At the end of February, in the eastern suburbs of Chaisang, on the bank of Peng Lize.

Zhuge Liang, who has already completed the surrender of the army, finally began to work on the last task that his eldest brother ordered him in the past few days - to familiarize himself with the survey of water conservancy management. This work must be thoroughly mastered before he sets off to envoy Liu Bei, otherwise when he gets there, as soon as Chen Qun asks for advice, he will have to be blinded immediately.

Fortunately, Zhuge Liang was very interested in the principles of nature, and he was willing to tinker with practical learning, and after a few days, he didn't feel tired.

Peng Lize in the Han Dynasty was much larger than Poyang Lake in later generations, but the water level was also very shallow, and the difference between the lake area in the dry season and the wet season was also very large.

In winter, when there is little rainfall, a large area of silt lake bottom will be exposed, and in early summer, the water will be the most, and it will be completely submerged (so you should go to see Lushan Waterfall in early summer).

In the previous dry season, Zhuge Jin instructed people to take advantage of the low water level to fill some positions on the shore that are not much lower than the lake surface during the wet season to ensure that they can also be higher than the water surface during the wet season, and a polder was formed.

The required soil is dug from a lower position, so that the volume and irrigation capacity of the lake area are not affected.

Moreover, the polders are very fertile, and they are all piled up with silt at the bottom of the lake for many years, and they can continue to have a bumper harvest without fertilizing for at least three to five years.

In fact, the amount of construction in the polder is not large, because the silt is very soft and easy to dig.

It's just that ordinary people can't measure the water level difference and altitude, and often the landfill is not in place. If there is a veteran who is good at water conservancy surveying, the situation will be much better.

And Zhuge Liang is obviously "a person with professional knowledge in this area" - he has already learned the mathematics and optical physics scrolls given to him by his eldest brother, and he has also brushed up on paper application problems, so he almost has to do practical work.

The actual combat training of grinding guns in the battle again, not to mention surpassing modern people, but surpassing the level of hydrological survey masters in the Tang and Song dynasties, that is more than enough.

The difficulty of building a polder, compared to building a canal and a sluice gate, is definitely pediatric. However, the principle of optical level measurement is the same.

After Zhuge Liang accepted the polder, he tested a few ditches, wanted to manually adjust the water level and repair the reduced version of the canal gate, and practiced the skills that should be tested.

……

On this day, Zhuge Liang finally felt that his water control skills could barely be discharged.

He was ready to pack up and put the 5,000 soldiers and warships that were to be returned to Liu Zhengnan. With enough military rations on the ship, he will be able to pull anchor and set sail the day after tomorrow, and go down the river to Guangling as an envoy.

Because it was the day of "acceptance of craftsmanship", Zhuge Jin also rarely took time out to accompany his younger brother all day to ensure that his younger brother really learned and learned solidly, and the brothers have been busy working in the polders and irrigation canals outside the city until the evening.

A few days ago, Zhuge Liang was too busy, and Zhuge Liang didn't have the energy to pay attention to other details of life, and he was even thinking about his own business when he rushed in and out of the city every day.

Now that I am in a good mood, when I am in a hurry, I am like a horse watching the flowers, and I have noticed some novelty when I look around.

Zhuge Liang saw that in a polder that had just been rectified, there were farmers sowing seeds with the kind of "scissor-type burrowing planter" invented by the eldest brother last year, and there were ploughing oxen digging ditches with a slightly strange-looking plow.

Zhuge Liang has been dealing with agriculture and water conservancy for more than ten days, and he is naturally in a sensitive period for agricultural tool innovation, so as soon as he saw the plow, he stopped, took off his shoes again and walked into the mud, and took a closer look.

Looking at it, he couldn't help but ask the farmer who was ploughing the land: "Old man, who made this plow?" Why haven't I seen it anywhere else? How long have you Chaisan people been using this thing? Good thing, it's much sharper than other plows when it breaks ground. ”

Those farmers didn't care that there were horses passing by the ridge road, but when they heard Zhuge Liang take the initiative to talk, everyone raised their heads.

When they saw Zhuge Liang's face, the color of his clothes, and Zhuge Jin in the distance, they couldn't help but bow down in the muddy water again and again, but fortunately, everyone was bare-legged when they cultivated the land, and they didn't have to stain their clothes.

"Why is the second son teasing the old man! This plough was not made by the school captain, and when we regained the agricultural time delayed by the Rongrong Rebellion, who of the people of Chaisang did not feel the virtue? ”

After the old farmer finished explaining, he continued to bow down to Zhuge Jin, and finally Zhuge Jin signaled that they didn't need to be polite.

Zhuge Liang was stunned at this time, and turned his head to look at his eldest brother.

Zhuge Jin couldn't help but smile: "This was just made more than ten days ago." Recently, you have been obsessed with water conservancy surveys, and you have passed by the countryside outside the city every day, and you haven't noticed? ”

Zhuge Liang was relieved, and then he was a little itchy: "Did you just make it?" No wonder. In this way, this thing may be improved to be more labor-saving, big brother, have you tried it? ”

Zhuge Jin waved his hand helplessly: "There must be room for improvement if you want to improve, but for the time being, I don't have the energy - if it weren't for the fact that Zhenrong would have made a mistake and caused us to delay spring ploughing in the Jianbi Qingye of Chaisang County."

Nor will I spend this energy because I cannot bear to see the people suffer. But in the end, the effect was just like that, and only five or six agricultural hours were recovered.

Now that the spring ploughing season is almost over, there is no need to rush to change, just wait for the next year's spring ploughing to make a better one. These things should also be kept secret for the time being, don't publicize them indiscriminately, after all, they haven't been changed yet. ”

There is no doubt that the new ploughing tool that Zhuge Jin tried to get was the Quyuan plough in the Tang and Song dynasties, but he was not an agricultural expert, and he didn't know what the so-called straight plow Quyuan plow looked like, so he could only roughly figure out the experiment according to the principles of mechanics.

In the end, the things made may not have reached the level of labor-saving of the Quyuan plough in the Tang Dynasty, but it is indeed better than the original plough in the Han Dynasty. If it can be done well, it can be regarded as a wasteland and labor-saving artifact.

Zhuge Liang listened to his eldest brother's explanation, but he was no longer in a hurry, but just said to himself:

"Now that the spring ploughing season has passed, there is really no need to rush, there is still more than half a year to go. I have to be busy with other things in advance, and when I am free, I can share my brother's worries. ”

Of course, Zhuge Jin was happy to exercise his younger brother, and hurriedly said: "You really want to do this well, first learn the latest two scrolls I prepared for you this time, one volume is arithmetic, 'vector synthesis and decomposition', you have finished learning trigonometric functions, and it should be easy to learn vectors again."

After learning vectors, you can understand how to calculate the resultant force of forces in different tilt directions, and the 'force analysis' of physics can be completely completed. Once you've completed both volumes, you'll try to incorporate these mechanical ingenuity and maybe refine the structure with less effort. ”

As mentioned earlier, before Zhuge Liang and his eldest brother became teachers, the level of mathematics was equivalent to that of the third year of junior high school, and the level of physics was not even the third year of junior high school, but he only finished the optical part of junior high school, and only learned the surface of mechanics.

It is because the force analysis of the mechanical part requires vector mathematical tools, and without a mathematical foundation, physics is a source of water and a tree without roots.

Now to study simple mechanical design, to carry out fine mechanical analysis, it is also time to add the vector part of the first year of high school mathematics, and then gradually add the remaining junior high school mechanics.

Zhuge Liang didn't feel distressed about receiving two more secret scrolls.

Anyway, for him, learning the secret scroll is similar to playing games with others, it is a kind of entertainment pastime.

This time, with the task goal of "improving the quyuan plow" in front of him, he can directly use it after learning new knowledge, and he is even more motivated.

……

Two days later, the Yangtze River wharf in the north of Chaisang City.

Zhuge Liang, who had made all the preparations, took the warfleet and the 5,000 soldiers who returned to Liu Bei, as well as Chen Dao, who was responsible for protecting him all the way, boarded the ship and said goodbye to his eldest brother.

Zhuge Jin finally told the second brother some precautions, and also instructed the second brother to keep his letters, and to pay attention to what to say and what to consider when he saw Liu Bei.

Zhuge Liang said that he would act on the opportunity and not worry. Zhuge Jin didn't talk nonsense anymore.

With my younger brother's IQ, it's a bit of a bit of a bad thing to talk about anymore.

The fleet soon rose to the rocks, and Zhuge Jin watched his younger brother go down the river and disappear into the Yangtze River skyline.

Zhuge Jin sighed, knowing that he would be busy again in the future, and for a long time, there was no second brother to help him.

Yuzhang County's post-war internal affairs farming work, there is still a lot of undealt with.

After Zhenrong was wiped out, the huge amount of seized property that was about to be escorted back from Nanchang would also be re-stored and counted, planned and utilized - Ah Liang, a useful mathematical talent, was gone, and the two sisters could only suffer in terms of accounts.

Fortunately, Zhuge Zhi Zhuge Lan followed his younger brother and also studied and honed arithmetic and bookkeeping for two months, even if it was far less powerful than Zhuge Liang, but it also surpassed the average money and grain official, who made the Zhuge family's arithmetic textbooks awesome.

However, even if the finances and accounts can be outsourced, Zhuge Jin himself still has to deal with the logistics preparations and various emergencies of the follow-up crusade against Zulang.

He also devoted his energy to contact the talented people that Ah Liang was about to recruit from Jingzhou, assign them official positions, and help them smoothly adapt to their posts......

Zhuge Liang's letter to Pang Tong and others had already been sent to Xiangyang ten days before Zhuge Liang himself set off, and it was now about to be delivered.

If the other party leaves immediately, the voyage back from Xiangyang will take six or seven days at most, and Zhuge Jin is really busy.

However, if Pang Tong is willing to come, with his IQ, he should be able to help quickly. You can also train and train yourself appropriately, so that Pang Tong's ability can be improved.

Thinking of this, Zhuge Jin was finally not so depressed.

……

The words are divided into two ends, Zhuge Jin sent his younger brother away, and was busy deploying a new round of farming and internal affairs and preparing for logistics.

Zhuge Liang had nothing to do all the way, and he went down the river, and he could travel 150 miles a day. In just four days, we sailed through Wuhu and were about to arrive in Niuzhu.

When he was bored on the boat, Zhuge Liang had long been accustomed to reading books and learning the secret scrolls given by his eldest brother - this had become a convention, and on the way back to Yuzhang from Jingzhou, he had learned factorization and quadratic equations all the way.

And this time, he also took the lead, focused on research for four days, and learned the topic of "vector" in the first year of high school mathematics, and could apply it flexibly and integrate it.

"That's it? That is to say, the concept is relatively new, and a new way of thinking has been introduced, which is not difficult at all. Okay, then I'll be able to get to Guangling in two days, and I'll finish the 'Force Synthesis Analysis' given by my eldest brother! ”

Zhuge Liang put away the secret scroll he had finished studying, and was about to draw out the second volume. In his mind, he imagined that after he finished learning, he could improve the quyuan plow to be more efficient, and maybe he could make more new farming tools for the benefit of the common people.

However, at this moment, Chen Zhi, who was in charge of protecting him, suddenly rushed into the cabin and warned Zhuge Liang: "Sir, there is a naval army downstream against the current, and the scale is no less than ours, and we can't see the flag clearly. ”

Zhuge Liang was slightly surprised: "Are we now on the south bank or the north bank?" Is it the South Shore or the North Shore that is coming? ”

Chen Dao: "It's all on the north bank, there is Sun Ce's navy on the south bank, and the captain has instructed that you must go all the way to the north bank, and you would rather provoke Liu Xun and Zhang Duo than provoke Sun Ce." ”

Zhuge Liang frowned: "On the north shore where we walked, will Sun Ce come to intercept it?" If it was Yuan Shu, even though he had many generals, Liu Xun's Yangtze River naval army was weak. Xuande Gong occupied Guangling and choked the canal, how could he let Yuan Shu's powerful Huai River army enter the Yangtze River? ”

Only then did Chen realize that something was wrong, touched his beard and said, "That's true." ”

Zhuge Liang: "Let the soldiers prepare for battle, but don't panic, continue to sail along the north shore, and wait until you see the flag of the incoming ship before you deal with it." ”

Chen Zhi took the order and went to observe the work of a cup of tea, and the two fleets sailed in the opposite direction, approaching very quickly.

Chen Zhi finally saw that the opposite side seemed to have the banner of Yuan Jun, and he was shocked, but soon found that the other party also played the trick of changing the flag, lowering the flag of the rear general and replacing it with the flag of the general of Zhengnan.

He didn't dare to relax his vigilance too much, but first told Zhuge Liang the good news, indicating that someone was coming to greet him, but told Zhuge Liang not to go out of the cabin, so as not to have a bad arrow for a while.

The two sides continued to get closer, and the other party was really not hostile at all, getting closer and closer, and Chen Zhi finally confirmed that it was a friendly army to greet him.

The two fleets were no more than a hundred paces apart, and the opposite ships began to turn around, preparing to go down the river in parallel.

On the ship, suddenly a brocade-robed general came out of the cabin, stood on the deck and shouted while arching his hands: "Is it Zhuge Kongming? Han Zhengnan's general Yicheng Tinghou led Liu Bei, the assassin of Yangzhou, and came to greet him. ”

Chen Zhi was not shocked until this moment, he originally thought that the lord had sent a naval army general to greet him, but he didn't expect to come in person. He immediately rushed back to the cabin and told Zhuge Liang the news.

Zhuge Liang hurriedly put down the "Heli Analysis" and walked onto the deck in surprise.

And Chen Zhi had already preemptively helped him introduce him, and shouted at the top of his voice: "Lord! I'm Chen! Mr. Zhuge is here! ”

Zhuge Liang finally saw Liu Bei clearly, and replied with a throat: "General Lixian Corporal, rare in the world!" The mountains and wilderness are scattered, how dare they be generals who go hundreds of miles to greet them. ”

Liu Bei had already instructed the helmsman to continue to bring the boat closer at this time, so that he could see the other party's face clearly, and sure enough, he was six or seven points similar to Ziyu, but his face was not long.

And the three or four points that are not like each other are exactly not like the direction of being more handsome and elegant, and they are like gods.

Liu Bei only felt fascinated, even if he had doubts about what Song and Ziyu had said, they all disappeared at this moment, and he arched his hand and said: "Beicong Brother Ling, Ling Tang, I have heard Mr. Ling's name for a long time, and it is an honor to meet you today."

This time, it was only because of the counties in the south of the Yangtze River, from Wuhu down, that there were many Sun Ce's water troops provoking him, which was afraid to disturb Mr. Therefore, he personally led the navy to meet him three hundred miles against the current, but he never thought that he would come late, and Mr. had already traveled to Niuzhu before he met. ”

Liu Bei said, seeing that the two boats were very close, he hurriedly signaled Chen Zhi to help Zhuge Liang retreat, and then instructed the hook hand to hold the boat on the opposite side and slowly tighten the rope and set up the cone springboard.

Two guards with good water nature jumped over the boat first, and then Liu Bei also jumped over the boat under the escort of the guards.

Zhuge Liang was a little moved when he saw this scene.

He recalled that two and a half months ago, on the day he and his eldest brother reunited, on the surface of Peng Lize Lake, the water waves were obviously much calmer than on the Yangtze River. At that time, Gan Ning also wanted to take out a hook and jump gang, but the eldest brother told the fleet to land first.

Of course, the eldest brother's stability is very right, but General Liu's performance today is obviously even more rare.

Zhuge Liang: "The mountains and wilderness are scattered, young and frivolous, and they really don't deserve a general's gift!" ”

Liu Bei: "Mr. Ziyu is in my brother's robe, he has the grace of survival and death, and Mr. is also a great sage in the world. Sir, go back and sit in the cabin! ”