The irrigation system has existed since ancient times. In the Warring States Period 2ooo many years ago, the famous Dujiangyan was a water conservancy hub integrating water control and irrigation. Not only did Chengdu, which had a lot of floods, transformed from poor mountains and bad waters to a country of heaven. After 2ooo many years, it still had a considerable effect.

However, most irrigation systems are in plains, even in places where transpiration is less than rainfall, desert areas, open canals and gullies, which are prone to problems. The amount of water injected is not even as much as transpiration, which is a huge waste.

Yang Yuanzhao is a time traveler. He is very clear about the role of irrigation. Even this point has to be said to later generations in the era of information transmission. Israel created a miracle of agriculture in desert areas. The method he used was root irrigation, using pipes laid in advance to accurately irrigate the roots, and the purpose of water replenishment has been achieved. The thick soil layer, to a certain extent, reduce transpiration, and plants with root systems can absorb water from the deep soil layer, creating a miracle of the desert.

Water is the source of life and the foundation of food and vegetables. Especially vegetables, if there is not enough water, it will not grow at all. From entering Baotou, Yang Yuanzhao started his career through agriculture. Yang Yue, a student studying in the United States, has this important role. Until now, agriculture is still one of the cornerstones of the country. Seed science, genetics, and even hybridism led by Yang Yue, has formed a complete system, spread throughout China, with tens of thousands of agricultural research institutes and production bases, and is trained every year.

The development of China's agriculture has been developed to grow a large number of good varieties. China's agricultural development has a lot to do with it. Cotton, wheat, soybeans and rice. So far, there have been a relationship of at least hundreds of large items, thousands of small items, ranging from 3 generations to 5 generations and 7 generations. Although the increase is not so obvious compared to before, not a few times or even a dozen times, the change in quality and the slight increase in yields still increase China's grain output to a certain extent.

This is not the era of Baotou. At the beginning, tens of thousands of acres or even tens of thousands of acres. At present, the entire China currently has 3.2 billion mu of farmland on the land currently controlled. Even on a single item, the planting area is more than 500 million mu. Even if it is a one-percent increase, and an insignificant increase of 6 kilograms per mu of land is calculated to be more than 150,000 tons. This number is definitely not small, enough for 10,000, or even more people to eat food for a year. In the current situation of the world war, it is definitely a hard currency.

Yang Yue led the basic agricultural technology, mainly planting and genetics. On the other hand, regarding agricultural planting technology, irrigation, fertilization, etc., it is another aspect. China's fertilizer has also transformed from human body manure base fertilizer to chemical fertilizers. On the basis of the first, it has been developed into fertilizers and compound fertilizers from different periods. These have also been based on the original foundation, which has increased the grain output.

However, irrigation is another project. Needless to say, where there is sufficient water, not only irrigation needs to be considered, but also the problem of waterlogging needs to be considered. However, in arid areas and desert areas within 6, this is very important.

Food is the most important thing for the people. Liu Shu was born as a farmer. He knew the importance of food very well. Although China's land area is huge and it has a large number of fertile land in the Yangtze River Basin and Southeast Asia, who would think there is a lot of farmland? China's fertile land has been developed to a certain extent at present. The southeast coast and Southeast Asia have not had no potential, but on the basis of deforestation at that time, China is currently different from later China. At that time, the huge population pressure at that time had to increase the area of ​​arable land. For many years, even for economic development, the annual arable land was an absolute red line. Once there is an illegal change in the nature of arable land, and there is no sufficient reason, this is a big thing.

In this era, China had a population of only 700 million to 800 million. The most important thing is that the soil and water conservation itself is better. In addition to Yang Yuanzhao's attention, to a certain extent, the environment is better than in later generations, and Southeast Asia is also a granary.

No matter how good it is, someone needs to plant it. Southeast Asia is just a rich place in the hands of the great powers, or even the natives, but in the hands of the hardworking Chinese, it is a paradise that turns decay into magic.

Because of this, China has no idea of ​​cutting down trees and reclaiming farmland in Southeast Asia and the middle and lower reaches of the Yangtze River. Most of the mountains and relatively barren land have been returned to forests. Compared with the meager grain output, it is better to plant trees and naturally.

Even such land has been returned to forests. Of course, it is impossible to cultivate the natural primeval forests in Southeast Asia casually. On the original land, we only look for more suitable plantations to build them. Others will be preserved for the time being. After the growth of China's land reaches a peak, it will naturally fall.

At this time, a brand new irrigation method may invest more at one time on the land, but will not generate much investment, and even change the nature of the land at the level. It turns out that deserts, semi-deserts, and even desert land will become fertile fields. Thinking of this, I can't help but be excited. I don't know much of the land like China, from Shanxi and Shaanxi to the west, large tracts occupy almost half of China's territory. This is the case, even if Tibet is aside, there are many.

The key to root irrigation is the input. Iron pipes are prone to rust, buried in the soil, and often come into contact with water. The cost of copper pipes is too high and not used for a long time. However, this is no problem. China's advantages in polymer composite materials, especially the emergence of all-in-one machines, have been born in this era in advance, such as PP and PV. Materials that are light in weight, strong, corrosion-resistant, and inexpensive, have become the choice of this irrigation method.

Since the materials and irrigation methods are produced, what methods are used, such as how to prevent blockage, how to ensure irrigation efficiency and how deep it is to ensure that one acre of land is, as long as you do more experiments and accumulate some data, just in this way, in a few years, China has formed a system, and in the arid areas of the Three North Shelterbelts, the method of root irrigation was first used to ensure the survival rate of the planted trees. Now, the opportunity to transfer north water to the south has completely popularized this type of irrigation method.

With the support of Yang Yuanzhao, irrigation projects specifically targeting desert areas began to appear. The transpiration effect in these areas is greater than the precipitation. The desert and semi-desert climate formed, long-term humidity polar regions, even if there are rivers, they are called intermittent rivers. These rivers may flow continuously during the rainy season or rainy seasons, and may even cause floods. However, during the drought season, the rivers gradually disappear.

From the historical changes, we can see that water has a huge impact on a region. In the central region, the prosperous Western civilization and even the legend of Loulan were full of precipitation and civilization in that era, but when the rain belt shifted and the address changed, it became a world buried in the yellow sand.

Of course, China knows that the terrible nature of desert and semi-desert areas is terrible. Even large-scale projects such as north-south water diversion, all channels flowing through here are dark, and the same is true for irrigation. The irrigation location is below the ground. The water pipes made of PV material can be irrigated about 1 meter below the land and near the root system. If it is far from the ground, transpiration will occur, but the transpiration effect will be greatly reduced. Such forests have a higher survival rate and relatively small water consumption.

Of course, unlike farmland in desert areas, the number of grain crops has far more roots than the number of trees. If one acre of land is tall, drought-resistant trees, there may be only a few dozen or hundreds of them. In this way, the pipelines laid are greatly reduced. As long as sufficient protection and maintenance are sufficient, it will be enough to continue production for a long time.

Even so, even in some pasture areas, there is no need to design. Just use the culvert to introduce water into specific pipelines and then inject it into the soil on average. As long as the amount of water underground reaches a certain level, the wild grass that grows tenaciously will grow wildly.

Even so, three huge water conservancy projects with a total length of over 30,000 kilometers across the entire northern part of China, plus the manpower required for the root irrigation renovation of at least 10,000 square kilometers is simply unimaginable. On the earthwork, a mu of land is at least 35-50 cubic meters. The transformation of 10,000 square kilometers requires about 100 billion cubic meters of earthwork. In other words, China has engineering machinery farther than the world, and with a nearly huge population, it has barely completed this transformation project that shocked the world.

China uses huge labor, tens of millions of labor from Europe, and indigenous people who migrated from Southeast Asia and even the Middle East, they are ordered to do this. Of course, some of the higher-level work is being done, and the rest are doing this, even the population introduced by Southeast Asia and some other places has used almost 120 million people to plant trees.

Even if a person can plant 10 trees a day, 1.2 billion can be planted every day. According to the 60,000 trees per mu of land, the daily data of 20,000 mu is quite terrible. More than 10,000 square kilometers per day is impossible to plant every day. In addition to the cut and consumed, the net increase of 10,000 square kilometers per year is 10,000 square kilometers per year.

In later generations, the forest coverage rate increased by more than 10% almost every year. However, in this era, a huge land of 100,000 square kilometers has been invested in 120 million manpower in tree planting, which may only increase by about 3% each year. However, when this continues, it is expected to reach its peak within 7 years. By then, the huge forest coverage rate of China will exceed 45%. With the restoration and growth of vegetation, China will completely become a paradise for plants, and its resistance to natural and geological disasters will reach the highest level, and it will change from an industrial country to a livable country. (To be continued.)8
Chapter completed!