Doomsday Bunker Upgrade

First of all, potato planting has very strict requirements on soil. Only soil with deep soil layer, loose structure, good drainage and ventilation and rich in organic matter is the most suitable environment for potato growth.

And this is not the end, the growth and development of potatoes requires more than ten kinds of nutrients, and the demand for fertilizers is quite large.

If a piece of land is continuously planted with potatoes, the absorption of soil fertility by potatoes will greatly reduce soil fertility. The continuous cropping plot will reduce the yield in the second year, and the quality of tubers will also decline, especially diseases, insects, and weeds will occur. more serious.

Even the protagonist of "The Martian", when planting potatoes on Mars, reused the vacuum-dried excrement that the astronauts had saved before, and fermented it into manure before planting potatoes.

More critically, the stems and leaves of the potato plant are poisonous, and even the potatoes themselves are poisonous.

Potatoes mainly contain solanine and chitosan, and the toxins are generally decomposed when heated to 170°C.

Although artificially cultivated potatoes are not highly toxic, if the consumption exceeds 1.4 kg, the accumulation of toxicity in the body will still produce a toxic reaction.

As for the solanine produced by potatoes after germination, it is a toxin that can be seriously poisoned if ingested 0.2-0.4g.

Especially for pregnant women, if they eat potatoes for a long time, the alkaloids contained in them may accumulate in the body and cause fetal malformations.

Before the disaster, of course, everyone can eat and plant potatoes as they please. After all, potatoes are indeed in large quantities, and as long as you pay attention to rotation and fertilization when planting, many problems in planting can be avoided.

But the toxin in potatoes is an unavoidable problem. After all, the last days are not like before the disaster. People can choose from a wide variety of foods, and they can eat many different foods, and the abundant supply of materials can also allow people to always eat fresh. Potatoes, greatly reduce the risk of poisoning.

But there are no such conditions in the apocalypse. The underground land resources are limited, and there will basically be only one type of staple food to grow.

And this will cause people to eat potatoes for a long time.

Coupled with the fact that the shelter cannot be eaten immediately, mildew and germination of the harvested potatoes during storage are predictable.

This must be thrown away before the disaster, no one will eat the sprouted potatoes.

But in the apocalypse, these are all important food reserves. Mice, cockroaches and earthworms will eat them. How many broken potatoes? As long as it doesn't kill people, it can be eaten cooked!

So at this time, the toxin in potatoes is a problem that cannot be ignored.

From a national level, if you need to choose a doomsday staple at this time, potatoes will obviously not be the best choice, especially when planting potatoes requires a lot of light.

It was because of these factors that Chen Xin chose upland rice as the main food source for his shelter.

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After sending Qin Lan and Ding Ning away, Chen Xin cleaned up the place and sat in front of the workbench.

While taking out the pistol exchanged from Qin Lan just now and putting it on the workbench, pressing the bullets into the magazine, he was also thinking about making an oxygen generator for Mo Qingyan.

Although he chose a very simple and rude production method when he made the oxygen generator for himself, and later relied on the system upgrade to obtain the oxygen generator, this method was still too extensive.

Moreover, the overly simple oxygen generator he made before was really nothing worth mentioning in terms of efficiency, and the utilization efficiency of light energy was still very low.

However, after the system upgrade, even Chen Xin's simple and crude oxygen concentrator is now decent.

Chen Xin chose to upgrade the second plan. The original square plastic box became a straight hollow round tube. The fill light was directly installed in the hollow part of the round tube, and irradiated directly from the inside to achieve maximum efficiency. of light energy utilization.

The algae are directly raised in the circular tube for reproduction, and the oxygen produced will be discharged from the top, while the bottom has pores to inject carbon dioxide.

The settled algae bodies are filtered during the water cycle to recover biomass, which is used to generate methane for fuel cells to generate electricity.

After the upgrade, the entire system has become a green column with a height of two meters. The light is faintly seen from the inside, and the entire column is full of algae.

The oxygen produced by such a device can maintain the needs of a normal person's survival, and the electricity generated can maintain the energy consumption of the entire set of equipment except for the fill light, and there is a slight surplus.

After all, under normal circumstances, the algae oxygen generation technology relies on sunlight to promote algae to perform photosynthesis. Now that there is no sunlight, this part of the energy consumption of the fill light must be supplemented by other energy sources.

Mo Qingyan's shelter has electricity and water supply in the urban area. Although the supply is limited for a limited time, it is not a problem to maintain the operation of the equipment.

After pressing the bullets into the two magazines, Chen Xin inserted one of the magazines back into the pistol.

Holding the gun and feeling it, he couldn't help but take out the pistol he made and put both guns on the workbench for comparison.

Compared with the pistol made by Chen Xin himself, the pistol Qin Lan gave him is obviously larger in caliber, but lighter in weight. This is because Yan Guo used engineering plastic as the handle when making the QSZ92G semi-automatic pistol, which reduces the weight of the pistol. a lot of weight.

As for other performance differences, Chen Xin can't compare the quality of the two guns without actually taking out dozens of bullets, which requires professional knowledge and experience in using firearms.

After some consideration, Chen Xin decided to use the pistol he obtained from Qin Lan as a weapon for his usual self-defense, while the pistol he made himself was placed on the bedside table in the bedroom as a backup.

It's also a security strategy, and having weapons and equipment at the nearest location is a great way to improve your ability to deal with danger.

Although in Chen Xin's opinion, as long as the door is closed in his shelter and there is no heavy firepower, it is difficult to cause him any security problems that need to be dealt with with guns.

But be prepared, in case of any problems, it is still very important to have a gun on hand.

After doing this, Chen Xin took out his bow from the weapon cabinet.

Archery was just a hobby cultivated by Mo Qingyan in the past, and had no practical use.

At the end of the day, the role of bows and arrows is greatly reduced after the guns are in place. In a sense, the existence of this bow has become tasteless.

What's more, as the outside temperature drops, if you take it out for use, the maintenance of the bow and arrow itself will also be a problem.

So Chen Xin plans to see if the bow can be used for other purposes after the upgrade. If possible, he plans to upgrade the bow to a crossbow, and then install it at the upgraded gate to use it as a defense facility.

Maybe you can't use a crossbow to backstab, but it didn't say you can't use a crossbow as a mechanism.

I just wonder how many people don't know that potatoes are poisonous