Now that it has been decided to exchange vegetables for materials, the planting greenhouse is obviously the place where Chen Xin needs to upgrade the most.

At present, half of the land in Chen Xin's planting greenhouse is planted with carrots, and it will take about two months to harvest, while the other half of the land has been planted with lettuce and cabbage, and now that it has just been harvested, Chen Xin needs to refertilize the land and then turn the soil to replant new seeds.

The refertilization of the land is accompanied by ploughing, commonly known as ploughing or ploughing.

This is done by breaking up the clumped parts of the soil to make the soil loose and easier for the crops to grow, and at the same time, the fertilizer can also be turned deep into the soil layer so that the crops can better absorb the nutrients in the fertilizer.

Ploughing is one of the most important parts of the entire farming process, and it is also the most tiring of all farm work, which is why in ancient times there were ploughing oxen and even war horses to plough the land.

Because it is too tiring to plough a piece of land by manpower, the use of animal power can greatly save manpower, and at the same time, it can also improve the efficiency of arable land and save time.

After all, cattle ploughing land and human ploughing land are two completely different concepts.

However, Chen Xin's planting greenhouse is too small, and he has no cattle to use, so he can only take a hoe to turn the ground little by little.

Fortunately, the area of land that Chen Xin wants to turn over is not large, and the temperature of the planting greenhouse is constant, so he doesn't have to rush to do anything, as long as he finishes turning and planting the seeds.

However, even so, it took Chen Xin more than half a day to finish plowing the 50 square meters of land and re-sowing the seeds.

Looking at the land he had cultivated, Chen Xin hammered his waist, feeling that doing farm work is really a tiring job, and at the same time thinking about whether he should upgrade the farm tools in his hand when upgrading the planting greenhouse, so as to improve the efficiency of cultivated land.

With the upgrading of the planting greenhouse, the planting area will definitely increase, and the increase in the planting area will inevitably be followed by the increase in workload.

Although there is nothing else to do in the shelter, and it is not bad to do farm work, but this kind of manual labor is really enough for Chen Xin, who has never done farm work in the first 30 years of his life, and it does not matter if the area is small to cultivate by manpower, when the planting area increases, the use of mechanical power is the right way to improve efficiency.

Maybe I can ask Mo Qingyan for a few small agricultural machinery? Although the precious survival point can be used to upgrade farm tools, Chen Xin feels that it should not be wasted, after all, small agricultural machinery is not a difficult thing to start even in this era of the end times.

In addition to small agricultural machinery, Chen Xin also plans to get a few more fill lights, which are essential tools in the planting greenhouse, and also the materials needed to upgrade the planting greenhouse.

As for the other materials for the upgrading of the planting greenhouse, it is only steel and cement, which are basically the building materials that will inevitably be used to expand the planting greenhouse.

Of course, if Chen Xin adds various equipment required for hydroponic planting to the materials used for upgrading, then when upgrading the planting greenhouse, Chen Xin can not only expand the land area of the planting greenhouse, but also add an additional layer of hydroponic planting trays, so that the planting area of the planting greenhouse can be doubled.

This is also the difference between using material upgrades and using survival point upgrades, using survival point upgrades, you can only choose one of the two upgrade plans given by the system, and there is no way to choose all of them in one upgrade.

But if you use materials to upgrade, there is no such trouble, as long as you can meet all the materials required for the upgrade, you don't need to consider the problem of choosing one of the two at all, you can upgrade both options at once.

As for the difference in functions brought about by the two upgrade methods, Chen Xin understands that this may be a function set by the higher civilization in order to increase the fun of the survival game when creating this system.

After all, for high-civilization individuals who can play survival games, they want to have a better gaming experience.

If you just stay somewhere and then play Doomsday Survival by stacking survival points to upgrade items, it obviously feels a bit negative, and the game experience is also poor, after all, there is no actual sense of participation.

Maybe you will spend some time building a hiding place or a survival hut for yourself in the early stage, but with the storage of survival points, you can completely give up going out to collect resources and work on your own to improve your living conditions.

But collecting upgrade materials by yourself is different, after all, the resources you have worked hard to collect are used to level up, and watching the accommodation you build with your own hands get better and better, which will obviously greatly satisfy the sense of accomplishment and participation of those players.

Moreover, the upgrade of collecting resources can also save survival points, which is equivalent to the system changing direction to encourage the use of resources to upgrade.

After all, resource upgrades need to save survival points, and when collecting materials, you can save enough survival points, which invisibly increases the survival chances of players who upgrade with resources.

In particular, resources can be stored in advance, as long as there are enough resources and survival points, they can be upgraded.

As for those players who directly use survival points to level up, on the one hand, the function of the items they upgrade is weaker, and on the other hand, if they only use survival points, their upgrade progress will undoubtedly be much slower than that of players who use resources to upgrade.

However, these may be just games for advanced civilizations, but for Chen Xin, these are treasures that can save his life and greatly increase his probability of survival in the apocalypse.

Thinking of this, Chen Xin also hurriedly made a list and confirmed what he needed.

"One hundred kilograms of steel, five bags of cement, a set of hydroponic planting tools, and a ...... of fill lights" Chen Xin counted the resources he needed one by one, and couldn't help but shake his head: "This is a bit much, if you want to exchange these things, I'm afraid I'm going to bleed heavily." ”

Because half of the area of Chen Xin's planting greenhouse is planted with carrots that can only mature and harvested in three months, and the other half of the vegetable production is extremely limited, before upgrading the planting greenhouse, Chen Xin feels that he may have to supply all his monthly output if he wants to rely on the current vegetable output to get what he needs.

But this is not too urgent, he can ask Mo Qingyan to help collect materials through Uncle Ding's relationship first, first use the vegetables produced this month as a deposit, and wait for the carrots to be harvested next month, and then settle the final payment.

With these materials, Chen Xin can upgrade the planting greenhouse, increasing the planting area of the greenhouse by four times the current level.

Moreover, Chen Xin upgraded the system, which does not have the construction period required for normal construction, which can save more time.