On the surface, a thousand people built the bamboo city, but in fact, the entire tribe is working hard to build the bamboo city, and there will be a large number of people burning bricks on the side of the source city and Chicheng, and transporting them to the bamboo city by boat, in order to speed up the construction of the bamboo city, and the bamboo city may be completed before the summer of next year, and thousands of people will be accommodated.

Now there are two castles of the Dragon Tribe and one city under construction, Zhi is the lord of Akagi, Matsu is the lord of the source city, and Yuan is the lord of the bamboo city, the position of the lord of each city will change every few years, and the old lord will be responsible for the construction of the new city if he has experience in managing the city, and the new lord will slowly become the old lord after learning the experience of managing the city.

In addition to the construction of the bamboo city, spring ploughing is also an important thing that the dragon tribe needs to be busy with next, this year will cultivate 20,000 acres of millet, 3,000 acres of hemp, 3,000 acres of soybeans, in addition to cabbage and green onions will also be planted hundreds of acres this year, the scale is a little larger than last year.

"Well, how did I forget about it." Su Yan knocked his head a few times with his hand, but this matter was related to the cow.

Oxen can be harnessed to plough the land, and the specific tools used are ploughs to break up clods of soil and plough furrows in preparation for sowing.

The people of the Dragon Tribe have been using pickaxes to plough the land, and the efficiency is not very fast, and they use oxen to pull the plough to plough the land, but Su Yan forgot that there is a light plow that can be used by manpower, and he didn't remember this until now.

"It seems that this year will not be able to catch up, and in a year's time, we will create a plough suitable for human use, and manufacture it in batches, and put it into use next spring."

On the third day of spring ploughing, Su Yan observed that there was no problem with spring ploughing, and turned to start the plan of building a manpower plow.

In the agricultural era, the earliest farmers used simple digging sticks or hoes to dig up the fields, and after the fields were dug up, they threw the seeds into the ground in the hope of a good harvest.

Early plows were made of Y-shaped wooden segments, with the lower branches carved into a pointed end and the upper two branches made into two handles.

When the plough is tied to a rope and pulled by an ox, the pointed head makes a narrow shallow furrow in the dirt that the farmer can use to drive the plow.

This early plough could be used to fully cultivate the farmland, so that the harvest was greatly increased, and with the increase in food supply, the population growth rate also increased, compared to the hunting era, when the population grew slowly, the number of human beings showed the first major explosion after entering the agricultural age.

Gradually, the farmers improved their ploughs, making sharp "ploughshares" with pointed ends that could more effectively cut through the soil, adding a "bottom plate" that pushed the soil to the side and tilted, and in this way, the plough was gradually improved.

Su Yan has the image of the ox-powered plow and the man-powered plough in his mind, the ox-powered plow is much larger than the man-powered plow, the ox-powered plough is stronger than the human power, and the larger plow can be controlled, the human power is smaller, and the efficiency of the man-powered plow is much different from the efficiency of the ox-powered plow, and the depth of the cultivated land cannot be compared with the ox-powered plow.

Considering that the dragon tribe will not be able to obtain cattle until a few years later, and the number of cattle is not necessarily small, I am afraid that for a long time, the human plow will have a great effect on the dragon tribe, at least the efficiency of the human plow is higher than that of the hoaxe.

Su Yan has the image of the ox plow and the manpower plow in his mind, which does not mean that Su Yan can quickly build the ox plow and the manpower plow, and Su Yan was stumped when he sketched the design of the manpower plow and the ox plough in the first step.

Su Yan drew the general graphics of the manpower plow and the ox-powered plow, and the appearance was already different from the image in Su Yan's mind in many places, after all, most parts of the plow in modern times are metal structures, and the dragon tribe does not have the conditions to create a plow with an all-metal structure.

Next, the various components of the plough should be sketched out, which stumped Su Yan, after all, Su Yan had not personally fiddled with the plow, and he did not know much about the specific structure of the plow, so he could only make the plow by himself, and if he failed, he could gain some experience, and he could always build the plow.

The ox-powered plough was put aside for the time being, and Su Yan found two "old" carpenters to try to make a man-powered plow, except for the plowshare that needed copper to build, most of the rest were wooden structures, which was a carpentry job.

However, at the end of spring ploughing, the applicable manpower plough was still not made, only three defective products were made, which were barely usable, but they were very difficult to use, and they had to continue to improve.

……

The shipbuilding area is located in the north of the smelting area, very close to the jungle, what wood is needed for shipbuilding can be cut directly in the jungle, of course, the wood must be processed before it can be used for shipbuilding, this time is often as long as more than a year, according to the shipbuilding plan set by Su Yan for the carpenters, the carpenters prepare a large amount of wood in advance for shipbuilding.

It is similar to making a recurve bamboo bow, the bamboo used to make a recurve bamboo bow should be placed in the house to dry for more than a year, but it is a pity that the bamboo forest near the bamboo city was burned down, not completely burned, and the bamboo forest can still grow in the future, but I don't know how many years it will take to restore the scene before the fire, and the new bamboo forest has not yet been found.

In the shipbuilding area, there are two wooden ships under construction, dozens of carpenters and apprentices multiplied by two, and other clansmen will come to help when needed.

The size of the two wooden boats is almost the same, with reference to the seventh wooden boat built by the Dragon Tribe, it can be said that this kind of wooden boat is the first batch built wooden boat of the Dragon Tribe, six zhang long, one and a half zhang wide, can carry more than ten tons of cargo at a time, and can carry about 100 adults at a time.

This is probably the largest ship in primitive times.

Su Yan did not give the wooden ship a name, only a simple code name - a type A boat.

The first A-type ship is A-1, the second A-type ship is A-2, the third A-type ship is A-3, and so on, there will be B1, C1 or something in the future.

The A-type boat is also the first wooden ship with a sail built by the dragon tribe, and the sails of the first class of the first can still not be turned, and in the later A-boats, they will try to improve it, so that the sails can be turned, and when the ship enters the river hundreds of zhang wide, it can drive downwind or against the wind.

Don't look at the size of the A-type ship is not very big, but the construction time is relatively long, and it is fast to be able to build the two ships of A2 and A3 in late autumn, or because of the lack of carpenters, if only one A-type ship is built, it can be completed in early autumn at the latest, and now it is to build two A-boats, and the personnel are dispersed to two ships, and the construction time will naturally increase.

The A-type boat is enough for the dragon tribe for the time being, and the larger B-type ship will not be tried to be built for a few years, and this year there is only one A-type boat going back and forth between the three cities of the dragon tribe, and it will reach three next year, and then the dragon tribe's ships will travel back and forth on that big river, so that the dragon tribe's tentacles will continue to extend.