The new type of plough mentioned by Zhang Ru is the Quyuan plow.

This is an advanced plough that has just emerged in Hebei today.

Compared with the straight plough of the past, the curved plough is not only smaller in size and lighter in weight, but also increases the depth of the trough by adding a plow rating to adjust the depth of the trough.

The advent of the curved plough changed the previous need for two oxen to plough the land to be completed with only one ox.

At the same time, due to the smaller size, the curved plough can be more suitable for use in small plots such as mountains and terraces.

After observing carefully for a long time, Li Zhi couldn't help but sigh at the wisdom of the ancients.

Li Zhi then visited several other iron farm tools that are now widely used, including rakes, sickles, shovels, and so on.

Li Zhi carefully searched in his mind for the styles of farm tools he had seen in his previous life.

Then he tried to draw a large harrow plough that was suitable for use in dry fields.

This kind of harrow can be pulled by oxen, and a larger area of land can be leveled at a time.

Subsequently, he proposed a pointed shovel with a curved curve and a digging shovel that was conducive to excavation based on the existing flat-top shovel.

Since his knowledge of agricultural implements was so limited, he could only propose improvements in this area.

However, even so, in Zhang Ru's opinion, it is already a very great idea.

He and Liu Hui looked at each other in surprise and then said, "Your Highness really lives up to your reputation, and you can propose so many improvements just by a little observation, Your Majesty really admires it." ”

Li Zhi said: "Lord Zhang has won the award, this king is just speculation, and the specific effect still needs the two adults to find someone to try." ”

Zhang Ru said: "At present, there are still many places in the spring ploughing season, and the lower officials will try and promote it as soon as possible." ”

Li Zhi then talked about the main purpose of coming here, that is, to discuss with Zhang Ru and the others how to select and breed.

He doesn't know much about this, but he knows a little bit because he has produced experimental instruments for customers.

At present, the breeding method of the Tang Dynasty still mainly adopts the panicle selection method, that is, the selection of plants with good growth and full grains for the next season.

This method is time-consuming and laborious because it is carefully selected in the field every year.

So Li Zhi explained some of the modern breeding methods he knew to the two.

These include the establishment of a breeding base for improved seeds, which will be planted separately from ordinary farmland.

The purpose of purification is achieved by continuously eliminating inferior and improved varieties.

In addition, there is also the plant identification method, which is to plant the improved varieties with similar growth status separately and set different growth conditions for comparison.

It is then cultivated according to different growth characteristics.

Finally, a large number of strains with promotion value will be sown, and the output of improved varieties will be promoted to all parts of the country.

After Li Zhi's thoughts fell into the ears of Zhang Ru and the others, it was like thunder.

They had been engaged in agriculture for half their lives, and they never imagined that they would be able to breed good seeds like this.

Li Zhi's method completely broke the previous model of individual breeding for each family, and concentrated more improved varieties.

In this way, not only can the method of intensive cultivation be used to select the best of the best, but also can be cultivated according to the growth environment of different regions.

Zhang Ru and Liu Hui got up almost at the same time and saluted Li Zhishen.

Zhang Ru opened his mouth and said: "His Highness's intelligence is really worthy of his reputation, and the lower officials are not as good as His Highness. ”

Li Zhi said: "Master Zhang, don't be modest, you are busy with official business all day long, you have no time to think about it, this king is just idle and has nothing to think about." ”

Liu Hui opened his mouth and said: "Your Highness doesn't need to ease your cheeks for your ministers, I am already doing this for the sake of my duties, but now I still need His Highness to come up with a good plan, I am really ashamed." ”

Li Zhi said: "Lord Liu doesn't need to be like this, I just hope that this king's suggestion will be helpful to the two of you." ”

Zhang Ru said excitedly: "Although His Highness's law has not yet been implemented, the lower officials will definitely be very effective if they think about it, so the lower officials will send people to purchase improved varieties for experiments, in order to fully implement them in Datang in the coming year." ”

Li Zhi nodded and said, "This will bother Lord Zhang." ”

After saying this, he continued to speak: "Now that merchants from various countries frequently come and go in Chang'an City, this king has privately purchased seeds from them for many crops, and this time I want to ask Lord Zhang to send someone to help supervise the planting situation. ”

This is another purpose of Li Zhi.

Liu An had already collected a lot of plant seeds for him, but due to his limited time, he only had time to grow cotton.

He wanted to borrow a few men from Sinong Temple to help him open up some experimental fields outside the city.

After Zhang Ru heard Li Zhi's request, he immediately agreed without hesitation.

This matter can not only help Li Zhi, but also cultivate some crops that can be promoted for Sinong Temple, so why not?

Next, the three of them chatted a few more words, and then Li Zhi took a few seconded officials from Sinong Temple back to the palace to get seeds.

Li Shimin was busy with Li Zhi's case, and his previous travel plan could finally continue.

It just so happened that Empress Changsun had recently been depressed due to the matter of Changsun Shunde, so they quickly left Chang'an City.

After Li Shimin and Empress Changsun left, Li Chengqian was left to supervise the country.

Fang Xuanling, eldest grandson Wuji, Li Jing and others naturally got busy.

As a result, Li Zhi studied on his own while focusing more on the ironmaking workshop.

Li Zhi wanted to develop some special steel as soon as possible, so that he could use his mechanical knowledge to speed up the industrial development of Datang as soon as possible.

There is a small blast furnace in the ironmaking workshop, which is specially used for various experiments.

Li Zhi, Li Su and Bakken were leading people to develop stainless steel at this time.

Li Su is responsible for refining some metal mixtures that are not used in large quantities.

Among the raw materials used was a type of chromite that was purchased exclusively from merchants in the Western Regions.

This thing is not known at all except for Li Zhi and Li Su now.

Even the merchants who sold it to them were selling it as if it were ordinary peridot.

The reason why chromium is refined is also thanks to Li Su.

After learning a lot of analytical methods, he always tried his best to find various minerals for research.

And chromium was discovered by accident while he was studying peridot.

Now that merchant has been fooled by Pei Mingli into becoming Lin De's exclusive supplier, all his peridots can only be sold to Li Zhi.

In addition to the merchant from the Western Regions, there were also several Hu merchants from Mobei.

They are also supplying Li Zhi with many metal minerals.

These minerals were handed over to Li Zhi and asked him to try to smelt.

Li Zhi is very bad now.

He not only asked Li Su to experiment with metal minerals, but also asked him to experiment with air.

He told Li that he could classify various substances into gases, metals, non-metals, and earth.

And he also left Li Su with homework, so that he could find a way to distinguish the minimum mass of the various substances.

To put it bluntly, he was using experimental methods to let Li Su discover the periodic table by himself.