When Qin Yi brought more than 30 crops from America back to the Han Dynasty, Lu Bu knew that even more difficult things were still to come. How to cultivate these crops well so that they can take root, sprout, blossom and bear fruit in a new environment is actually very difficult. Lu Bu vaguely remembers that several of these crops have undergone many improvements before they become what they have become.

In addition to letting Ren Jun, the Jizhou Diannong General, be responsible for the cultivation of some crops, Lu Bu also asked the famous agronomist Shi Tao and Chang Lin to join in the cultivation of all crops, including corn, sweet potato, potato, pumpkin, peanut, sunflower, pepper, tomato, pineapple, jaccato, cassava, lima beans, Western apples, sourdough, guava, peas, cashew nuts, cocoa, American ginseng, papaya, and upland cotton. They were all handed over to Shi Tao, Chang Lin and Ren Jun, and began to select local cultivation in Jizhou, Shuozhou and Qingzhou.

The focus of these crops is corn, sweet potato and potato, followed by pepper, peanut, tomato, pumpkin, and sunflower. It doesn’t matter whether the other cultivation is successful or not.

Although corn, sweet potatoes and potatoes have high yields, these three crops have their own disadvantages. Corn is not drought-resistant and the yield is not as good as rice in fertile fields. Sweet potatoes and potatoes consume soil fertility and are not as strong as soybeans. Therefore, they cannot overestimate the main role, seize the staple food status of rice and wheat, and cannot compete with soybeans.

There is another painful lesson in the cultivation of corn, sweet potatoes and potatoes. During the Qing Dynasty, these high-yield crops were widely planted in the mountainous areas of Yunnan and Guizhou, which made the population growth rate in the Yunnan and Guizhou area much higher than that in the Central Plains. However, in the Yunnan and Guizhou area, the vegetation in the mountainous areas gradually decreased with the promotion of corn and potatoes. After the ground cover became crops, the adhesion and cohesion of the surface soil were greatly reduced, resulting in severe soil erosion, river silt, desertion of fields, frequent natural disasters, and agricultural production was greatly affected. The lessons learned from them are worth learning and learning.

Therefore, Lu Bu strictly required that although these three crops should be planted in mountainous areas, they should also pay attention to mountainous vegetation. They should not cut down a large number of mountain forests to make fields. Basically, one piece of land should be divided into three parts of grass, three parts of forest land, and four parts of fields. The forest coverage rate in mountainous areas should be strictly controlled to be more than 50%. This is a big thing that concerns generations and should not be taken lightly.

Shi Tao, Ren Jun and Chang Lin worked hard to cultivate high-yield, high-quality and moderate breeding periods of corn, potato and sweet potato, and at the same time developed intercropping technology of corn, potato and sweet potato.

These three people have developed a set to improve the farming experience of corn, potato and sweet potato.

Before sowing potatoes, the ground must be prepared, with fine, even and loose soil conditions. Then use processed farm fertilizer as base fertilizer. Spread and pour it into the soil evenly in time.

Corn is transplanted with floppy disks, sowed and cultivated at the end of March, and transplanted in mid-April. The field culture of corn should be more fertilizer. First, apply stalk fertilizer early, second, apply ear fertilizer more, third, apply grain fertilizer more, and fourth, prevent and control diseases and diseases.

Sweet potatoes are grown in early April and planted from the end of May to mid-June. Sweet potatoes are cultivated in the fields. First, seedlings are checked for replenishing the seedlings. After five days of planting, seedlings should be checked. After finding lack of seedlings, water them and shade them to promote early survival. Apply eccentric fertilizer after leaching. Promote the seedlings to develop quickly and grow in a balanced manner. Second, cultivate soil, and perform the first intercultural cultivation ten days after planting to remove weeds. Unblock the soil ditch and end the intercultural cultivation before sealing the ridges. The depth of intercultural cultivation should be determined as appropriate. The principle is that it should be deep in the early stage and shallow in the later stage. Each intercultural cultivation should be combined with soil cultivation. Especially for the potato ridges washed by rainwater, soil should be re-blocked to facilitate root extension and prevent exposed potatoes, and then fertilize reasonably.

Under the leadership of these agronomists, the construction corps in various places have successively achieved high yields and were successfully promoted to all farmers.

Since then, the Han Dynasty no longer had the problem of shortage of food. Lu Bu's troops were so good that he could fight south and north calmly.

Because rubber trees were to be planted in tropical areas, Lu Bu had to send someone to hand over the rubber trees to Mu Tuxie, Jiaozhou, and asked him to cultivate rubber trees on Hainan Island.

In order to stimulate Tu Xie's enthusiasm for planting rubber trees, Lu Bu signed an agreement with him to cultivate a rubber tree and reward Tu Xie with 100 coins. Lu Bu prepared to plant 100,000 trees in the early stage. Although the rubber trees were useful, they needed to be planted for six to eight years to cut the rubber liquid. A few years later, Lu Bu found that 100,000 trees were not enough, so he continued to cultivate 100,000 acres of rubber forest.

In fact, to truly develop modern industry, 100,000 mu of natural rubber is not enough, because the planting area of ​​natural rubber in China in later generations has reached 661,000 hectares, equivalent to 9.915 million mu, but it is not enough.

Qin Yi also brought back tobacco, a gadget that integrates the devil and the angel.

He found in many Indian tribes that locals smoked tobacco. The Indians put the tobacco in the sun and dried them, and then hung a small calfskin bag on their necks, a hollow stone or wood, which looked like a tube; when they were happy, they kneaded the tobacco into pieces and placed it on one end of the tube, lit the fire, and breathed deeply with their mouths at the other end, making their bodies completely filled with smoke until they emerged from their mouths and nostrils, just like smoke from a chimney.

Qin Yi asked them why they smoked this thing. The locals said that doing so would keep them warm and healthy. The local priests also believed that tobacco was a plant with special healing effects. It was a good idea to apply fresh tobacco leaves on the wound. Inhaling tobacco, headaches or other diseases.

Qin Yi tried tobacco. At the beginning, the savory taste was like pepper from the Western Regions, which made Qin Yi unaccustomed to it.

When Qin Yi got used to it, he fell in love with the refreshing feeling of tobacco. They were waiting for the crops to mature in the Mayan continent, and when they were bored, they would smoke tobacco. Over time, the remaining more than a thousand people became smokers.

Qin Yi came back this time and brought a lot of tobacco and advocated the large number of planting of Lu Bu.

Lu Bu felt a headache. He didn't like smoking very much and didn't care about tobacco. However, he knew that tobacco was an angel on one side and a devil on the other, which made him, the ruler, dilemma.

On the one hand, tobacco contains nicotine, tar, and smoking is definitely harmful to the human body. It has many harms to humans and may lead to serious diseases such as asthma, pneumonia, lung cancer, hypertension, heart disease and reproductive development. Basically, everyone who has lung cancer smokes.

On the other hand, tobacco is an important source of economic resources for the national finance and a high-tax and profitable commodity. In the 21st century, there were 300 million smokers in China, each of which could consume 2,000 cigarettes per year. In 2010, the national tobacco industry achieved tax profits of more than 600 billion yuan, accounting for 10% of the national fiscal revenue. In addition, tobacco is a high-efficiency crop. Tobacco is mostly in poor areas with relatively backward economic conditions. About 100 million farmers rely on planting tobacco to maintain their lives. Planting a mu of tobacco can collect 1,000 to 2,000 yuan in cash in that year, which is 3 to 5 times that of grain crops. It is an effective way for farmers in mountainous areas to get rid of poverty and improve their living standards.

Lu Bu hesitated and asked Guo Jia what to choose: "A thing is obviously harmful to people, but it can be used to benefit the general public. Should this thing be made public?"

Guo Jia smiled and said, "Lord. You are just asking this question now?! The immortal pill and the Forgetful Pill have been invented for more than four years! Fortunately, it is expensive and cannot be afforded by ordinary people. It has been circulated among the children of aristocratic families and foreign nobles. It does not cause harm to ordinary Han people. I collect billions of money from these two small things every year. The lord takes out half of it to improve people's livelihood and benefit the general public. It is of great benefit!"

Guo Jia's words reminded Lu Bu that since he could even make the Five Stones and Crayfish from later generations. What's the point of being a mere tobacco? What's more, tobacco will only induce certain diseases and will not directly lead to certain diseases. Haven't you seen a great man smoking all year round but living to over 80 years old, and a young man is even more addicted to smoke, but living to over 90 years old. Some people do not smoke or drink but die young. The impact of tobacco on human health is not so absolute.

In addition, tobacco has many potential uses in developing food and drug resources.

Tobacco leaves are rich in protein, and tobacco is about 10%. Tobacco and burley tobacco can be as high as 20%. Tobacco regeneration ability is strong and can be harvested multiple times a year. The tobacco leaves are high. The yield of protein is extracted by fresh tobacco leaves. The yield per mu can exceed soybeans. Other crops cannot compare. The protein extracted from tobacco leaves can make a variety of foods and is widely used. The remaining tobacco leaves can still be used as raw materials for cigarettes.

Extracting nicotine from tobacco leaves to make medicine can prevent and treat people's patients, and making pesticides can prevent and treat crop pests, and its prospects are also impressive.

Tobacco is a famous model crop. It can be used as a bioreactor to introduce other crops' anti-cancer, AIDS and genes that are beneficial to people's health into tobacco for full expression. Then extract them using biotechnology and can be processed into a "golden medicine" for curing diseases and strengthening the body. American scientists have successfully cultivated antibody tobacco in later generations, extracting anti-cancer and antiviral tactile tin from it, which has a good therapeutic effect on lung cancer. Swedish scientists injected human genes into tobacco plants and proposed blood protein activators from harvested tobacco leaves, which can cure heart disease.

In addition, tobacco does have the effects of reducing swelling and detoxifying and killing insects. Mashing fresh grass with external application, or applying it with e-liquid to the affected area can treat swelling and toxicity, tinea capitis, white tinea tinea, baldness, and poisonous snake bites. In addition, make 5% leaching solution to spray, or smoke it, which can be used to kill snails, mosquitoes, flies, and mice.

Lu Bu weighs the pros and cons and definitely develops the tobacco industry. At worst, the price of tobacco will be higher, so that ordinary people can't smoke it, and it can also avoid the poisoning of tobacco to ordinary people.

In addition, Zhang Zhongjing and Hua Tuo can develop some medicine tobacco, mix traditional Chinese medicine with tobacco to make cigarettes, and reduce the content of harmful substances in tobacco. This is not something that Lu Bu said nonsense. In the 21st century, the tobacco breeding research team of Shanxi Agricultural University successfully cultivated nine kinds of medicine tobacco, including ginseng, astragalus, honeysuckle, and mint, which have Chinese herbal ingredients. These medicine tobacco can reduce the content of harmful substances in tobacco and have certain therapeutic effects on certain diseases of the human body. They are very promising new tobacco varieties.

The type of tobacco developed by Lu Bu is naturally flue-cured tobacco. Since this tobacco leaves are heated and baked in the grill room, they are named after the tobacco leaves. After baking, the leaves have golden color, bright luster and mellow taste. They were the main raw materials for cigarettes produced in countries around the world. In later generations, China's flue-cured tobacco production accounted for more than 80% of the total tobacco production.

Because this is a cash crop and cannot compete with strategically valuable grain crops, Lu Bu specifically ordered that tobacco not be allowed to occupy good land when developing the tobacco industry.
Chapter completed!