Wei Renshi was happy and asked, "How does Master Liu know that I came to see him on purpose?" ”

"The food in the pavilion will not be more delicious than the wine restaurant restaurant in the county, you don't go to Fuchang and come to this pavilion, you know that there must be other purposes." Lin Sumian smiled: "As soon as you came in, your eyes were on him, as if you recognized him." and deliberately watched him treat others and speak, but he knew that he came for him. ”

"You both see it?" Wei Renshi said with a smile: "This is the shopkeeper who will greet me in Luoyang in the future." ”

"This dam is ......," Liu Yuxi urged.

Wei Renshi didn't drink the water in the bowl, afraid of parasites, so he pushed forward and said, "This word has to be separated, one is to build a dam and the other is to silt." ”

"This dam is the construction of a dam. However, this type of dam is not the same as a normal dam. Wei Renshi explained to Liu Yuxi: "This kind of dam does not need to be particularly high, but like a step. The place to repair is not the location of the ordinary dam repair, but is selected in the flood ditch. The overflowing water flows down the dam step by step, and the sediment in the water is settled. Therefore, Master Liu could choose a narrow part in the small ditches and rivers in Weinan that were caused by the flooding of waterlogs, and take soil from the mountains on both sides to build a dam with the same height as the mountain, so as to completely lock the entire ditch. Then small dams are built step by step, and in the event of flooding, the flood water will inevitably flood into these ditches. At this point, the flood water was allowed to accumulate in the ditch. ”

"And after that?" Liu Yuxi asked.

Wei Renshi replied: "This second step is silting. The water accumulates in it, which provides a reservoir for the locals. It doesn't take a day or two to run out of water, so in times of drought, the water stored in these small dams is available to the people. And these small dams are built step by step, supplemented by the original dams, and can realize layers of impoundment, once the flood, it can play a large role in flood detention, and the upper and lower protection, can prevent the flood from carrying sediment to impact the downstream, causing harm. ”

Liu Yuxi's face was overjoyed, and he had already figured out the joints.

"Not bad! It does! Liu Yuxi praised: "Wei Langjun is really talented! How can I come up with such a way! ”

Wei Renshi smiled: "This is not over. The ditch is blocked by layers of dams, and the river water is silted up in the middle layer. All the sediment was deposited and gradually silted up into the ground, thinking that Pyongyang could be used to grow autumn wheat. The silt in these rivers is all high fields. This kind of dam land has fertile soil, drought and flood to ensure harvest, planting things, and the yield per mu is extremely high. ”

After that, Wei Renshi said: "The dam of Weigou can hold water, can retain silt, and can be used to dung fields through dredging, which is beneficial to agriculture and water." The method of building a large weir to save water and control water is used in the Yellow River, but it has not been seen properly, because it carries too much sand, and the capacity of the weir shrinks too quickly. However, if it is scattered as a ditch, it is equivalent to hundreds of millions of small reservoirs, which have their use but no disadvantages, and have the benefits of dung fields, and can also become fertile fields by themselves. Master Liu, why not? ”

Liu Yuxi's face was pleasantly surprised, and his eyes were constantly shining, obviously he had thoroughly understood the method described by Wei Renshi, and countless ideas had appeared in his mind.

After a long time, Liu Yuxi sighed, looked at Wei Renshi, and said with a smile: "A certain has been established, and he has been in the world for nearly 20 years, and today he is convinced by a young Langjun who is not yet an adult. ”

Looking at Liu Yuxi's admired look, Wei Ren was a little ashamed in his heart.

This damming and silting is entirely the collective wisdom of the working people on the Loess Plateau.

It is also a good method to control drought and flood and soil erosion on the Loess Plateau that has been practiced and used since the Ming Dynasty, which is in line with the concept of comprehensive management of small watersheds advocated by the state later.

But Lin Sumian next to him sighed and said, "This is a big skill, it seems that I usually like it, it's just a small skill." ”

Wei Ren was puzzled and looked at him.

But his expression was a little gloomy, and he said: "My family was originally in Putian, Fuzhou, and it is also a gateway in the local area. I, Lin Cen, was originally a concubine in the family, but I was the first to be admitted to the Gongsheng examination. My family does not regard my family as a concubine, and does their best to provide for me to go to school, and I have always had the ambition to benefit the people. But I also liked the art of the mechanism since I was a child, and my family has suppressed it a lot with its strange and clever skills. Then I went to Beijing and saw the world's scholars, young and roundabout, old and rotten, only poetic words, empty talk. Worship the officials, and most of them are inactive ministers. I don't like it, and I don't want to be like them. Disheartened, I threw myself into these 'tricks and tricks', which, in my opinion, can really help people, far more useful than those poetic arguments. Just like Wei Langjun's plough, once it is made, it can directly benefit hundreds of people. Can you shrink into your study and write poems? The clan was very disappointed in me, so they began to devote themselves to my brother again, and I was sent to Weinan to take care of the clan's business in Weinan. ”

Wei Renshi didn't know that he still had such a side when he looked bold, so he didn't speak for a while. From Fuzhou Putian to Weinan, this is really far.

But I heard him say again: "This trip back to Changgu is really worth the trip!" The plough made by Wei Langjun can benefit hundreds of people, and the watering mechanism he makes can also benefit hundreds of people. At present, this dam and silt land is planned, which can not only control the disaster of floods and droughts, but also add countless fertile fields. I originally saw the plough made by Wei Langjun, and I thought that this is also a person who is as obsessed with those so-called 'strange tricks and tricks' as I am, and I also saw the ingenious plough, so I wanted to come and see it. But I just heard Wei Langjun's dam silt, this is the blessing of the people, the skill of the world, the realm and ability are higher than me Lin Cen doesn't know how high. Fang Jue is addicted to me, but it is just a small skill, Wei Langjun's chest is thinking, but it is a great skill in the world! ”

"I'm just standing on the shoulders of so many great men, so I know something that no one else knows right now." Wei Renshi shook his head, whispered something that neither of them could understand, paused, and said with a smile: "If Brother Lin likes these 'strange tricks', you and I can communicate more in the future." ”

Lin Sumian was stunned for a moment, then overjoyed, and hurriedly raised his hand and said, "Thank you, Brother Wei!" Brother Wei Gaoyi, keep it in mind! ”

"Hehe, Wei Langjun has a magnanimity and a big mind, and he will definitely be extraordinary in the future!" Liu Yuxi said with a smile next to him: "This method of damming and silting the ground, after a certain family went back to Weinan, they immediately started to try it." If it is successful, this policy will be locked up, which will benefit hundreds of people in my Guanzhong, and make countless more fertile fields in my Datang Guanzhong! ”

Wei Renshi had already turned his head at this moment, and looked at the performance of Sun Laohan's nephew again.

He told Liu Yuxi the method of damming and silting the land, but he had a good impression of Liu Yuxi.

Who in later generations has not learned a few poems by Liu Yuxi?

Thousands of sails passed by the side of the sinking boat, and ten thousand trees in front of the sick tree - what an open-mindedness and open-mindedness, and what tenacity and hope.

Although Liu Yuxi has not yet written this poem, this does not prevent Wei Renshi, who came from later generations, from having a good impression of him.

So I thought that I had met it anyway, and if I had a strong and chance, I would help him.

As for whether Liu Yuxi wants to do it or not, and how to do it, he doesn't care at the moment, and he doesn't have the ability to care about such a big thing for the time being.

Over there, there were fewer people, and Sun Laohan's nephew was a little more idle and was sitting there resting.

"Then little brother, come on." Wei Renshi shouted at him.