Merton nodded and asked again, "Almost all the rivers in Guanzhong Land are muddy!" But which river is the most severe? The more serious it is, the more it exposes the problem. ”

"Weihe!"

Duan Lun said in a hoarse voice.

Now all the courtiers were silent, this time it was not dark under the lamp, but blind, the Wei River flowed from the edge of Chang'an City every day, it was the river they were most familiar with, everyone knew how turbid the water of the Wei River was, but they never turned a blind eye.

"The kid entered the Taiji Hall for the first time, and when he saw that the Wenchen and military generals were divided into sides, a word immediately appeared in his mind, and it was clear." Merton sighed.

"Distinct? What does this mean? Cheng Yanjin asked puzzled, this was the first time he had heard of this word.

"The Jing River is a tributary of the Wei River, but the water of the Jing River is unusually clear, and the water of the Wei River is turbid, so at the confluence of the Jing River and the Wei River, there is a spectacle, the river is half turbid, half clear, and stretches for several miles. ”

The ministers of the court couldn't help but blush, this 'spectacle' is very ironic.

"In this way, the sediment of the Wei River flows from other tributaries above the Jing River." Cheng Yanjin said thoughtfully.

Merton nodded: "Then the question is, why is there so much sediment in the upper reaches of the Wei River!" If the sediment problem of the Wei River can be solved, the problems of other rivers will be solved. ”

Li Shimin took a deep breath and said, "Take the map of Guanzhong." ”

A huge map of Guanzhong was fully unfolded in the Taiji Palace, and Li Shimin looked at the map of the Wei River basin with a gloomy face.

"Black water, bashui, lacquer water, thousands of waters............" The more Li Shimin looked at it, the more ugly his face became, and the entire area of the Weihe River was simply too large.

"According to this analysis, the source of sediment in the Yellow River is in this area." Li Shimin stretched out his hand and drew a rough picture of the area of the Loess Plateau in later generations.

All the courtiers nodded involuntarily, and suddenly their faces froze, and their eyes involuntarily drifted to the top ministers of the court, especially the eldest grandson Wuji.

Guanzhong, especially the Loess Plateau, is the sphere of influence of the Guanlong group, and the eldest grandson Wuji is the representative of the Guanlong group in the court.

Merton nodded imperceptibly, "Yes, now we have to figure out why the soil here has been lost so badly. ”

This time, everyone didn't answer, and Qin Qiong wanted to dissuade Merton, but was stopped by Cheng Yanjin, and opened the bow without turning back, since it has reached this point, there is nothing more to say, retreating at this time makes the emperor unhappy.

Duan Lun glanced at the eldest grandson Wuji, gritted his teeth and said: "This place is full of loess, the soil is loose, and once it encounters rain, the soil will be washed away. ”

Merton nodded solemnly, and saw two dense potted plants outside the Taiji Hall, and said with an idea: "This phenomenon is called soil erosion by the Mo family. If we want to retain sediment, we have to understand how soil erosion is formed, and we need to do an experiment. ”

"Experiments?"

Everyone is no stranger to this word, and the Mojia Experimental Field is famous in Chang'an City.

Merton walked to the potted plant, looked at the huge potted plant, moved it hard, but the potted plant did not move at all, and said to Xi Junmai in embarrassment: "Brother Xi, please do me a favor and move the potted plant on the right outside in the rain." ”

Xi Junmai suddenly had a headache, moving things in the Taiji Palace, you kid is too bold, and he couldn't help but look at Li Shimin.

"Move!" Li Shimin waved his hand.

Xi Junmai took the order, stepped forward with a little force, and moved the potted plant to the rain outside effortlessly.

"Brother Xi, break this basin again and move it outside in the rain."

Xi Jun bought a cheek, Murton had not been to the court a few times, he naturally didn't know that these two plates of potted plants were Li Shimin's beloved things, and Morton had the audacity to destroy the potted plants.

"Folded! If you can solve the problem of the Yellow River, what is the way to do a potted plant. Li Shimin endured the heartache and waved his hand.

Xi Junmai received the order, gritted his teeth, snapped the potted plant, and moved it to the rain.

The heavy rain outside the Taiji Hall was pouring down, and soon the bottom pot of the potted plant was drenched with water, and Modon asked Xi Junmai to move it back to the main hall.

"Your Majesty, please look!" Merton pointed to the storm drains in the two potted plants.

Li Shimin couldn't help but blush when he watched his beloved potted plant being ruined like this by Merton, and it took a long time to calm down.

Fortunately, Li Shimin is a Ming Jun, holding back the anger in his heart, and came to the bonsai, only to see that the rain under the bottom pot of the intact potted plant was very clear, and the broken pot was not covered by leaves, and the raindrops washed the soil directly, and the entire bottom of the pot was filled with turbid muddy water.

Merton said: "Wechen once consulted history and found that in the pre-Qin period, Guanzhong was densely forested, but at that time the Wei River was unusually clear, only because a large number of forests were cut down and reclaimed into land, leaving the loess directly exposed, which would cause soil erosion, just like the broken potted plant in front of me." ”

Many ministers nodded, so it is indeed the cause of indiscriminate deforestation.

Merton sighed: "In fact, what the people don't know is that with the rain flowing away is not only the soil, but also the fertility of the land, will also be carried away with the water and soil, in the long run, the fertility in the farmland will be lost, the land in Guanzhong will become more and more barren and barren, when the grain production will be reduced, the people will not be able to make ends meet, and then the people will reclaim more land in order to survive, and then the fertility of the land will be washed away by the rain, which will be a vicious circle."

Moreover, Weichen heard that the upper reaches of the Wei River have been washed out of a lot of deep chasms, if it is not treated, year after year, the upper reaches of the Wei River will become thousands of ravines, fragmented, like pottery full of cracks, by that time, the once fertile Guanzhong will become a history. ”

After Mo Dun finished speaking in one breath, the entire Taiji Hall suddenly fell silent as if it were dead.

Guanzhong is the foundation of Datang, and it is not an exaggeration to say that it is the dragon vein of Datang, if it comes to that time, I am afraid that the foundation of Guanzhong will be destroyed.

Merton thought of the fragmented situation of the Loess Plateau in later generations, like a knife in his heart, if the soil erosion of the Loess Plateau could be alleviated in this era, maybe everything would still be in time.

"So the people of Guanzhong opened up the wasteland and farmed the land to be the ultimate cause of the formation of sediment in the Yellow River?" Li Shimin said bitterly.

Morton nodded solemnly and said: "Buddhism pays attention to cause and effect, but there is some truth, in fact, many of the bitter fruits of human beings are planted by themselves. ”