It has been 2 years since the Taoist priest left Luhegou.

The previous year was fine, but last autumn the harvest was not good. The villagers easily survived the winter, pinched their fingers, and even the old and the young died in the ditch, and a total of more than 30 people died. During the Spring Festival, the Xu family was prosperous, but the ordinary farmers in the ditch lived a miserable life.

Youkai from the mountains also come to join in the fun. A family went to the mountains to look for acorns to eat, and when they were later discovered, they had turned into a piece of white bones, and the old people in the village said that they were eaten by the elephants in the mountains.

These prompted Xu Wenshan: You are now a reed that can only think, and you don't need the whole other world to deal with you, you only need a few monsters to kill you.

You don't even need a few monsters, the poor mountain and bad water of Luhegou can trap you to death.

However, Xu Wenshan did not despair. Since he can only think, let the weapon of thinking be used more thoroughly.

In this world's calendar, there are only more than 300 days in a year, but according to the observation of the past two years, the calendar is quite accurate. On the day of the spring equinox, Xu Wenshan inserted a bamboo pole in the ground, took a ruler and kept measuring the shadow of the bamboo pole.

On the day of the vernal equinox, the day and night are equinoxed, and the angle of the sun at noon is calculated by trigonometric functions of the shadow and rod length, and then the latitude of the regression line is calculated through the interval of the spring and autumn equinoxes, and the local latitude can be calculated.

According to Xu Wenshan's calculations, the local latitude is about 22 to 25 degrees, and the latitude of the Tropic of Cancer is about 20 degrees.

Luhegou is near the Tropic of Cancer.

It's not really good news, but it could be good news. Because this latitude is a magical latitude.

Near this latitude is either particularly bitter or particularly awesome.

For example, at this latitude, there are the Arabian Peninsula, North Africa, the Midwest of the United States, and Central Asia, all of which have subtropical desert climates. Because this place is controlled by the subtropical high pressure zone all year round, it is like a stuffy pot, with prevailing downdrafts and a lack of precipitation all year round, resulting in the inability of agricultural development.

However, there is a place near this latitude that is blessed with a brilliant agricultural civilization. That place is the middle and lower reaches of the Yangtze River Plain in China, where for various reasons, a unique subtropical monsoon climate has formed.

Agriculture laid the foundation for the development of a civilization to a large extent, and the climate greatly determined the level of agriculture of that civilization.

Only two countries in the world have large areas of subtropical monsoon climates. One is the Celestial Empire, and the other is the United States. Feel it.

So this climate is a magical climate, and this latitude zone is a miracle latitude zone.

The problem is that although Luhegou is in this latitude zone, it has not formed such a magical climate, but a more bitter one.

Xu Wenshan is almost certain that this continent, starting from Luhegou to the east, as soon as you get out of the mountains, you will encounter a large area of subtropical monsoon humid climate, where there is abundant water and heat, and the fertile fields are thousands of miles. However, due to the dense mountains around Luhegou, like a wall, blocking the humid air flow brought by the east monsoon, the lack of precipitation has led to the formation of a bitter desert climate here......

Previously, the Taoist priest said: "Two thousand miles to the east is the endless sea, here to the west is the Wuliang Mountain, three thousand miles to the north is the wasteland, and three thousand miles to the south is the rainforest." It can corroborate Xu Wenshan's judgment. Luhegou should be inland, and there is a large ocean in the east, this geographical condition is somewhat similar to the geographical location of southern China in the previous life, but Luhegou is in the west.

Fortunately, there is also the "Wuliang Mountain" in the west, and every summer, Luhegou will enter the flood season, and there are two half-dead streams that will be filled with cool water. According to Xu Wenshan's analysis, there is a plateau on the other side of this "Wuliang Mountain", where the annual ice and snow melt water will flow through Luhegou, so the seeds of civilization will sprout in this mountain col.

It's just that two streams are not enough. Due to the constraints of water resources, the cultivated land area of Luhegou is limited, resulting in the current livelihood of the people, and the status of their own family is also in jeopardy.

If the water problem of Luhegou can be solved, it will become a cornucopia in the mountains.

It is necessary to harness water conservancy. This is Xu Wenshan's conclusion.

However, water conservancy is not something you want to do, you can do it if you want to. He is only the son of a landlord's family, and he has no righteous reputation, let alone people to carry out water conservancy work.

At present, the peasants are busy with their own affairs, and they will not listen to you without some authority and inducement.

Moreover, if one peasant is drawn to work, one less peasant will plough the land. Luhegou's low labor force and his own small grain stock can afford a few farmers to work without production?

These problems cannot be solved overnight.

Before he knew it, it was late at night, Xu Wenshan turned off the lights and went back to his room to sleep with a candlestick.

Xu Wenshan spends his days in the study thinking and studying, and after coming out of the study, he has to go through a dirt road to get to the bedroom.

He held a candle in his hand and spread his shadow messily on the fence, Xu Wenshan looked up at the sky, the bright moon was hanging high, and it seemed that tomorrow would be a sunny day.

Xu Wenshan pushed the door into his bedroom, put the candle on the table, and was about to untie his clothes, when his eyes swept away, and he suddenly felt that there was enough shadow on the bed.

Xu Wenshan's body froze in place, not daring to move.

He was sure that there was someone there.

Or rather, it's not people who are there.

"You're back." The man sitting on the bed spoke, and the voice was a woman.

And the sound is familiar.

Xu Wenshan suddenly felt that this scene was familiar, the same thing happened once two years ago.

"It's you who ......," Xu Wenshan said, "You won't be ...... in ten years."

On the bed is the temple lady Lu Ze, who was suppressed by the Taoist priest himself 2 years ago.