directly expose it to the sun.

Second, the steps of transplanting.

1. Choose a flower pot with good air permeability, such as a clay pot, and it is best to leave a small hole at the bottom to facilitate the discharge of water.

2. Take the pot upside down, take the plant out of the original pot, the action should be light, if it is a large flower pot that is not easy to operate, you need to use a shovel to scratch it on the outside, take it out slowly, and do not damage the root system of the plant.

3. Transplant the plant into a large pot, place it in a ventilated place, wait for 5 to 7 days, and then water it.

Blue-violet light promotes the electron transfer in the chloroplasts of plants, so that plants can convert the energy in sunlight into bioenergy, so as long as there is light in the frequency band required for plant photosynthesis.

The main source of photosynthesis in plants is blue-violet light, but recent studies have shown that some plants can also use orange-yellow light. The artificial sun can control nuclear fusion, which uses the energy released by nuclear fusion, and transforms it into a form that can be used by humans through thermoelectric conversion and other means. Biological experiments have also confirmed that the use of light to irradiate plants can also improve the yield of plants, so the use of controlled nuclear fusion (artificial sun) can make plants photosynthesize.

The plant growth experiment in the International Space Station and China's Tiangong-1 manned experiment is to plant the plant in a small box, irradiated with blue-purple lights, and successfully grow "space plants", they have undergone the harsh environmental test of space, and some changes will occur, and after being brought to the earth, it is possible to obtain a new variety with high yield through trial planting, multi-generation selection, hybridization, etc., or directly bring the seeds to space, and bring them back to the earth after being irradiated by cosmic rays, that is, space breeding.

However, the artificial sun probably cannot be directly used for lighting, when controllable nuclear fusion occurs, the internal high-temperature plasma is very thin, although a large amount of energy is released, but the energy density of light may not be large, and because of the neutrons released during the reaction, there is a certain destructive effect on biological tissues, and the gain of "roasting" dead plants outweighs the loss. Whether the artificial sun can make plants photosynthesize needs to be determined from the material of the artificial sun itself, to be precise, what can be called an artificial sun must be able to make plants photosynthesize, but if the light energy intensity is not enough to support photosynthesis, the effect may be exceeded by the respiration of the plant itself, and no longer carry out photosynthesis beyond the standard line.

OK. The principle of the artificial sun is the same as that of the sun, both of which produce a large amount of light and heat through nuclear fusion reactions, but the volume of the artificial sun will have certain limitations.

Biological experiments have also confirmed that the use of light to irradiate plants can also improve plant yields, so artificial suns can make plants photosynthesize.

Yes. Because artificial sunlight can also emit light and heat, the essence of the sun is the same, so artificial solar energy enables plants to photosynthesize.

Not necessarily, plant photosynthesis is the conversion of light energy, and this light energy does not have to be sunlight, it can be artificial light. The role of artificial light is definitely inferior to that of sunlight (the wavelengths of violet and red light in artificial light are more suitable for plant photosynthesis). But sunlight changes with the seasons, and artificial light doesn't necessarily change with the seasons.

If there is more artificial light, it is recommended to move out to absorb the sunlight.

Sunlight is a kind of stray light, its spectrum band is very wide, more suitable for the growth of various plants, green plants will reflect the green light source So, green light can not be used for green plant photosynthesis (because it is reflected by green leaves can not participate in the chemical reaction), plants absorb light to participate in the chemical reaction, generate their own nutrients, release oxygen, light plays a role is only a catalyst that catalyzes the activity of enzymes, so no matter what light can be, as long as it can participate in the activities in the body. (Reflected ones don't count).

No, as long as it's visible.

You can refer to the introduction of these two pages:

It doesn't have to be sunlight, we usually say that plants grow by the sun because sunlight is a kind of stray light, its spectrum band is very wide, more suitable for the growth of various plants, in fact, you should see a lot of laboratories in order to cultivate plants as soon as possible are using artificial light sources in the cultivation, for example, our school is like this, we are an agricultural university, it is recommended that you go to the local agricultural university for a field trip, you will have a harvest!

The most needed (and key) for photosynthesis by plants are red light and blue-violet light, which I heard about in CCTV's "Into Science". In other words, if you shine it with a red light and a blue-purple light, the plant will also photosynthesize. In that issue of "Into Science", an experiment was shown in a large canopy that used only purple light bulbs to illuminate the growth of eggplants.

No, as long as the bu is green.

That's true.

Because the newly transplanted flowers have just left the soil, the body is relatively short of water, and the root system is inevitably damaged during transplantation, and the water absorption ability is weakened.

That's right. This is mainly due to the fact that the newly transplanted flowers have just left the soil, and the body is in a state of lack of water, and if they are placed in the new soil, the water has not kept up, and if they bask in the sun immediately, they will be easy to not survive.

Of course, there is such a saying

I heard the flower keeper say that the newly transplanted flower has just left the soil, the body has been short of water, put it in the new soil, the water has not kept up, if you will let it soak the sun, he must hang up

Can freshly planted rose seedlings bask in the sun?

Plants need sunlight to grow for the following reasons:

1. Photosynthesis requires carbon dioxide, and in the absence of carbon dioxide, plants cannot produce photosynthesis products (starch), indicating that carbon dioxide is the raw material for photosynthesis;

2. Photosynthesis requires water. The oxygen released by photosynthesis comes from the water involved in photosynthesis, which indicates that water is also an indispensable raw material for photosynthesis. Therefore, through photosynthesis, green plants can synthesize starch and release oxygen from absorbed water and carbon dioxide.

There are also many species of mosses, ferns, gymnosperms, and quilts in plants. Generally speaking, plants are producers and are self-sufficient in light and chemical energy. But in general, plants need sunlight.