Doomsday Bunker Upgrade

　　 First of all, potato planting has very strict soil requirements. Only the 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 require more than ten kinds of nutrients, and the demand for fertilizer is quite large.

If a piece of land continues to grow potatoes, the soil fertility will be greatly reduced due to the absorption of soil fertility by potatoes. The continuous cropping plot will reduce the yield in the second year, and the tuber quality will also decline, especially diseases, insects, and weeds will occur. Got more serious.

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

　　 More importantly, the stems and leaves of potato plants are poisonous, and even potatoes themselves are poisonous.

　　 Potatoes mainly contain solanine and chaetomycin. Generally, the toxin will be decomposed when heated to 170°C.

　　Although artificially cultivated potatoes are not highly toxic, if they are eaten more than 1.4 kg, the toxicity will still cause poisoning reactions when they accumulate in the body.

　　 As for the solanine produced after the potato germinates, it is a toxin that can be severely poisoned after ingestion of 0.2 to 0.4 g.

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

　　Before the disaster, of course, everyone can eat and grow potatoes at will. After all, potatoes are really large and full, and as long as you pay attention to rotation and fertilization when planting, you can avoid many problems in planting.

But the toxins in potatoes are an unavoidable problem. After all, unlike before the disaster, the last days are rich in types of food that people can choose, and they can eat a lot of different foods, and the abundant supply of materials also allows people to always eat fresh. Potatoes greatly reduce the risk of poisoning.

　　 But in the last days, there is no such condition. The underground land resources are limited, so there will basically only be one kind of staple food.

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

　　 In addition, the refuge must not be able to be grown and eaten now. It is foreseeable that the harvested potatoes will mold and germinate during storage.

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

　　 But in the last days, these are all important food reserves. Rats, cockroaches, and earthworms are all used to eat. How many broken potatoes? As long as it is undead, you can eat it cooked

　　 So at this time, the toxins in potatoes are a problem that cannot be ignored.

　　Considering from the national level, if you need to choose a staple food of the end at this time, potatoes are obviously not the best choice, especially when a lot of sunlight is needed to grow potatoes.

　　 Chen Xin also chose dry rice as his main food source for refuge because of these factors.

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

　　 While taking out the pistol that I had just exchanged from Qin Lan, put it on the workbench and pressed the bullet into the magazine, while also thinking about making an oxygen generator for Mo Qingyan.

　　 Although he chose a very simple and rude way of making the oxygen concentrator for himself, and later relied on system upgrades to obtain the oxygen concentrator, this approach was still too extensive.

　　 And the too simple oxygen generator he made before is really not worth mentioning in terms of efficiency, and the efficiency of light energy utilization is still very low.

　　 But after upgrading with the system, even Chen Xin's simple and crude oxygen generator now looks decent.

Chen Xin chose the second plan to upgrade. The original square plastic box was turned into 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. The utilization of light energy.

　　Algae are directly raised in round tubes for reproduction, the oxygen generated will be discharged from the top, and the bottom has pores to inject carbon dioxide.

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

　　 After the upgrade, the whole system has become a green cylinder two meters high. The light faintly shines through the cylinder, and the entire cylinder is full of algae.

　　 The oxygen produced by such a device can sustain a normal person's survival. As for the electricity generated, it can maintain the energy consumption of the entire device except for the supplementary light, with a slight surplus.

　　 After all, the algae oxygen generation technology under normal conditions relies on sunlight to promote the photosynthesis of algae. 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 refuge has the electricity and water supply in the urban area. Although it is provided for a limited time, it is not a problem to maintain the operation of the equipment.

　　 pressed the bullets into two magazines, and Chen Xin inserted one of the magazines back into the pistol.

　　 held this gun and felt it, he inevitably took out the pistol he made, and put the two guns on the workbench for comparison.

Compared with the pistol made by Chen Xin~www.NovelMTL.com~ The pistol given to him by Qin Lan is obviously larger in caliber, but lighter in weight. This is because Yan Guo used engineering when manufacturing QSZ92G semi-automatic pistol. Plastic as the handle of the gun reduces a lot of weight.

　　 As for other performance differences, Chen Xin cannot compare the quality of the two guns without actually taking out dozens of bullets. That requires his professional knowledge and firearms experience.

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

　　 This is also a safety strategy. Preparing weapons and equipment in the nearest place is a good way to improve your ability to deal with danger.

　　 Although in Chen Xin's opinion, as long as the door is closed in his refuge and there is no heavy firepower, it is difficult for him to cause security problems that he needs to use guns to deal with.

　　 But be prepared, if you encounter any problems, it is important to have a gun in your hand.

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

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

　　 In the doomsday, the role of the bow and arrow is greatly reduced after having the gun. In a sense, the existence of this bow has become tasteless.

　　 What's more, as the outside temperature drops, the maintenance of the bow and arrow itself becomes a problem if it is used outside.

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

　　 Maybe you can't use a bed crossbow to back stab, but I didn't say you can't use a bed crossbow as a mechanism.