Chapter 81

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

And this is not over, the growth and development of potatoes need more than ten kinds of nutrients, the demand for fertilizer is quite large.

If potatoes are continuously planted in a plot, the soil fertility will be greatly reduced due to the absorption of soil fertility by potatoes. In the second year of continuous cropping, the yield will be reduced, and the tuber quality will also be reduced, especially the diseases, insects and weeds will be more serious.

Even the protagonist of Mars rescue, when planting potatoes on Mars, is the vacuum dried excrement saved by the astronauts before reuse, fermentation into manure, before planting potatoes.

More importantly, the stems and leaves of potato plants are poisonous, even the potato itself is poisonous.

Solanine and Chaetomium are the main components of potatoes. Generally, when heated to 170 ℃, the toxin will decompose.

Although the toxicity of cultivated potatoes is not high, but the consumption of more than 1.4 kg, the cumulative toxicity in the body will still produce toxic reactions.

As for the solanine produced after potato germination, it is a kind of toxin that will be seriously poisoned if 0.2-0.4g is ingested.

Especially for pregnant women, if long-term consumption of potatoes, which contains alkaloids accumulated in the body is likely to lead to fetal malformation.

Before the disaster, of course, you can eat and grow potatoes at will. After all, there are a lot of potatoes, and you can avoid many problems in planting as long as you pay attention to rotation and fertilization.

However, the toxin in potatoes is an unavoidable problem. After all, unlike before the disaster, people can choose a variety of food and eat many different kinds of food. The abundant supply of materials can also make people always eat fresh potatoes, greatly reducing the risk of poisoning.

But in the end, there was no such condition. The underground land resources were limited. Basically, there would only be one kind of staple food.

And that will lead to long-term consumption of potatoes.

In addition, the shelter certainly can not be planted and eaten now, and the mildew and germination of harvested potatoes during storage can be predicted.

Before the disaster, it must be throwing away. No one will eat the sprouted potatoes.

But in the last days, this is an important food reserve. Mice, cockroaches and earthworms are used to eat. How many bad potatoes? As long as you can't eat dead people, you can eat them cooked!

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

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

Because of these factors, Chen Xin chose upland rice as the main food source of his refuge.

After seeing off Qin LAN and Ding Ning, Chen Xin tidies up the place and sits at the desk.

While taking out the pistol from Qin LAN and pressing the bullet into the magazine on the workbench, he is also thinking about making an oxygen generator for Mo Qingyan.

Although he chose a very simple and crude way to make his own oxygen generator, and later relied on the system upgrade to get the oxygen generator, this method is still too extensive.

What's more, the simple oxygen generator he made before is not worth mentioning in terms of efficiency, and the utilization efficiency of light energy is still very low.

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

Chen Xin chose the second plan to upgrade. The original square plastic box was changed into a straight tube. The fill light was directly installed in the hollow part of the tube to irradiate from the inside to achieve the maximum efficiency of light utilization.

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

The settled algae bodies will be filtered during the water cycle to recover biomass, which will be used to generate methane for fuel cell power generation.

After upgrading, the whole system has become a green cylinder with a height of two meters. The light comes out faintly, and the whole cylinder is full of algae.

The oxygen produced by such a device can maintain the survival needs of a normal person, while the electric energy produced by such a device can maintain the energy consumption of the whole equipment except for the light supplement lamp, with a slight balance.

After all, under normal circumstances, the algae oxygen generation technology relies on the sunlight to promote the photosynthesis of algae. Now there is no sunlight, so the energy consumption of the fill lamp must be supplemented by other energy.

Mo Qingyan's refuge has all the power and water supply in the city. Although the supply is limited, it is not a problem to maintain the operation of the equipment.

The bullets were pressed into two magazines, and Chen Xin put one of them back into the pistol.Holding the gun for a while, he could not help taking out the pistol he made and comparing the two guns on the workbench.

Compared with the pistol made by Chen Xin himself, the caliber of the pistol Qin LAN gave him is obviously larger, but the weight is lighter. This is because Yan Guo used engineering plastic as the handle when manufacturing qsz92g semi-automatic pistol, which reduced 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. That requires his professional knowledge and experience in using guns.

After a little consideration, Chen Xin decided to use the pistol he got from Qin LAN as his usual self-defense weapon, while the pistol he made himself was put in the bedside table of his bedroom as a spare.

This is also a kind of security strategy. It's a good way to improve your ability to deal with danger to prepare weapons and equipment in the nearest place.

Although in Chen Xin's view, as long as the gate is closed and there is no heavy firepower in his refuge, it is very difficult for him to cause any security problems that he needs to deal with with with a gun.

However, it is very important to have a gun in hand in case of any problems.

After that, Chen Xin took his bow out of the weapon cabinet.

Archery was just a hobby cultivated by Mo Qingyan before, and it had no practical use.

At the end of the day, with the gun, the role of bow and arrow is greatly reduced. In a sense, the existence of this bow has become a chicken rib.

What's more, with the decrease of external temperature, the maintenance of the bow and arrow itself will become a problem if it is taken out for use.

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

Maybe you can't stab with a crossbow, but it doesn't mean you can't use a crossbow as a mechanism.

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