There weren't a lot of materials on the list that Qin Lan brought, but these materials all needed Chen Xin to exchange for the vegetables produced by his shelter, and the list also listed the exchange ratio that the SWAT team thought was appropriate after discussion.

Of course, Chen Xin has no objection to the exchange of materials, which is also very beneficial to him, but he has different opinions on the proportion of material exchange.

"A hundred pounds of fresh vegetables in exchange for five bags of cement? This ratio is acceptable. Chen Xin looked at the exchange ratio marked on the list, and checked them one by one: "But the steel bar is a bit exaggerated, right?" Twenty pounds of vegetables can be exchanged for a steel bar? ”

Steel bars are extremely useful for Chen Xin, not to mention that reinforced concrete is necessary to reinforce the doors of the shelter.

"What we provide is standard φ12X12 steel bar, and Ah Xin, you also know that there are no steel factories in this city, all of which rely on railway input, and the price is a little more understandable." Qin Lan explained to Chen Xin.

Although the two used to be boyfriend and girlfriend, when bargaining, both of them obviously did not care about their past feelings, and they were both bargaining.

"But twenty catties of vegetables can be exchanged for a steel bar, this price is still outrageous, I think ten catties is an acceptable price." Chen Xin cut the proportion of the exchange in half as soon as he opened his mouth, but his eyes looked at Qin Lan, waiting for her to make a counteroffer.

Sure enough, Qin Lan shook his head and directly refused: "Ten catties is too little, at most eighteen catties." ”

However, Chen Xin didn't give an inch, and still repeated: "Ten catties, otherwise I will go to someone else to change it." ”

"This is impossible, even if you put it before the disaster, you can't exchange ten catties of cabbage for a steel bar." Qin Lan shook her head vigorously, but still made a compromise: "Fifteen catties, no less." ”

Hearing Qin Lan say this, Chen Xin laughed and said to her: "One person take a step back, twelve catties, get me fifty steel bars first, I need it urgently." ”

"Urgently? Ah Xin, what are you going to do? Need so much rebar? As soon as Qin Lan heard Chen Xin say that he was in urgent need, he immediately became curious.

Chen Xin said directly: "The end of the world has been coming for three months, and the temperature is almost freezing. Therefore, in addition to the steel bar, cement, sand and steel plates are also needed, and I can accept the exchange ratio of these building materials, so let's ship them together as soon as possible. ”

Hearing Chen Xin say that it was to be used to strengthen the gate of the refuge, Qin Lan nodded knowingly, and agreed very happily.

Now the official shelters are also undergoing large-scale expansion work, and all the shelters have been allocated a large amount of building materials, and Chen Xin's amount of materials is not large, and the SWAT team only needs to take out a little bit of their own supplies to meet his needs.

After negotiating the demand for building materials, Chen Xin put forward a demand that was not on the list: "Ah Lan, can you help me get some glass?" It's better to have a big glass tube like a cylinder, and even better if you have an aquarium of this shape, plus a vacuum pump. ”

"You can get it, but why do you want these things?" Qin Lan asked a little strangely.

Chen Xin smiled and explained: "The aquarium can be transformed into a suggested algae oxygen generator, living in an underground shelter will definitely have oxygen problems, I need one myself, Long Niang also needs it, I can help her make one can also exchange her good wine there, and drinking can be warm when it's cold." ”

"You're not Maozi, what are you doing to drink to keep warm!" Although Qin Lan complained like this, she still agreed to Chen Xin's request and wrote down what Chen Xin wanted in the small notebook she carried.

The two checked the exchange ratio of various materials on the list again, as well as the several items added by Chen Xin, and then ended the bargaining between the two.

And after the bargaining, the topic between the three of them was much easier, and Chen Xin also asked about some topics that he was interested in.

"Speaking of which, what's the main food in the Vault right now? It can't really be rat earthworm mushroom soup, right? Chen Xin made a joke.

But rats, earthworms and mushrooms are indeed animals and plants suitable for raising in low temperatures and dark underground environments, and they are also the main food sources for the refuge announced by the state before the disaster.

Regarding this question, Ding Ning just shrugged his shoulders and leaned on the sofa in Chen Xin's living room: "I only recently avoided the shelter, I don't know very well, but what I eat is basically rat meat stewed with potatoes and mushrooms, but it's strange that the rice can still be full." ”

"The state mobilized a lot of rice before the disaster, and now it's not surprising that there is rice to eat." Qin Lan knew a little more about the situation than Ding Ning, so she explained to Chen Xin: "As for mushrooms and potatoes, mushrooms are currently growing in every shelter, and the mushroom package provided by the state has a good yield, and now it can be harvested once a month, if it is not for the insufficient planting area, in fact, mushrooms alone can already meet the needs of food." ”

Speaking of this, Qin Lan paused for a moment before continuing: "As for potatoes, the country has not promoted the cultivation of potatoes on a large scale, although this thing has a high yield, but the demand for soil and fertilizer is also high, and the yield is not as stable as that of mushrooms.

In addition, it consumes water and electricity, and the general shelter does not have the conditions for large-scale planting, so the city has opened up a special underground planting area near the power plant to grow potatoes, and the yield is not too high. ”

When Chen Xin heard Qin Lan say this, he also nodded in understanding.

In fact, when he built the shelter, his first thought was to grow potatoes.

Thanks to the blessing of the "Martian" back then, everyone knows that planting potatoes can survive, so they feel that the end of the world is over, shouldn't potatoes be planted at this time?

Especially in various time-traveling novels, in addition to burning glass to make soap, finding potatoes has almost become a must-do in ancient times.

It seems that everyone thinks that this is a kind of artifact, and the yield of several thousand catties of crops per mu is undoubtedly a dimensionality reduction blow for the yield per mu of traditional agriculture, which may not be one-tenth of the yield of potatoes.

Potatoes do have many advantages, first of all, the yield is naturally high, and the yield of several thousand catties per mu seems to be a very common yield for potatoes.

Secondly, potatoes are very suitable for growing in alpine regions, Mongolia in the Yan country, Siberia in Lucia, are the main producing areas for growing potatoes, it can grow healthily in the environment where the temperature is only 10 degrees or less, and it does not require too much water irrigation to ensure a high yield.

Moreover, potatoes are also nutritious, rich in starch, and can provide a lot of calories and nutrients for the human body in a cold environment, which is indeed an important food to maintain life.

But potatoes aren't perfect.