Irrigation system, ancient times, more than 2,000 years ago in the Warring States Period, the famous Dujiangyan, is a water conservancy hub that includes water control and irrigation, not only in one fell swoop to make flood-prone Chengdu, from the poor mountains and bad water, into the country of abundance, to more than 2,000 years later, still has a considerable role. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

However, most irrigation systems are in plain areas, even where transpiration is less than rainfall, desert areas, open channels and ravines, which are prone to problems, and the amount of water injected is not even as high as transpiration, which is a huge waste.

Yang Yuanzhao is a traverser, he is very clear about the role of irrigation, and even this has to say that in the era of developed information in later generations, Israel created a miracle of agriculture in the desert area, the method he used is root irrigation, with the pipeline laid in advance, accurate irrigation in the roots, has achieved the purpose of replenishing water, thick soil layer, to a certain extent, reduce transpiration, plants with developed root systems, can absorb water in the deep soil layer, and create a miracle of the desert.

Water is the source of life, but also the foundation of food and vegetables, especially vegetables, if there is not enough water, can not grow at all, from the beginning of entering Baotou, Yang Yuanzhao started through agriculture, Yang Yue such a child in the United States has this important role, to now, agriculture is still one of the cornerstones of the country, with Yang Yue led by seed science, genetics, and even hybridization, has formed a complete system, all over China, tens of thousands of agricultural research institutes, as well as production bases, Every year, it is enough to cultivate a large number of good varieties in China's agriculture, and the development of China's agriculture has a lot to do with it, cotton, wheat, soybeans and rice, up to now, has formed at least hundreds of major items, thousands of small items, less than 3 generations, more than 5 generations and 7 generations of the relationship, although the magnitude of the improvement is not so obvious compared to before, not several times, or even more than ten times the improvement, but the change in quality, the slight increase in output, these, or to a certain extent, to improve China's grain production.

At present, the whole of China, on the land currently controlled, has 3.2 billion mu of farmland, even if it is a single single item, the planting area is more than 500 million mu, even if it is an increase of one percent, an insignificant increase of 6 catties per mu of land, calculated down, it is also more than 1.5 million tons, this number is definitely not small, enough for 3 million, or even more people to eat a year's grain, in the current situation of world war, definitely hard currency.

On the other hand, on the other hand, about agricultural planting technology, irrigation, fertilization, etc., is another aspect, China's fertilizer, also from the beginning of human manure based fertilizer, transformed into chemical fertilizer, and then on the basis of the above, and developed into fertilizer and compound fertilizer in different periods, which are also on the basis of the original, improve the output of grain.

However, irrigation is another project, and where there is plenty of water, it is not necessary to take into account not only irrigation, but also waterlogging, but in arid areas, inland desert areas, this is quite important.

Although China's land area is huge, with the Yangtze River Basin, a large number of fertile fields in Southeast Asia, but who will think that there is much farmland, China's fertile land, for the time being, has developed to a certain extent, the southeast coast and Southeast Asia, not without potential, but at that time to deforestation on the basis of the above, China at present, different from later generations of China, at that time huge population pressure, must increase the area of cultivated land, for many years, even for economic developmentThe annual farmland is also an absolute red line, and if there is no reason to illegally change the nature of farmland, it will be a big deal.

In this era, China's population is only seven or eight billion, and the most important thing is that its own soil and water conservation is relatively good, coupled with Yang Yuanzhao's attention, to a certain extent, the environment is better than that of later generations, and there is the granary of Southeast Asia.

In a good place, someone must plant it, Southeast Asia is just a rich land in the hands of the great powers, and even in the hands of the natives, but in the hands of the industrious Chinese, it is a paradise that has turned decay into magic.

Because of this, China does not have the idea of cutting down trees to make way for farmland in Southeast Asia and the middle and lower reaches of the Yangtze River, and most of the high mountains and relatively barren land have been returned to forests, which is better than the meager output of food, and used to plant trees to enrich nature.

Even such land has been returned to forest, the natural primeval forests of Southeast Asia, of course, can not be reclaimed casually, on the original land, just looking for a more suitable plantation, the rest of the temporary preservation, China's land growth, to a peak, will naturally decline.

At this time, a new irrigation method may be on the land, a one-time investment is larger, but it will not produce much successive investment, and even change the nature of the land from the level, it turns out that the desert, semi-desert, and even desert land, will become fertile land, thinking of this, I can't help but be excited, China does not know how much such land, from Shanxi and Shaanxi to the west, large tracts, occupying nearly half of China's territory, are like this, even if Tibet is also a lot.

The key to root irrigation lies in the input, the iron pipe is easy to rust, itself is buried in the soil, and often in contact with water, the cost of copper pipe is too high, and the use time is not long, but this is no problem, China's advantages in polymer composite materials, especially the emergence of the all-in-one machine, many popular materials in later generations, were born in this era in advance, such as PP and pvc, this light weight, high strength, corrosion resistance, and the price is not expensive materials, has become the first choice for this irrigation method.

Since the materials and irrigation methods come out, what kind of methods are used, such as how to prevent blockage, how can an acre of land ensure irrigation efficiency, how deep can it be, as long as some more experiments are done, and a part of the data can be accumulated, just like that, in a few years, China has formed a set of systems, and in the arid areas of the three-north shelterbelt, the method of root irrigation and water replenishment was first adopted to ensure the survival rate of the planted trees.

With the support of Yang Yuanzhao, irrigation projects specifically for desert areas began to appear, in these areas transpiration is greater than precipitation, the formation of desert and semi-desert climate, long-term humidity polar regions, even if there are rivers are called intermittent rivers, these rivers may be in the rainy season or rainy season, rushing endlessly, and even causing floods, but in the drought season, the rivers gradually disappear.

From the changes of history, we can know that the impact of water on a region is huge, once in the central region, the prosperous civilization of the Western Regions, and even the legend of Loulan, in that era, it was full of precipitation and civilization, but when the rain belt shifted, after the address changed, it became a world buried in the yellow sand.

Of course, China knows that the desert and semi-desert areas are terrible, even if it is a large-scale project such as the north-south water diversion project, all the channels that flow through here are dark, and the irrigation is the same, the irrigation site is below the ground, and the water pipe made of PVC material can be irrigated about 1 meter below the land, close to the root system, far away from the ground, there will be transpiration, but the transpiration is greatly reduced, the survival rate of such a forest is higher, and the consumption of water is relatively small.

Of course, this is different from the farmland in the desert area, the number of roots of food crops, far more than the number of trees, an acre of land, if it is a tall drought-resistant tree, may only have dozens or hundreds, so the laying of pipelines is greatly reduced, as long as there is sufficient protection and maintenance, it is enough to produce for a long time.

However, even in some grassland areas, there is no need to design at all, as long as the water is introduced through culverts to specific pipes, and then evenly injected into the soil, as long as the amount of water in the ground reaches a certain level, the tenacious weeds will grow wildly.

Rao is so, three across the entire northern part of China, a total length of more than 33,000 kilometers of huge water conservancy projects, plus at least 1 million square kilometers of root irrigation transformation, the need for manpower, is simply unimaginable, just on the earthwork, an acre of land is at least 35-50 cubic meters of earthwork construction, 1 million square kilometers of transformation, the need for earthwork is as high as 100 billion cubic meters, that is, China, with far more than this world of construction machinery, coupled with a huge population, Only then did he barely complete this renovation project that shocked the world.

China uses a huge amount of labor, tens of millions of laborers from Europe, plus the indigenous people who migrated from Southeast Asia and even the Middle East, they are all ordered to do this work, of course, some of them are working at a higher level, and the rest are doing this, even including Southeast Asia, including the population brought in from some other places, almost 120 million people are used to plant trees.

Even according to the fact that a person can plant 1.2 billion trees a day, according to 60 trees per mu, the daily data of 20 million mu is quite terrible, more than 10,000 square kilometers per day, it is impossible to plant every day every year, plus felling and consumption, a net increase of 1 million square kilometers per year.

In later generations, the forest coverage rate increased by more than 10% almost every year, but in this era, the huge land of 30 million square kilometers, invested 120 million manpower in tree planting actions, may only increase by about 3% per year, but when this continues, it is expected to reach a peak within 7 years, when the huge forest coverage rate of China will exceed 45%, plus its own vegetation restoration and growth, China will completely become a plant paradise, The ability to resist natural and geological disasters is the highest, and it will turn from an industrial country into a livable country. (To be continued.) )