After Zhang Yi and Jia Siqian left Shanghai, they began to study and travel around the country.

At present, China's cultivated land is mainly distributed in the eastern coastal area, and there are several granaries in the whole of China, which are the Central Plains, Guanzhong, Hebei, Shuzhong, Jiangnan, Jiangdong, Liangguang, and Northeast China according to the development time. In fact, only the Central Plains and Hebei were developed during the Three Kingdoms period.

The Central Plains includes Jingzhaoyin, Yanzhou, Yuzhou, and Xuzhou, all of which are places where grain is produced and rich in products, which is also an important reason why Cao Cao can rise under extreme war.

Guanzhong is the Sanqin region, and it was in the middle of the world when it was in the Western Han Dynasty. Dong Zhuo occupied this place for two years, and Li Dao and Guo Yan occupied this place for several years, until everyone was wiped out by them, and then they were defeated.

Hebei is mainly Jizhou, Youzhou and Qingzhou, and Jizhou is the most. Jizhou has always been the place with the most cultivated land in the Eastern Han Dynasty, since the beginning of Emperor Guangwu, it has been developing here, and after the end of the Eastern Han Dynasty, it has become the first state in the world, and Jingzhaoyin does not have much wealth in it. After Yuan Shao occupied this state, he could compete with his younger brother Yuan Shu. You must know that Yuan Shu occupied Nanyang, Yuzhou and other places at that time, and most of the Yuan family's support.

The development of Shuzhong has been continuous, and it has been developed since Liu Bang, the ancestor of the Han Dynasty. It's just that a few years after Liu Bang sent troops from Hanzhong, a major earthquake occurred in Qinling, causing the road to Hanzhong to collapse, becoming like a new sky. This is also why Zhuge Liang wanted to go on a northern expedition from Qishan, because other roads are difficult to walk, and as long as the army is blocked, it will not be able to get out at all.

In order to enter Shu, King Qin Hui deceived the king of Bashu and opened up the road, which is the story of Wuding's opening of the mountain. The road of Wuding Kaishan is called the Golden Bull Road, which was also broken in the earthquake, but it is still one of the main roads into Shu. In addition, there are Chencang Road, Baochuan Road, Luogu Road, and Meridian Road are the main roads into Shu, but these five roads are not suitable for the army to pass, and the grain transportation is even more.

Therefore, Shuzhong has never been developed, and the real development was actually after Liu Bei entered Shu. Zhuge Liang's contribution to Shuzhong lies in the fact that he turned Shuzhong into a real country of abundance, and the Chengdu Plain truly became a granary, creating a unique culture in Shuzhong.

The development of Jiangnan was even later and lasted for a very long time. It has been developed from the Southern Dynasty to the Northern Song Dynasty, and the most important place is Yunmengze. During the Three Kingdoms period, Yunmengze was known as the eight-hundred-mile Yunmeng, the place was too big, from the Southern Dynasty to the Northern Song Dynasty, people were crowding Yunmengze and turning it into land. Or because of the increase in population, after the destruction of vegetation, soil erosion is serious, and sediment accumulates into Yunmengze, causing changes in the terrain. It is precisely because of such hundreds of years of hard work that Jiangnan has become a granary.

The development of Jiangdong took a longer time, from the Wuyue period, but it was not until the Southern Song Dynasty that the development was completely completed. The reason why this is the case is because many of them in Jiangdong are in Shanyue and there are too many bandits. It wasn't until Zhuge Ke's time that Shanyue was completely pacified. However, during the period of the two Jin and Northern Dynasties, although Shanyue was basically absent, new ethnic groups appeared in the Shanyue area, just like the tribal replacement in the northern grasslands.

In fact, the main reason is that the Shanyue region is too barren, and the Han people disdain to live. In this way, there will definitely be new ethnic groups in the mountainous areas, these people are not necessarily aliens, and they may even be Han Chinese, but when they are despised by other Han people in the mountainous areas, they simply do not call themselves Han people, or they are not recognized by other Han people as Han people, so new alien races appear.

Liangguang is the Jiaozhou area, which was developed until the Ming and Qing dynasties, because of the development of maritime trade, the population here increased a lot. After there were more people, the Liangguang area could be considered to be developed. Especially in the late Qing Dynasty and the Republic of China, it was really developed.

The development of the Tohoku region began in the eastern part of the country, but the degree of development was not large. After the establishment of New China, the Northeast was thoroughly developed, and the black soil where the roe de roe deer was beaten and scooped fish was turned into a granary. It's so cold here, if it weren't for the call of the state, it would be basically impossible for the Northeast to be developed, just like Alaska, if it weren't for the discovery of gold there, basically no one would go there.

Now there are three states under Zhang Yi's rule, Jingzhou, Yangzhou, and Jiaozhou, and these three states have not been developed much, so Zhang Yi needs to develop them one by one now. Jingzhou Zhang Yi didn't want to overexploit, because of Yun Mengze's relationship, the river water basically would not flood, and no matter how much water there was, Yun Mengze would receive it.

If Jingzhou is developed, Yunmengze will disappear. In fact, compared with farmland, Zhang Yi hopes to retain Yunmengze, develop it moderately, and ensure vegetation to prevent too much soil erosion in the upper reaches of the river. What he wants to develop more is Jiangdong, Liangguang and Jiaozhi areas.

The water system of Koto is basically fixed, and there is a large mountainous area in the middle, so even if the soil is eroded, it will not be lost anywhere, because the river here is not large, and it is easy to build a dam.

Zhang Yi and Jia Siqian started from Wu County and traveled all the way south, into Huiji and along the coast to the Shanyue region. Along the way, Jia Siqian is very optimistic about these lands, "These lands are very fertile, as long as they are developed, the lord will not be worried about food." ”

Zhang Yi has gone through so many wars, and his food reserves are running out, and if he wants to start a war, he may need to recuperate for a few more years. But a big war can't be fought, and a small war is still okay. Cao Cao has not yet pacified the north, and Zhang Yi will definitely not give up making small moves.

After the land in the coastal area was confirmed, Zhang Yi and Jia Siqian went directly to Yuzhang by boat. There is also a large amount of cultivated land in the Yuzhang area, especially the water system around Poyang Lake is developed, and the surrounding land is fertile.

After arriving in Yuzhang, Jia Siqian once again made an investigation, "I didn't expect that there is so much land in Jiangdong that is suitable for cultivated land, and there is so much land in Jiangdong, and all of it is developed, which is not bad for any of the three states of Xu, Yan and Henan." ”

Zhang Yi said with a smile: "That's natural, the Han states, except for Liangzhou and Bingzhou, where arable land is scarce, all other states have a large amount of arable land, but it has not been developed." ”

Zhang Yi had already made up his mind to develop Jiangdong, and after the inspection, Zhang Yi immediately appointed Jia Siqian as the general of Diannong Zhonglang, who was fully responsible for the development of Jiangdong, regardless of whether the county officials had to cooperate.