After Heizi finished instructing, Wang Tian looked up at the sun in the sky, it was already noon, and he didn't go to everyone to measure the size, and directly told everyone to wash their hands and feet and eat Chinese food, and then measure it after eating.

Then he glanced at the land that had been cultivated, and the chiefs had been working for a week, and now it seemed that the area was not even 30 acres.

With so much labor put into it, it is impossible to reclaim an acre of land in a day, and this speed is no one, and it seems a little difficult to achieve a self-sufficient agricultural civilization before the metal is found.

And this barren land seems to be a little wrong, those slopes seem to be too sloping, there is no problem for growing vegetables, but if it is used to grow food, will it cause soil erosion too serious?

After all, there is not much fertilizer now, and at this current inclination, if it rains heavily, the fertilizer that has been accumulated so hard will be washed away.

Wang Tian had never planted the land, but he felt that he was right to be concerned, and that the sloping land would either be used for growing vegetables or would have to be flattened before he could grow food.

There is no way, there are more than 100 people in the tribe, and none of them can grow crops, not even Wang Tian, and it is another thing that needs to cross the river by feeling the stones.

The vertical excavation of the Luoyang shovel is not convenient for digging soil, one is not sharp enough, the other is the use of a long time, people are particularly easy to get tired.

The use of the hoe can also use the principle of leverage, the Luoyang shovel can be driven into the ground by arm force to excavate, and the cutting edge part used to dig the soil, if the grinding is too thin, it is easy to crack and break.

If the cutting edge is very blunt, it is not easy to fold, but the soil excavated each time is very limited, because it is not easy to turn the soil, so the Luoyang shovel is used to dig the loose soil first, and then use the hoe to turn the ground, and this is actually equivalent to using twice as many people to turn over the same piece of land.

It's not uncommon for this to be slow, and this method is used when building a fence to dig a foundation, because there isn't a lot of earthwork to be excavated, so the inefficiency doesn't seem obvious.

But now it is not enough to replant such a large area of land.

The tribe now needs to use soil for pottery and charcoal, not to mention farming, so it is very necessary to improve the agricultural tools for turning the soil.

Just when Wang Tian was still thinking about these questions, the leader had already come over and asked the Son of Heaven to return to the tribe.

……

After lunch, Wang Tian looked at the two size charts of foot length and foot width in his hand, and couldn't help but be stunned, this primitive person is all big feet.

The size of the foot length is generally 28~30 cm, which is equivalent to the shoes of 43-46 in later generations.

Before Wang Tian crossed over, with his height of 1.8 meters, he only wore size 43 shoes, and the primitive was 1.6 meters tall, why were his feet so long?

Is it because you don't wear shoes for a long time and your feet are collapsing? There are pros and cons to this.

Benefits! It can be a few sizes less, it is simple and easy to do, and the disadvantages are self-evident.

In the end, after statistics, he set the shoe size of adults into three, and the foot length is: 29-31 cm large size, 26-28 cm medium size, and 23-25 cm small size.

Children's models are not divided into such fine, one is already made, 20-23 large size, the other is 16-19 small size, as for the youngest child is 2~3 years old, there is no need to wear shoes, just put on a leather socks.

Wang Tian took a look at the size of the sunspot, and the foot length of this product reached 25 cm, and it is estimated that even the medium size of the adult model can be worn.

After the size was set, the number of each size needed to be made was counted, and then 5 pairs were added to each size except for the smallest size, so that the Tianlong tribe had a total of 139 people, including Wang Tian.

There have been 5 more babies this year, and now there are 144 people in total. Excluding the 30 children who did not need to wear shoes, each pair had to make 114 pairs, plus the 20 pairs that Wang Tian made to prevent the size from being inappropriate, about 135 pairs of shoes needed to be made.

After the size and quantity were set, Wang Tian began to make the template, the sole template was very easy to make, and within an hour all the paper templates were done (painted), and the soles of the four wooden boards were also cut out.

The next four sizes of foot molds were also made, and then the shape of the mold began to determine the unfolded size of the upper.

These 4 sizes took Wang Tian two hours, because with the experience of making the first one, this speed is already considered fast.

Then he took it apart and got a paper template of four sizes of upper unfolded size on white paper, Wang Tian took these 8 paper templates, came to the factory again, and handed them to Kuroko to make pottery plates.

……

Then he began to think about how to improve the tools for ploughing the fields.

In fact, Wang Tian couldn't think of any particularly good way to improve farm tools, before mechanized farming, there were only a few farm tools in the past few thousand years.

The narrow edge of the blade is called a hoe, and Wang Tianji, who has a wide blade, has a comrade-in-arms who calls this kind of hoe "killing tiger shovel", and the Hunan dialect is called "sickle scraping".

Under such conditions in primitive times, there was no metal, and he thought of the most classic primitive ploughing tool.

Legend has it that when Emperor Yan and the others were hunting wild boars together, they came to a woodland and saw a fierce wild boar arching the soil, with its long mouth sticking into the soil, and the wild boar's nose pouted to raise the soil, and after offering all the way, it left a piece of loose soil that had been turned over.

The situation of the wild boar arching the soil left a deep impression on Emperor Yan, and after receiving this inspiration, he began to wonder if he could make a similar tool in such a situation, and use it to loosen the land according to this method.

After repeated pondering and thinking, Emperor Yan tied a short piece of wood horizontally to the lower part of the pointed wooden stick used in the thorn hole, and when using it, he first inserted the sharp wooden stick into the ground, and then stepped on the horizontal wood with his feet to add force to the wooden tip to the soil.

Then the wooden handle to the side, the sharp wood then pry up the clods, so that the continuous operation, then plough out a piece of loose land, which is actually the same as the hoe, and ultimately use the principle of leverage, in order to achieve the purpose of saving labor.

However, the cutting edge can be inserted into the ground more easily through the weight of the human body itself, and then the lever principle is used to achieve the purpose of plowing the land.

This improvement not only deepened the land and improved soil fertility, but also changed the planting from hole sowing to strip sowing, and increased the sowing rate while keeping the land unchanged, so that the grain yield increased greatly.

This kind of tool with horizontal wood, called "Lei" in the historical books, there is a county-level city called Leiyang in Hunan, which is one of the four famous inventions in history The inventor of papermaking, Cai Lun's hometown.

In the process of turning the soil, Emperor Yan found that the curved handle was more labor-saving than the straight handle, so he roasted the wooden handle of the "rake" into a labor-saving bend with fire and became a crank.

This improvement greatly reduced the labor intensity, in order to be able to plough more land at one time, and later the working people changed one pointed end of the wooden "rake" to two, becoming the "double-toothed harrow".

In this way, two ridges of land can be plowed at one time, which greatly saves the time of ploughing the land, improves the efficiency of work, and greatly promotes the development of productive forces.

After continuous improvement, the tip of the wooden rake that ploughs the ground on the soft soil is made flat and becomes a plate-like blade, which is called "wooden rake".

With the cutting edge in front, the resistance to breaking the ground is greatly reduced, and a fierce man like the second brother of King Kong can also push continuously, or there are large livestock such as cattle or horses as the driving force to drag the wood rak forward, which can greatly improve productivity.

After this, it was discovered that the wooden blade was not abrasion resistant and could be easily damaged, so it was gradually changed to stone, bone or ceramic materials.

And the working people creatively made it into standard parts, making wear-resistant plate blade shells, which can be replaced after damage, so that the work of ploughing and ploughing will not stop immediately.

It is only necessary to wait for free time at night to repair the damaged workpiece and save it for replacement in the next run.

It seems that standardized production is not the originality of the Yankees, through the above description, you may have found that replacing any mouth with metal is not the prototype of the plow?!

Wang Tian felt a little strange, isn't Quyuan plough a necessary skill for traversers, why has it been made in the Yandi period?

In fact, what Wang Tian didn't know was that the Quyuan plow, which only appeared in the late Tang Dynasty in China, was only improved by the working people on the basis of the previous straight plow, and it did not appear out of thin air, let alone brought by a traverser.

Belch...! It seems to be a bit of a slap in the face of the author to say this, it doesn't matter that the author is thick-skinned!