The planting greenhouse in Chen Xin's shelter is not large, only 100 square meters, that is, one acre, one-sixth of an acre.

Chen Xin actually made a mistake here, when he built the planting greenhouse, the construction team once asked him how much area he wanted to repair, and he counted the acres into acres, so that the area of the planting greenhouse was six times smaller.

In Chen Xin's original plan, this place was to be used to grow upland rice and vegetables, and to provide him with food to ensure his normal consumption and exchange for resources.

But now because of the wrong area, the output is far from enough.

The yield per mu of upland rice is about 900 catties, and the yield of rice after hulling is about 700 catties, while one mu is only equivalent to about one-sixth of the acre of land, and the yield is only more than 100 catties.

The total amount of rice that an adult eats in a year is about 300 catties, in addition to about a similar amount of vegetables and meat, in short, if Chen Xin wants to keep his body in a healthy state, then he must eat at least about 500 catties to 600 catties of food a year.

Considering that the surface temperature will drop to dozens of degrees below zero in the future, and sufficient food is the guarantee of the body's source of calories, I am afraid that the consumption of food will only be more than this, not less.

In the last days, the conditions are limited, and Chen Xin no longer expects meat, but even if it is just vegetables and rice, with Chen Xin's planting greenhouse of only 100 square meters, even if he can grow two seasons of upland rice a year, all the harvest will last for 300 catties of rice a year, and there is no place to grow vegetables.

Three hundred catties of rice can't meet Chen Xin's food needs for a year anyway.

In Chen Xin's original plan, he planned to plant half an acre of upland rice to ensure that he could eat himself, and the other half acre of land to plant some vegetables such as carrots, cabbage and lettuce.

After all, the end of the world has come, there is no sunlight on the surface, and the temperature has dropped to dozens of degrees below zero, and the cultivation of crops and vegetables has already relied on these planting greenhouses.

There is a planting greenhouse to grow some food and vegetables, which is a guarantee for his quality of life and food supply, at least Chen Xin can rely on this planting greenhouse to survive when he has no other food sources.

Moreover, in the last days, if Chen Xin can have a stable channel for producing vegetables and fruits, it will be a very reliable source of income in the near future.

At that time, exchanging fresh vegetables for other food and supplies, and even gasoline for electricity generation, is a very viable option.

It's like the dungeon in "The Wandering Earth", where the food everyone eats is earthworms or something, and you suddenly take out fresh vegetables and fruits, which can definitely be exchanged for a lot of good things.

In Chen Xin's original plan, this acre of land was planned to be planted half of upland rice and half of vegetables and fruits, so that it could not only meet his own consumption, but also save some of it to exchange for materials.

It's just that because of a miscalculation, he counted one acre as one acre of land, and the output was suddenly only one-sixth of the original, and it was not enough to meet his own consumption, so how could he have the excess output to exchange for materials?

Chen Xin has carefully calculated that if he wants to meet his food consumption for a year, then the area of the entire planting greenhouse must be at least doubled, and if he wants to have excess output to exchange for materials, it must be at least three to four times the size of the current one.

Originally, Chen Xin was unlikely to have a way to expand the planting greenhouse, although the greenhouse was not a container house, but the four walls Chen Xin also let the construction team make an insulation wall, and poured cement, if it was expanded, at least one side of the wall should be knocked out, and then he took a shovel to dig slowly.

Although there is nothing to do in the shelter, if he wants to dig a 100-square-meter greenhouse, Chen Xinshao said that he has to dig for a month or two.

As for the follow-up wall insulation or something, not to mention, he didn't even have construction materials.

But now with the system, it's all very different.

"Simple Growing Greenhouse"

"Upgrade option 1: increase drip irrigation system, increase hydroponic planting trays, crop yield +10%, irrigation water consumption -10%, upgrade required survival point 2000"

"Upgrade plan 2: increase the planting area, improve the efficiency of supplementary lighting, crop yield +10%, light time -10%, and upgrade the required survival points 3500"

Both upgrade options are different, but both increase the acreage of the greenhouse.

If the original 100-square-meter planting greenhouse is turned into two floors, the lower layer of land is planted with upland rice, and the upper layer of hydroponic planting tray is planted with vegetables, plus the 10% increase in crop yield obtained by upgrading, this is enough to meet Chen Xin's own food consumption.

As for the second plan, it is the same as Chen Xin's original plan, knocking down a wall to expand the entire planting greenhouse, and upgrading the area from 100 square meters to 200 square meters, which can also meet Chen Xin's personal consumption needs, but compared with the first plan, the space utilization rate is obviously lower.

And the first plan also adds a drip irrigation system, this irrigation method is the most water-saving way, using this way to achieve 95% water resource utilization, originally used for irrigation in arid areas, for Chen Xin, who is difficult to obtain water resources in the last days in the future, this method can undoubtedly save him a lot of water resources that would otherwise be consumed.

However, the improvement of the lighting efficiency of the second upgrade plan also made Chen Xin a little concerned.

Fill light is a kind of lamp used to simulate sunlight, and most of the greenhouse planting needs this equipment to supplement the plant light.

Because many times the light conditions are not ideal, it will affect the growth of plants, especially the planting of some precious or delicate plants, the daily light time has different requirements for different growth stages, so it is necessary to use a fill light to supplement the light time.

Chen Xin installed four fill lights in the greenhouse, which can completely replace natural light by turning on 12 hours a day, which can reduce the light time by one hour and save a lot of electricity.

Now the area is small, and this saving effect cannot be seen, but if the planting area is expanded and the fill light is increased, the energy-saving effect is obvious.

However, at present, Chen Xin is still accumulating survival points at 10 o'clock a day, and asked him to spend two or three thousand points to upgrade the greenhouse, and he obviously does not have the savings to upgrade the room.

Therefore, at present, Chen Xin can only make an upgrade plan according to the upgrade cost and importance of different rooms, as for the real upgrade of these rooms, Chen Xin feels that it will take at least a year.

Of course, if Chen Xin chooses to upgrade certain equipment or items, rather than upgrading the room as a whole, then he will save up for another month, which is almost enough to upgrade once.

Just thinking about the cost performance, Chen Xin still didn't want to upgrade by only upgrading a single item.