Liu Bei pulled Mi Zhu, Jian Yong, and Tian Yu to the side to discuss: how to bring back the Youzhou Paoze family from the sea.

Zhuge Jin finally had a chance to breathe, he saw that today's business had been done, and the Song family's self-reliance had been witnessed by everyone.

You can talk about the rest of your official business anywhere, and there is no need to occupy the territory of your uncle's house.

So he suggested that Song Xin announce the dismissal of the banquet and send most of the guests out of the house, among which the red tape does not need to be repeated.

Zhang Fei didn't care about the etiquette after drinking, and took the lead to leave, and the other people who had no excuse to stay also dispersed one after another.

But there are still several groups of people left, rushing to talk to Zhuge Jin about things and ask for all kinds of instructions.

Zhuge Jin had no choice but to lead the rest of the people to another side hall and continue to borrow land to entertain guests.

He saw that Chen Qun was the most prepared, and he actually brought a stack of manuscripts to him, so he wanted to do Chen Qun's business first.

Unexpectedly, Chen Qun was still very discerning, and took the initiative to propose: "The affairs on my side are relatively slow, so Mr. should deal with the requests of others first." ”

This sentence is not only humble, but also a little pressure on the people next to you: if you are also tired, then be self-conscious!

Zhuge Jin raised his eyes and saw that the rest of the people left behind were not Liu Bei's subordinates, but representatives of the local gentry in Guangling.

After all, Liu Bei's subordinates came to him to talk about business, and they usually had time, so there was no need to take advantage of the opportunity to entertain.

As far as the local gentry were concerned, there would be no such shop after the village. Zhuge Jin is already a captain of 2,000 stones, and he is only twenty-one years old, how can they usually have a chance to meet him?

Zhuge Jin had no choice but to apologize to Chen Qun, and then chatted with Bu Long and Wei Hui, the two local clan elders: "I don't know what to teach?" ”

The second elder did not dare to support the big, and said again and again: "I can't talk about seeing the teaching, since the last time I entrusted my grandson to engage in greetings, I have not had the opportunity to meet today, and I have this opportunity to inform the captain of some recent situations: The nephew heard that the captain has established a reputation and protected the territory and the people, and he is also very excited, and he will return from Wu County in the near future."

It's just that they have been away from their hometowns for a long time, and the local officials have changed frequently, and I am afraid that they will not recognize a few acquaintances after returning to their hometowns, and they also ask the captain to help introduce them and meet more new friends for the sake of their classmates......"

Bu Long also wanted face, and he didn't dare to directly say that he would ask Zhuge Jin to help ask for officials, but only said that he would help introduce some contacts and friends.

How could Zhuge Jin not understand the subtext.

This kind of thing is normal, just like a year ago, when the two of them were classmates and fresh graduates looking for jobs.

A year later, one of them became the captain of the imperial court, and the other was still working as a melon farmer, so he would definitely go to the captain.

Fortunately, Buqi's academic ability is not bad, and it is not considered nepotism if it is recommended, but only meritocracy.

In fact, the last time Zhuge Jin heard Liu Bei mention Buqi and Yan Ji to him, he knew that Liu Bei had already started to solicit -

There is no way, who let the rumor of "Bu Qi, Yan Zhicai and Zhuge Jin are only between Bozhong" be heard by Liu Bei.

Zhuge Jin is tantamount to fishing for a favor in vain, why not do it?

He also said generously: "Zishan Xiandi's talents and learning, any county and engagement, are more than enough. It's just that I'm still young and my qualifications are still shallow, so I need to go through it slowly, so I don't have to worry. ”

The people of the two families of the guards were immediately overjoyed, and they thanked Zhuge Jin again and again, but they didn't know that Zhuge Jin actually didn't pay anything.

Bulong's words flickered, and he wanted to come up with some conditions to please him, to show gratitude, and put a long line to catch a big fish.

But Zhuge Jin was too busy with business, so he prevaricated and fooled him, and didn't give him a chance to speak.

……

It took a stick of incense before and after to send away those who sought officials.

Only then did Zhuge Jin say sorry to Chen Qun, who had been waiting on the other side, and then began to sort out the business.

Chen Qun came here for the "cash-for-work" thing that he talked about a while ago.

In the past few days, he has prepared a lot of materials, read "Guanzi" carefully, and also reviewed the record of Sang Hongyang in "The Biography of Cargo Colonies".

So this topic cut smoothly, Chen Qun came with ideas, just like the PPT of the later generation report project.

Zhuge Jin only needs to listen first, and then comment a few words.

I only heard Chen Qun report: "I checked the documents of the fields and acres in each county, and I also visited everywhere, and found that Guangling's agriculture has a great weakness. If it can be replenished, it will be able to greatly increase the production of grain and rice. ”

"What weakness?"

Chen Qun took out a map, pointed at it, and said: "Judging from the map, Guangling County is extremely vast, and the whole territory is plains, but the grain production and population are not as good as those below. ”

Zhuge Jin asked thoughtfully: "Could it be that Sheyangze occupies too much area?" In fact, can the flat land of Guangling be twice as large as that of Xiapi? ”

Chen Qun: "When I counted, I had already deducted Sheyangze." And although Daze occupies a vast area, it is conducive to irrigation. For example, Zhenze (Taihu Lake) is beneficial and harmless to Wu County. ”

Seeing that the other party did not make low-level mistakes, Zhuge Jin nodded and encouraged: "That's good, go on." ”

Chen Qun: "Later, when I made an in-depth investigation, I learned that although Guangling has a lot of arable land, it produces little grain, mainly because of insufficient irrigation and salty brine in the land.

The ditch makes Guangling have the advantage of the canal, but it also often causes the tide to pour into the canal through the Yangtze River and shoot Yangze. Especially in the high tide season, the water is slightly salty and bitter. ”

Zhuge Jin suddenly said: It turned out to be a problem of saline-alkali land.

In his previous life, as a gold medal teaching and training lecturer, he also had a lot of common knowledge about history and geography. He knew that the northern Jiangsu region had never been a land of fish and rice in ancient times.

Now it seems that the agricultural constraints in northern Jiangsu at different stages in history are actually caused by different reasons:

Before the Song Dynasty, it was because of the Guangling tide that caused the seawater to pour into the canal from the Yangtze River, forming a saline-alkali land.

After the Song Dynasty, although the Guangling tide and backflow were gone. However, in the Southern Song Dynasty, the Yellow River was diverted and seized into the sea to form Hongze Lake, and the Huai River was seriously flooded. It was not until after the founding of the People's Republic of China that the main irrigation canal in northern Jiangsu was repaired.

It can be said that saline-alkali land and floods are each responsible for the poverty of the North Jiangsu Plain for a thousand years.

The era in which Zhuge Jin lives now belongs to the first thousand years. Therefore, as long as the saline-alkali land is solved, the northern Jiangsu Plain can be turned into a land of fish and rice.

Thinking of this, he couldn't help but be eager in his heart.

Of course, there are several kinds of saline-alkali land in Guangling.

Some saline-alkali land is too close to the sea, and the groundwater itself is very salty, so there is no way to save such land, and it is better to develop a salt drying industry in the future.

What can be saved is only the part of the saline-alkali land caused by the backflow of the tide.

Chen Qun has done a good job of homework in the past few days, and has also inspected some places on the spot, and cooperated with the accounts and land registers of previous years.

According to his estimates, the proportion of these two types of saline-alkali land is about 55 kai.

Therefore, if the tidal backflow can be solved, half of the saline-alkali land problem in Guangling County can be solved.

As a result, the area suitable for agriculture in Gwangneung County will be greatly increased, and the yields of many existing fields will also be increased, and it may even accommodate several times the agricultural population in the future.

……

Chen Qun calculated this expected income clearly for Zhuge Jin, which was indeed very tempting.

But Chen Qun can only go so far.

He had 40,000 men on hand for a winter's time.

But how to make use of these labor, how to plan, construct, and solve this problem, Chen Qun is helpless.

He is not a water expert.

Zhuge Jin is not a water conservancy expert, not to mention that he has just finished listening to the report, and now he thinks that his brain is not so fast.

After pondering about a cup of tea, Zhuge Jin said casually:

"Have you ever considered building a gate between Hangou and the Yangtze River? In normal times, the gate can be opened for navigation, but once the tide rises, it will be closed, and the salt water will not be able to enter the canal. ”

Although Zhuge Jin rarely came to Yangzhou in his previous life, he studied and worked in Qiantang for many years, which is also a city at the beginning of the Grand Canal.

He had visited the Canal Museum several times, and he knew that the kind of locks that could be navigable between different water levels did not appear until the Qing Dynasty.

But if it is just a simple gate to isolate the tide and navigate without considering the difference in water level, then this technology existed in the Sui and Tang dynasties.

To be precise, after Emperor Yang of the Sui Dynasty rebuilt the Grand Canal, the Hangou sluice gate was built in Yangzhou during the Zhenguan and Yonghui periods in the early Tang Dynasty, in order to prevent the tide from backing up. This led to the fact that Yangzhou in the Tang and Song dynasties was much richer than Guangling in the Han Dynasty.

From the Han to the Tang Dynasty, this technical span is not large. It is possible to overcome it with some ingenuity in using your brain.

It's just that Zhuge Jin hasn't thought of how to overcome it yet.

And Chen Qun was of course taken aback when he heard this.

As a native of the Han Dynasty, he certainly hadn't heard of a floodgate that intercepted rivers:

"Sir is saying...... Build a sluice gate that, when lowered, is enough to cut off the entire canal? Kehangou is the high water level at the north mouth of Lianhuai, and the water level at the south mouth of the river is low.

After the gate is dropped, the water flowing from the Huai River will not flow out, and it will be stored in the canal, and the water level of the southern section of the river and Sheyangze will be raised.

The canal is deep enough not to overflow. However, the shores of the lake are flat, and the surrounding low-lying areas may be flooded with impounded water. In the future, the gates will only be opened for navigation when the water level of the river is fixed for a few hours a day and the water level of the river is almost high due to the tide. ”

Chen Qun thought of several disadvantages in one breath.

Sheyangze is a lake in the middle of the Hangou Canal, similar to Hongze Lake in later generations.

The reason why there is a drop at both ends of the ditch, but the river is still not dry, is that it relies on the water of Sheyangze to regulate and store.

Zhuge Jin listened to Chen Qun's ability to raise these new questions, and he had to praise him for doing his homework carefully, these are all good questions.

Zhuge Jin also saw the demolition move and asked: "In the low-lying and muddy land around Sheyangze, are there people farming?" Usually, when the tide backs up, the water level will rise, right? In this kind of place, there should be no fertile land. ”

Chen Qun replied in response: "No, at most, some people occasionally plant water chestnuts and lotus roots, but there is no fertile land, and no one settles on the edge of the swamp." ”

Zhuge Jin flashed a thought: "That's not it, anyway, the water level rises and floods all the rotten land, and no one has planted it." You might as well take advantage of this time to mobilize the people to dredge and rectify the surroundings of Sheyangze.

You can estimate how much the water level will rise if the gate is built, and then take half of it as the dividing line. Dig low weirs and high to form polders, and then plant reeds and solid mud on the new lake shore to prevent collapse.

And this construction method, the silt you want to dredge is exposed, which is several times less effort than digging the bottom silt? If you don't take advantage of the low water level before the water impoundment, when will you wait?

In this way, there will be a lot of fertile polders after the deed is completed, and the water storage depth of Sheyangze can also be improved, which is convenient for long-term irrigation, killing three birds with one stone. ”

Zhuge Jin casually said a bunch of benefits.

In fact, there is another one, but he didn't think of it for the time being.

That is, once the canal has a sluice gate and the water level is raised, there is no need to rely on the current special boat to run the transportation, and maybe it can be directly changed to the Mijia big boat.

In this way, in the future, the labor of loading and unloading dock workers in Huaiyin County and Guangling County can also be saved, and there is no need to change the loading and unloading of river boats and canal boats.

As for the "30,000 workers" who have lost their jobs because of this, they can directly change their careers to Juntun. Anyway, there is no need to worry about planting land this year, but what is lacking is population and labor.

Chen Qun was completely shocked by the pie painted by Zhuge Jin's reverse painting,

I didn't expect Mr. Ziyu to be able to draw inferences from one case to another and bring out so many benefits.

Chen Qun only felt a dry mouth: "Does that gentleman know how to repair the gate?" ”

Zhuge Jin: "I don't know for the time being, but give me a few months to talk to someone, maybe I can think of it." ”

Chen Qun was anxious: "But I can't start work with a 'maybe', in the past two months, what have you asked those people to do in exchange for work?" In winter, the farming season is not waiting for anyone. ”

Zhuge Jin thought for a while: "Didn't I say it, the gate won't be repaired, you can dredge Sheyangze and build a polder first, and when the gate is repaired, it will be completed." ”

Chen Qun: "However, I don't know how much the water level will be higher than it is now, how high the polders should be, and how high and low the terrain should be." And if the last step of building the gate can't be completed, the manpower in front of it will be smashed down in vain, isn't it too careful? ”

Zhuge Jin: "It won't be smashed in vain, at most this year, it will definitely be done next year." As long as the cash-for-work workers don't get too tired, control the rate of food consumption.

Now we have drift gillnet fishing, as well as some other subsidies, and Yun Chang's side also divided his troops to go to Yuzhang to eat. These food shortages are enough to cover the cost of cash-for-work.

You just have to say that this is what I suggested, and you will not object. ”

Zhuge Jin has already figured it out: some of the difficulties that Chen Qun is still emphasizing are mainly problems in engineering survey.

For example, I don't know how to measure the altitude of various places around Yangzawa, and I don't know whether the water line is high or low when I measure it, so I don't know how deep I have to dig and how high I want to pile it.

But these problems can be easily solved by those who have a thorough understanding of mathematical ideas in later generations.

For example, even if a person doesn't know trigonometric functions, as long as he understands the "light propagation in a straight line" and "similar triangles" in the fourth grade of elementary school, and knows how to use them, he can easily measure altitude with ancient tools.

Most people don't know how to do it, but they don't understand it thoroughly enough and don't know how to apply it, not because they don't have enough knowledge.

In "Bright Sword", a thumbs up can measure how far the Sakata United is from the mortar, which is the reason.

Zhuge Jin was very sure that he would be able to solve these small problems if he was given some time.

Even if he doesn't have time to solve it himself, he can let Ah Liang practice his hands when the time comes.

I believe that with Ah Liang's flexibility of thinking, as well as the mathematical foundation and optical foundation that he has tutored him in the past two months, he has been in the dense volume.

As long as he is given another compass stone that can be used as a level and has been available in the Han Dynasty, and a few reference benchmarks, Ah Liang can measure the altitude by comparing his middle finger.

Before Zhuge Jin was going to Yuzhang this time, he wrote a letter to Ah Liang, asking Ah Liang to try to get out and meet him in Yuzhang, so that the follow-up would also save the brothers the trouble of being in two states and distance education.

Zhuge Jin calculated that if Ah Liang finished learning his first batch of scrolls, then the level of mathematics would at least be improved to the level of finishing the second year of junior high school, and he would be short of the two contents of "quadratic equations" and "factorization" from the third year of junior high school.

Coupled with the basic optical knowledge in the physics scroll, this is enough to do the planning of the polders after the canal gate and the water level of Sheyangze rises.

It can also let Ah Liang learn and sell now, which will come in handy immediately, and as soon as he debuts, he will first leave a reputation of "a virtuous minister who controls water" in the history books.