The construction speed of the engineering robots is quite fast, and after they are at full power, the frame structure of the small agricultural area quickly appears below sea level. The rest of the interior needs to be done in the air, and the soil needs to be nutrient-oriented, and these steps are carried out in the sea, and the result is only a large piece of saline land.

So after letting the children play enough, the city in the sky slowly rises into the sky, and the students continue to class, in fact, no matter where the attached primary school floats, the children actually don't feel it at all, if they don't look at their own positioning, they can't find that they have gone to the sky, shoulder to shoulder with the sun.

When the city in the sky rises into the air, the construction robots begin the transformation of the agricultural area. Although the black soil in the Northeast is very fertile, it still needs to be transformed. Small-scale agriculture is very productive, so it needs a lot of nutrients, and if the soil is not modified, the soil will become desertified.

The process of transformation is not fantasy at all, not science fiction at all - the engineering robot is like an old farmer carrying a watering can and begins to spray nutrient solution on the ground, these nutrient solutions are the crystallization of future science and technology, as long as they are sprayed on the ground, they can quickly take effect and provide surging nutrients for plants.

These nutrient solutions are formulated from pure energy, which comes from the fuel tank of Sky City. In the future, humans will be able to make stellar energy harvesting umbrellas, which can perfectly convert the heat energy of stars into pure energy blocks, which can be used for many purposes, such as maintaining spaceship flight, mecha combat, and promoting plant growth.

What does the growth of plants depend on? Everything grows on the sun! The energy block directly purified by solar energy is the best catalyst for plant growth!

After the soil modification is completed, the engineering robot begins to sow plant seeds, which are genetically selected super seeds, which have not undergone any genetic mutagenesis, and are the most primitive seeds, with absolutely no risk of transgenic.

The risk of genetically modified organisms has been discovered in the future, because in the future with the further development of genetic engineering, human genes will also appear unstable, and genetically modified foods can amplify this unstable factor and make human beings abnormal. Therefore, the use of any genetically modified technology is prohibited in agriculture in the future.

After the seeds were sown, the engineering robots lined up in a neat queue and walked back to the underground factory attached to the small school.

Although it is an exaggeration that dozens of agricultural planets can supply food to tens of thousands of administrative stars, it is not an impossible thing, the degree of mechanization of agricultural stars is very high, and farmers do not do anything else every day except programming, and it is robots that really contribute to the field.

These agricultural robots do not look humanoid, they are super agricultural machines integrated with various agricultural machinery, the automation of these agricultural machinery is very high, they will automatically deal with it according to the growth of plants, whether it is pests and diseases or lack of fertilizer, they will be perfectly solved.

In just half a day, the agricultural foundation of the attached small school has been established, and as long as we wait for the harvest of these plants, the attached small school will have enough food and vegetable supply. The underground of the agricultural area is the storage area, the land of the sky city is very precious, the ground space is even more precious, the land use of the sky city is very three-dimensional, and the thickness of one kilometer underground can provide a huge building space for the sky city.

The function of the storage area is to store agricultural products and industrial products, and the output of the agricultural area can be stored in the storage area in addition to the canteen and living quarters attached to the small area. The storage method of the storage area is not the general sense of quick freezing, the storage method of the storage area uses a full vacuum or pure environment to prevent the damage of the goods, the biggest advantage of this storage method is that it is economical, as long as the warehouse is not stuffed, there will be no decay.

However, no matter how large the warehouse volume is, it is not unlimited, and the small agricultural area with it is almost infinite output, so no matter how large the warehouse is, it can't hold so many things, and Hao Yun must find a market for his agricultural products.

The agricultural area is not only a planting area, the breeding area has also been built under the power of engineering robots, but because there are no livestock settled, the breeding area has not started to work, and now only the planting area has been started.

Hao Yun needs to find high-quality breeds to fill the gap, and the breeding area can perfectly breed any kind of animal, not to mention livestock, poultry, and if Hao Yun is willing to breed - he can even breed giant pandas. The premise is that he can get the male and female bodies of the giant pandas.

The breeding area is said to be an agricultural area, but if it is used to protect animals, its effect will make the Wildlife Conservation Association cry!

The livestock and poultry raised in the breeding area taste very good, because they simulate various scenes suitable for animal life, such as mountains, forests, grasslands, etc., so that these animals feel that they are living in the wild. The taste of the so-called wandering chicken and wandering pig cannot be compared with the small corral, and the small breeding livestock has always felt that they are wild animals in their subconscious!

In addition to the livestock breeding area, the seafood and aquaculture area has also been successfully completed, this time the small dive caught a lot of seafood in the sea, these seafood will be automatically transferred to the marine aquaculture area to become seedlings, and after a certain period of time, these outputs will fill the gap in the attached canteen without seafood.

In the war years, the city in the sky is definitely the best fortress of war, because you can't besiege it with a food cut. There is no way, this sky city can be self-sufficient in both drinking water and things, as long as it is not exhausted of energy, this sky city can be maintained forever.

The core of the Sky City is the energy center, where the energy center is located is the underground of the attached primary school building, and the energy center stores a huge amount of energy blocks, which are condensed by the energy collectors on the periphery of the Sky City to collect the sun's energy, and its purity is nearly 100%.

If the energy center of Sky City is destroyed, the entire Sky City will no longer be able to fly, and can only find a place to make an emergency landing. Energy determines everything, and the future interstellar war is simply fought on energy - energy is the most basic element of human life, without energy, human beings cannot even survive.

The agricultural area attached to the elementary school is now basically completed, and Hao Yun has also returned to the sky above the seven cities in the sky city - because the children are going on vacation! Although the attached primary school is a boarding school, the children also have their own holidays on Saturdays and Sundays, although the children prefer to stay in school, but they also want to go home and spend it with their parents.

Thanks to the super fast flight speed of Sky City, after a few hours, they returned to the sky above the original site of the attached school, and they didn't have to think about landing, because there was already an ocean under the attached school, and if the attached small school wanted to land forcibly, the entire seven cities would have to be flooded!

Therefore, students can only use the flying boat to pick up, although the flying boat is worth 100 million, Hao Yun can still afford it.