At noon the next day, when the two young couples came out of the room, they looked at each other and laughed in unison.

This kind of simple room doesn't have any soundproofing effect, and I don't know who fired the first shot yesterday, and the people who have been carrying a belly of fire in their hearts since the end of the world have completely indulged in a night, and the sound of the two rooms is like waves.

As a result, everyone got out of bed the next day.

Zhou Xingyuan soon got into work after joining the shelter, calling Li Shuying, and the two sisters built a breeding house for the little quails and hens.

The house for the little quail is very short, only twenty-five centimeters on the first floor, a full ten floors high, a cage can raise almost one hundred and fifty quails, and the area is extremely small, it is no problem to raise a few thousand in the basement, and the cage for the chickens is relatively much larger, considering the load-bearing problem of the cage, Li Shuying tried her best to set the number of layers at four floors, the same size as the quail cage, but the capacity is only about thirty.

Taking into account the cooling effects of nuclear winter, each layer of the cage is wrapped with a thick insulation layer, on which there is a tray with a grid, on which eggs and feces will fall, and the tray can be removed and replaced at any time, and the operation is also very convenient.

Livestock manure is also a good fertilizer, but there are a lot of doorways in it, if it is not dried directly to fertilize the field, it is likely to burn the crops to death, of course, there are not so many procedures for growing mushrooms, just use it directly.

Last time, I got a complete set of automatic feeding equipment from the farm, and it took a lot of effort to move this big guy into the basement, and then I only need to change the equipment to use it for semi-automatic irrigation.

It took two days to complete such a big project, and as for what crops to plant, everyone also had a problem in their hearts.

Most crops need sunlight for photosynthesis to thrive well, but some crops can grow well and even taste better without photosynthesis.

The most typical is bean sprouts.

Bean sprouts grow fast, can be eaten in ten days, rich in nutrients, in this dark and difficult environment, can eat a bite of fresh vegetables, it is really a great happiness.

It just so happened that I got a lot of feed beans from the farm last time, some of which were used as seeds and some as bean sprouts, so as to achieve sustainable development as much as possible.

Planting bean sprouts is very simple, you don't even need soil, you only need to change the water frequently, water frequently, and you can harvest tender tofu after 15 days, but it is not so easy to grow soybeans.

Regardless of the various fertilizers needed, the soil alone is a big problem.

There are a large number of radioactive elements in the dust that drifts away after the explosion of the nuclear bomb, some elements with a short half-life may dissipate in a month or two, but most of the radioactive elements have a very long half-life, and the radiation value will be reduced to a slightly safer level one month after the outbreak of a nuclear war, but has anyone ever wondered where those large amounts of radioactive fallout go?

In fact, this is very simple, those radioactive elements are wrapped in dust, and with the rain washing, they melt into the soil, and it is unknown whether the crops grown in such soil can be eaten or not, and whether they can survive.

Planting bean sprouts this kind of work Yi Ling is also the first time to do, feeling the stones to cross the river, first changed the automatic feeding device to automatic water supply, planting bean sprouts is best to change the water in half a day, but now the water resources are very precious, can only be changed once in two or three days, and the water changed has to be used to irrigate the fungi and moisturize the planting room.

Soon you will be able to eat fresh vegetables, and everyone is very excited, more than half a month has passed since the end of the world, and all the fresh vegetables that have been looted before are rotten, and the only thing that can be eaten is dehydrated freeze-dried and pickles.

If you continue to eat like this, it won't be long before the sauerkraut and pickles will be eaten.

People are always greedy, but it is precisely because of this greed that human beings have the motivation to attack a better life.

In order for everyone to be able to eat fresh vegetables in the future, Yi Ling decided to build a vegetable farm on the ground.

This is a very large project, and the temptation of fresh vegetables has mobilized everyone's enthusiasm, and every point has been pointed out.

First of all, if you want to grow crops on the ground, you must use greenhouses to grow, when the nuclear winter comes, the ground temperature can even drop to minus ten or twenty degrees, even if it drops to minus thirty or forty degrees, it is not surprising, the vast majority of plants in nature can not survive in this extreme environment, in order to grow crops in this situation, the first consideration is the cold tolerance of the crop, as well as the warmth of the greenhouse.

The second point is that today's soil pollution is serious, and the plants that grow in the full of radioactive materials can not be eaten, whether there is harm, no one dares to guarantee, if you want to eat as little radioactive elements as possible, you can only dig deep, like digging a fish pond, digging a deep and large pit, pouring the bottom with a variety of waterproof membranes and concrete, completely isolating from the outside soil, and ensuring the safety of the soil in the pit to the greatest extent.

The third point is that you need to find enough clean soil, some crops have a demand for the thickness of the soil layer, if the soil layer is too shallow, it will not be able to grow, where to find a lot of clean soil, this is a huge problem.

Fourth, Wen has to be built on the surface, and if it is built on the surface, it cannot be as hidden as a basement, and the wealth is moving, once the greenhouse is discovered by other survivor groups, it will definitely be robbed and plundered, and before there is sufficient force to protect it, this big plan can only be put on hold first.

However, Zhou Xingyuan proposed a compromise proposal, she knew a female professor in college, and the professor's proposal was the feasibility and implementation plan of the aquaponics system, and the professor and Zhou Xingyuan had discussed the role of fish in the symbiotic system, and Zhou Xingyuan had put a lot of effort into this area, so he was quite impressed.

Aquaponics system, roughly means to artificially create a small ecosystem, in this system fish and vegetables live in harmony, in a symbiotic relationship, such as rice fish and rice fields, rice fish can eat pests, fish manure can increase fertility, so that rice grows better, and vegetable farmers can not only have a good rice harvest, but also receive fat and tender rice fish.

Zhou Xingyuan racked his brains to think of several fish and vegetables that occupy an important position in the aquaponics system, and provided some sketches and corresponding uses.

This symbiotic system is wonderful, and the fish need to be changed regularly, because the residual feces and various residues in the water body will ferment in the water, resulting in the water body is not suitable for fish to live, and if the water is not changed for a long time, the fish in it will die in large numbers.

Growing crops requires fertilizer and nutrients, and growing a plant alone without regard for the fertility of the soil will not grow well.

But when these two things that are not related to each other come together, there is a qualitative change.

The eutrophicated water body is poured into the vegetable planting area through the siphon equipment, the nutrients in the water are absorbed by the soil, and the excess water flows back to the fish pond under the filtration of the soil, and the ammonia nitrogen content in the purified water body drops sharply, so that the water body is more suitable for fish to survive, and the plants also obtain the nutrients they need, which can be described as a pair made in heaven.

The disadvantage is that this aquaponics system takes up more space, and the temperature requirements are not low, and the plants also need to photosynthesize to decompose ammonia and nitrogen in the water body.

This thing is also a big plan, in order to eat a bite of fresh vegetables, everyone is full of energy, under the command of Zhou Xingyuan, it only took one day to build this behemoth covering an area of more than 50 square meters.

This vast system can be divided into many parts, each of which can be taken apart as a single entity.

Below the equipment is a fish pond for fish farming, the main structure is stainless steel, and waterproof membrane and concrete are used to prevent structural damage and increase weight.

The top is mainly made of PVC plastic board as the structure, Zhou Xingyuan originally wanted to directly plant hydroponic crops completely soilless culture, but the technical threshold of soilless cultivation is too high, and a large amount of nutrients are needed, so he has no choice but to give up.

The whole system can run naturally without power supply, the water in the fish pond can be pumped up from below by using the siphon phenomenon, and naturally reflux through the influence of gravity, and flow back to the fish pond again, and the only thing that needs electricity is the plant fill light.

The framework of the entire aquaponics system has been set up, and it is only left to put things inside.

Because of the need to simulate the ecosystem, the fish pond is designed to be very large and deep, and the groundwater is continuously pumped up, and it is expected that it will take more than half a day to be fully pumped.

Aquaponics and aquaponics are necessary to have fish and vegetables.

Everyone briefly determined the division of labor, and finally decided that Yi Ling and Li Shuying would go to find clean soil and vegetables, and Zhang Mingwei and Zhou Xing would go fishing for fish and shrimp.