While Li Yu was building a house, he did not forget to solve the problem of eating.

The food that the lizardmen brought out of the swamp consisted mainly of dried meat and wild vegetables, plus the stock of food and some poultry they had looted after sacking several villages.

These foods can probably last them for a month, or even a little longer, but Li Yu still paid for another batch of food from Black Rock City, mainly wheat and rye, plus beans, peas and onions, which are also the most common foods on the tables of ordinary people in the Red Lion Empire.

In addition, there was a lot of farmland on these two lands, and it was almost time to harvest.

Although some of them have been ravaged by the lizardmen, some of them can still be saved, and in addition to the carrots, which are the specialties of the green fields, barley and wheat, are also almost ripe.

Of course, Li Yu didn't want to waste it.

Some time ago, he and Yin Leiya made a lot of money selling pepper together, but now in just a few days, most of this money has been spent by him.

And that's just a fraction of the upfront investment.

After Li Yu followed Miss Rabbit to her territory, although she seemed a little unprofessional, she took the little maid Clara and a few children who had not grown up to wander around in the green field every day.

But it was also this valuable experience of field research that gave him a deeper understanding of the land.

Among them, agriculture is especially the focus of Li Yu's inspection.

Food production is the most important thing at all times and in all places.

If you've ever played a Don't Starve game, you know that in the early stages of the game, most of your time will be spent collecting food to feed yourself on something that sounds simple.

In fact, overproduction is one of the basic conditions for the creation of civilization.

If you can make more food from the land, then you can free more people from the land for other jobs.

The level of agriculture on the continent of Brattis is so backward that the ratio of crops to crops reaches 1:4 against the sky, which is actually the result of a combination of conditions.

Geography and climate are left to the point where the species of the starting crops themselves differ (for example, rice in Asia is naturally more productive than wheat in Europe), which is difficult to change for the time being.

First of all, there is a big problem with the tools.

Li Yu had seen the ploughs used by the farmers in the green fields, which were still similar to the scraping plows used by the ancient Romans.

The plough is wooden, with blades and birch on its head, and can be dragged by humans and animals, but it can only plow the topsoil, and cannot really turn the soil, loosen the soil, and cannot remove the root system of the weeds located in the lower layers.

When the seeds are sown, the weeds will start competing with the seeds for nutrients in the land.

Moreover, even the number of such ploughs is pitiful, and often there are only one or two in a village, which are owned by the lord, which is far from satisfying the cultivation needs of the people of a village.

Li Yu was right and planned to introduce the ploughshare, which appeared very early in China, but was introduced to Europe thousands of years later, and is still widely used all over the world, although many have been hung behind tractors.

Its structure is not complicated, including a ploughshare, a soil divider, a plow frame, and a small wheel that can be adjusted in height.

Among them, the rubber wheels can be replaced by wooden wheels, and the ploughshares and soil chips are best made of iron, if not, they can even be made of wood, after all, many ploughshares in the Spring and Autumn Period and the Warring States Period were pure wood, which is nothing more than a worse effect.

If you replace the ploughshare with a chisel, you can also aerate the hard soil layer that has been cultivated too hard.

In addition, the seeder Li Yu is also ready to come to one, the principle of this thing is also very simple, it is a wheelbarrow that can be pushed by hand, plus a wooden baffle and funnel that can be rotated, as long as the seeds are added from above, they can be evenly sprinkled on the land, and the efficiency can be improved a lot compared to sowing seeds by hand.

There is also the scythe, the short-handled scythe used on the continent of Brattis can only cut half of the straw, but if the handle can be lengthened, more straw can be chopped, and the straw can be used as fodder to feed livestock............

Li Yu can easily find the right model on Taobao with all these tools.

Take it as a prototype, and then recruit the blacksmith to cooperate with the carpenter in the territory, as long as you try a few more times, you should be able to achieve mass production, and if Li Yu finds other useful farm tools on Taobao that can be reproduced with the technical means of Brattis today, he will also move them together.

In addition to the backwardness of production tools, the lack of fertility is also a major factor.

Most of the continent of Brattis still uses the two-garden system, that is, the field is divided into two plots, only half of the land is planted each year, the other half of the land is rested, and then it is alternated in the next year, and the land that was cultivated before is empty, and the other land is cultivated, and so on.

The reason for this is to give the land a rest and to be able to regain its fertility.

Of course, the disadvantages are also obvious, only half of the fields are utilized, and half of them are empty every year.

Only a few areas with very fertile land will practice the three-garden system.

This is very similar to the two-garden system, except that the land is divided into three parts, each of which has one year of idle land and the remaining two years can be cultivated.

As long as a simple calculation can be seen, the efficiency of the three-garden system has been greatly improved compared with the two-garden system, and the land utilization rate has increased from 50% to 66.7%, and each piece of land can almost harvest 30% more grain.

Unfortunately, not all places are fertile ground.

For example, Miss Rabbit's green field can only adopt the mode of two-field rotation and forcibly change to a three-garden system, which may be bumper in the first two years, but the harvest will become worse and worse in the future, until it is completely impossible to cultivate.

The Church of the Silver Moon claims that this is a goddess teaching the people of this land not to be too greedy.

And Li Yu knew that it was the nitrogen in the land that was depleted.

And to solve this problem is also very simple, every modern person who has completed nine years of compulsory education can easily say the answer, that is-beans.

More precisely, rhizobia parasitized in the roots of legumes, a special bacterium that can send nitrogen from the air back to the soil.

By taking advantage of this feature, it is not only possible to upgrade the land that could only implement the two-nursery system to the three-nursery system, but also to further develop the four-field rotation model.

In addition, instead of taking a break for each of the four fields, they are all planted with crops for four years, and the land utilization rate is increased to 100 percent by planting different legume crops every other year.

This was a necessity for Li Yu, as the number of lizardmen was significantly greater than the land he had been given, twice as many as the number of people living on the land before.

If you want to be self-sufficient, you have to make good use of every piece of land.