Big camphor tree base.

There are three or four greenhouses in the inner and outer cities.

There are one greenhouse each in the first, second and third buildings, and there is also one in the inner city.

These are the main places where crops are grown on the surface. There are also places underground, but they are mainly in the basements of residential buildings.

There is also the bunker in the Second Outer City and the cave in the mountainside.

6

There are plantings both above and below ground. Once some natural disaster occurs, it can avoid the destruction of all crops.

Before the typhoon arrived, Li Yu issued many confusing orders.

For example, the cameras were put away; the fish, shrimps and crabs collected from the mountain pond were all moved to the pond of less than an acre in the cave, and the other part was placed in the reservoir at the foot of the mountain.

........

These orders reduced losses at the Da Zhangshu base.

Just like this time, zombies were blown into the mountain pond, and the fish and shrimp inside were soaked in it. Although there is only one way for the zombie virus to spread, and it can only be through bites, if the fish and shrimp contaminated by the zombies will still cause people to

I felt so panicked.

Fortunately, Li Yu had people fish and move the fish and shrimp from the mountain pond to the reservoir and cave pool in advance, thus avoiding this situation.

The fish and shrimps in the mountain pond have always been taken care of by old people like grandpa and grandpa.

You can usually cut some weeds and throw them into the pond. If there are no weeds, you can use some dried straw to raise fish.

Raising fish is easier said than done.

In the past, Li's father contracted mountain ponds and fed them with feed, but because he was too busy, he spent three days fishing and two days sifting, and the fish were so hungry that they were big in head and small in body.

Now I have left the fish and shrimp farming in the pond to my grandpa and grandpa, but they have grown very fat.

The secret to their breeding is simple, that is diligence.

Every morning and evening, throw two handfuls of grass into the water at a fixed time.

Due to the typhoon weather a few days ago, these fish were not fed and they were starved for five or six days.

Grandpa and grandpa pushed a cart of straw to the reservoir at the foot of the mountain to feed the fish.

After feeding the fish in the pond at the foot of the mountain, they dragged the remaining straw to the pond on the other side of the cave.

When they came out of the cave, they heard the roar of an excavator from the other side of the pond.

"Old Li, are there any projects over there at the pond? How come the excavators are driven up there?" Grandpa looked at Li Yu's grandfather with some sweat on his forehead and asked.

Grandpa Li Yushi shook his head, saying that he didn't know much either.

"Why don't you go up and take a look?" Grandpa said.

Grandpa Liu Zhengyi nodded and said: "Okay, go up and take a look."

The two old men have always been in good health. Although it is the end of the world now, they have been staying at the base and have not experienced any hardships.

On weekdays, they take the children with them and feed the fish. Occasionally, when the weather is nice, the two old men will bring chessboards and fishing gear.

While fishing, I played chess by the river.

They are very content with this kind of life in their old age.

So they put the cart at the entrance of the cave and walked up the mountain.

The closer you get to the pond, the more you can hear the noise coming from the other side of the pond.

The roar of the excavator resounded.

When they walked to the shore, they saw that the water in the mountain pond had been drained, and Lai Dongsheng and others were controlling the excavator to dig there.

On the other side, Li Gang, Song Min and others took the soil dug out by the excavator and asked some people to load it away in trucks.

"What is this?" Grandpa's mind was full of doubts, and he didn't know what he was doing for a while.

"Xiao Gang." Grandpa shouted towards Li Gang.

Li Gang approached the excavator and his voice was so loud that his shouting was not heard for a while.

So Li Yushi shouted again.

Song Min, who was next to Li Gang, heard it, so she shouted to Li Gang: "Your grandpa called you."

When Li Gang heard this, he looked up and saw the two grandfathers on the shore.

So he put down what he was holding and walked straight towards the two of them.

"Grandpa, grandpa, why are you here?" Li Gang wiped his hands on his body and then wiped the sweat with his sleeves and asked.

"Come and see, what are you doing? Do you want to expand the pond?" Grandpa asked.

Li Gang turned around and looked at the construction site and said: "Didn't there be a typhoon a few days ago? Yesterday, my dad and I found zombies in the pond. Then we emptied the water. My eldest brother said we should just drain the pond.

Let’s repair it here, seal the underground and walls of the mountain pond with cement, and build it like a reservoir.”

When grandpa heard this, he frowned and said, "Seal them all?"

"Yes, it's sealed with concrete. Isn't that a good thing?" Li Gang saw that his grandfather seemed a little unhappy, so he explained.

Liu Zhengyi, who was standing next to him, shook his head and said: "Reservoirs are not built this way. Ordinary reservoirs do not have bottom seals. Reservoirs are usually sealed with concrete around them. If the bottom of the ditch is sealed, there will be no underground water in the mountains.

If the method becomes popular, it will become a stagnant water."

Grandpa also nodded and said: "I have never read a book, but I also participated in the construction of Meishan Reservoir. The bottom of the ditch was not sealed at that time."

Both old men said this, which made Li Gang a little confused.

So I told Li Yu about this situation.

Li Yu didn't quite understand this, so he asked Ding Jiu and his father, people who often worked on construction projects.

Finally I realized something.

The main function of a reservoir is to store water, so some will build a waterproof layer at the bottom and then cover it with a layer of concrete.

But there are also some reservoirs where fish are raised, so the bottom is not covered with concrete.

For most fish ponds, the silt and feces in the water are conducive to the growth of fish. Although the cement bottom is clean and not easy to seep water, its pollutants are not easy to decompose. It is more suitable to use a soil bottom for natural isolation.

This is actually an option. Using cement to seal the bottom will make the water source less likely to seep, but it is not suitable for farming.

However, if the bottom is not sealed with cement, it cannot solve the problem that Li Yu used cement to seal the bottom, in order to prevent zombies from sinking to the bottom in the mud.

Just when Li Yu was a little confused, Ding Jiu proposed a solution.

There is no need to seal the bottom of the reservoir with cement, but instead use gravel to lay a layer underneath.

"Mr. Li, there are actually many benefits to using stones as a foundation.

In the past, when I helped some resorts build lakes, I always used this method.

First, it can help adjust the pH value of the water body and keep the water quality neutral.

At the same time, the stone also has an adsorption function, which can absorb some impurities and keep the water clear. In addition, the stone contains minerals, which can improve the immunity of fish.

In addition, paving stones at the bottom of outdoor fish ponds can also promote the metabolism of animal cells and clean up the dirt in the cells, which has certain health care effects.

There are also disadvantages, that is, it is more troublesome, consumes more stones, and the cost is relatively high.

But it doesn’t seem to be a problem now. There is a quarry not far from our base. There are a lot of stones there. You can just drive here and transport them.”

Li Yu naturally knows that quarry.

The quarry was less than two kilometers away from his original house near the national highway.

Before the end of the world, the sound of cannons would be heard every evening.

There was also a lime factory in that place. Years ago, there would always be people carrying this lime to sell on the polder.

In that era when building new houses was popular, the demand for lime was very high.

Li Yu thought about it carefully and felt that the idea proposed by Ding Jiu was indeed the best solution.

So he told Li Gang and asked Ding Jiu to go over and take a look and give some professional opinions.

After Li Gang heard the solution of using stones as a base, he felt good about it.

So I told my grandfather and grandpa about this result.

Li Yushi looked at the expanded mountain pond and said with some regret: "This is a big project. In the past, it would have been expensive to build it with so many people and stones, but it is not a problem now."

Then he went down the mountain with Li Yu's grandfather.

But when we were going down the mountain, due to the typhoon that happened a while ago, there were still wood and gravel in the forest, the road was uneven, there was some water on it, and the road was a little slippery.

Grandpa went down the mountain in a hurry. His foot slipped and he accidentally fell.

"Ouch!" Liu Zhengyi slipped and fell to the ground and hit his head on a stone.

Since he was going down the mountain and his body was facing down, he couldn't get up.

"What's wrong?"
To be continued...