We often say that walking on the country road is very pleasant, because there are always many weeds and wildflowers on the roads in the country. On both sides of the road, some even grow on the road. Although it is wild grass and wildflowers, it is also a walk. Very comfortable, but the big roads built now are not like the country roads, full of weeds, now the road is basically concrete, paved with asphalt, through the car's rolling, basically wants long grass and long Not coming out, because the nature of the soil has changed, but there is a road called Qin Zhidao without concrete, no one has been away for many years, why is there no grass on the road now?

Qin Zhidao, now located in Gansu, dates back more than 2,000 years ago to the Qin Shihuang period. When Qin Shihuang wanted to repair this road, he sent his own son and his most important officials to repair it, but it was easy to do it. It’s hard, this road is not like other roads, so it’s easy to repair. There are not only deserts and loess on this road, but the ancient technology is not as advanced as modern, nor does it say that it is possible to use concrete directly and then put asphalt. It not only prevents desertification, but also prevents the growth of weeds.

Everyone knows that the soil of the loess is very suitable for the growth of weeds, and there are many mountains in Gansu, and it is necessary to prevent the mudslides from completely obscuring this road. Therefore, to solve these problems, we need to plan well. So at that time, in order to have a reasonable road repair plan, the Prince and the responsible minister began to solicit opinions from everyone. Finally, after discussion by all parties, they established a best plan. After reading this plan, I really admire the wisdom of our ancient people. .

In order to prevent this road from growing, it is necessary to first solve the problem of why the grass grows. The long grass is because the soil is suitable, and with the aid of the climate, the weeds grow very fast. If it is not long, it can only be High temperature environment, but high temperature every day is unrealistic, so they changed the nature of the soil, so the soil paved on the road is the "cooked soil" after frying. In order to prevent accidents, the ancients also sprinkled a layer of salt and alkali on the soil layer, thus turning this road into an environment that is not suitable for the growth of weeds. Therefore, Qin Zhidao, which has remained for thousands of years, does not have a grass. Editor / Zhao Jing