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Sun Yi was very depressed, and his own Lidell seemed to be superfluous.

The two unwittingly walked to the wheat field that had been burned last night.

There were croppers walking around the fields. Some tried to lift up the fallen wheat, and some looked at the ashes on the ground and silently wiped their tears.

Sun Yi spoke: "Stuffy, is the food in the camp not enough to eat?" ”

The stuffy man sighed, "It's far from it! The children in the camp only do one thing every day, and that is to find food. As soon as the morning dawns, they go out to dig wild vegetables and pick wild fruits, and the boys go a little farther away to collect wild eggs. I was hoping that the wheat in the summer would produce some grain, but this time it was over. ”

Sun Yi asked, "How much food does a person have to eat in a day?" ”

The stuffy man replied: "Two meals a day, one pound a meal, two pounds of grain a day." ”

Sun Yi couldn't believe it, the only concept he had of the weight of grain was when he was in college, when he went to the cafeteria to buy food, all the boys bought four taels and the girls bought two taels. Breakfast is even less. No, I still eat supper, and the sum of breakfast and supper is estimated to be the top meal. Synthesizing two meals a day is only six taels a meal. ”

Moreover, there were more "jin" in the Ming Dynasty than in later generations. In the Ming Dynasty, 1 catty was 16 taels, equivalent to 590 grams in later generations.

Sun Yi smiled reluctantly: "Stuffy, you can eat too much, I mean ordinary people." ”

"Master, it's ordinary people who are hungry! A strong man has to eat two catties a meal, and a doll eats half a catty, and it is even down to one pound per person! ”

The stuffy man spoke very straightforwardly, and he didn't save face for Sun Yi at all.

"A pound?" Sun Yi looked at the sullen man suspiciously.

Stuffy nodded.

Sun Yi finally confirmed that one pound per meal was the average standard at this time.

Sun Yi believes that any naturally formed standard has its natural significance. For example, the East and the West have formed a unit of length of the "ruler" at the same time, and they are not far apart, because the unit of the ruler is very convenient to use in daily life. If the ancient people ate an average of one "catty" at a meal, this is probably the meaning of "catty".

Sun Yi changed the question: "Stuffy, how much grain can be produced in one acre of land?" ”

The stuffy man thought for a while, "In a normal year, one acre of paddy field can make two stones of rice, one acre of dry land can make one and a half stones of corn, one stone of wheat, and half a stone of buckwheat; Millet and millet are not easy to estimate, and three, five, seven or eight buckets are possible. ”

One stone of the Ming Dynasty was equivalent to 120 catties, which was converted into 240 catties of rice, 180 catties of corn, 120 catties of wheat, 60 catties of buckwheat, and 40 catties to 100 catties of millet and millet on one acre of land.

Sun Yi quickly estimated in his mind,

"According to this amount of food, according to this output, ten acres of land can feed one person!"

"If the whole camp is calculated according to 500 people, it will require 5,000 acres of land."

As soon as Sun Yi muttered, the sullen man immediately reminded, "Master, the yield of the newly opened wasteland is not so high. ”

Sun Yi trembled in his heart, "How much does the newly opened land produce?" ”

The sullen man said, "It's safe to fold in half." ”

Sun Yi sighed!

-- Food is the fundamental problem.

There was a famine in neighboring Shaanxi and other places, and it was impossible to buy grain with silver, so Tiemuying could only rely on self-sufficiency for food.

There is no need to estimate, and at a glance you can see that the current crops are simply not enough to support the rations of 500 people.

Sun Yi immediately realized that the Ironwood Battalion was currently in a very fragile rat racing cycle:

Because of the lack of food, additional manpower is needed to clear the wasteland for farming, and additional manpower needs more food......

In order to get out of this cycle normally, it is impossible to accumulate food without a year or two, that is to say, the number of people in the Ironwood Battalion will be limited to a low level in a year or two, and if there is not enough number, the Ironwood Battalion may be eaten by other forces at any time.

Unless you can find another way, such as borrowing a large amount of grain from God first;

Or, increase the yield per mu of grain, accelerate the jump out of the cycle, and achieve food freedom?

In later generations, the yield of grain per mu often increased to thousands of catties, thanks to improved seeds and chemical fertilizers.

The cultivation of improved varieties is a slow effort, and it will not be effective for ten or eight years;

It seems that the chemical industry will not be launched overnight.

Along the way, he passed through the crop fields, except for corn and wheat, and the other Sun Yi did not know the others.

Stuffy Dan taught Sun Yi all the way, this is millet, this is millet, this is soybean, hemp, sorghum......

When he arrived at a cornfield, he said, "This is hungry land." ”

"Do you want to get rid of it? Hungry waiting for the master outside. ”

Sun Yi thought that what was the matter, it turned out that "fertilizer and water do not flow into the fields of outsiders".

Sun Yizheng had this intention, so he went into the corn field to sponsor the stuffy eggs to soak in good organic fertilizer.

At the same time, Sun Yi sighed in his heart, this is probably the first meaningful thing he did when he returned to the Ming Dynasty through four hundred years.

――――――――

References (not related to the plot, skip for uninterested readers)

China's grain production data

1. According to the "Research on the Yield of Grain per Mu in China in the Past Dynasties" (by Wu Hui), China's most important grain crops are rice and wheat, because their genes have not been fundamentally changed in the past two thousand years, so the yield of wheat has been maintained at 100-200 catties per mu, and rice is 200-400 catties per mu.

2. "The Economic History of Modern Agriculture in China" cites the data of the statistical manual of the Ministry of Agriculture and Forestry of the National Government, which lists the highest grain yield per mu in the Republic of China in 1936, with 355 kg of rice, 151 kg of wheat and 194 kg of corn.

3. The average yield per mu in 2015 by the China Bureau of Statistics

Corn: 786 pounds

Rice: 919 catties

Wheat: 719 pounds

Beans: 239 pounds

4. In 2016, the general yield per mu was dry raw grain

Wheat: 500-700 kg

Barley: 25-300 pounds

Wheat: 150-200 pounds

Buckwheat: 50-100 kg (poor buckwheat, all grown in remote and barren areas, extensive management)

Barley: 530 kg (mostly used as wine and feed)

Rice: 700-1000 catties

Millet: 600-800 catties

Sorghum: 700-900 catties

Millet: 400-440 pounds

Corn: 700-900 pounds.

Peas: 150-250 pounds

White potato: 1100-1500 kg (the Chinese standard converts white potatoes into raw grain, calculated at 1/5)

5. Excerpts from some literature:

The third volume of the Ming Dynasty's "Hejian Chronicles" recorded: "A husband cultivates thirty or fifty acres of land, and harvests more than one stone of wheat per mu"

Qing Qianlong's "Baishui County Chronicles" contains: "Every acre of wheat field is full of land, a stone can be harvested in a good year, the second is seven or eight buckets, the smallest foothill is a certain place, and the mountain is covered with stone and soil, and the field of orange is layered, and the harvest is less than three or four buckets. ”

The "Weinan County Chronicles" of the Republic of China contains: in the 24th year of the Republic of China (1935), 575,000 mu of wheat was planted in the county, with an average yield of 44 kg per mu.

The "Huaxian Chronicles" of the Republic of China contains: in the 28th year of the Republic of China (1939), 243,000 mu of wheat was planted in the county, with a yield of 17.35 kg per mu.

Huantai County, Shandong Province, Republic of China, "Jiaoji Railway Economic Survey Report" cloud:

"Wheat is the most important in agricultural production, and the irrigated land is planted twice a year, that is, wheat must be planted every year. The farmer's plan for the year is all wheat, and the wheat is exchanged for sorghum for food, and the manure and soybeans are used as fertilizer. Watering and fertilizing, regardless of wages, planting method, all harvest. The wheat harvest is not a bad year. The yield per mu of irrigated land is at least 1670 catties, and some people have a harvest of 400 catties. It depends on the amount of fertilizer and the height of the soil. The yield per mu of non-irrigated land is more than 100 catties, and the total output is more than 73 million catties according to 200 catties per mu. Eight-tenths of them were lost in Jinan, totaling more than 58.9 million catties. ”

"Those who water the land and plant wheat twice and fertilize it three times, and those who fertilize sorghum and millet twice. One mu of wheat is usually used for 100 catties of soybean cake, and more than 100 catties to hundreds of catties of human dung, and there are more than double it. Sorghum and millet use less fertilizer. Jinan human dung is the largest sales field in this city. The import of soybean cakes and soybeans has reached a huge number every year. ”

At the end of the Ming Dynasty and the beginning of the Qing Dynasty, Tongxiang Zhang Luxiang's "Book of Supplementing Agriculture": "The field is extremely ripe, the rice is three stones, and the spring flowers are one and a half stones, and then there are them. Dayun has a total of three stones for Chang Er. ”

In the early Qing Dynasty, "Pengxian County Chronicles": "One stone and two buckets of rice per mu are the top, one stone is the middle, and eight or nine buckets are the bottom." ”

The Republic of China's "Guantao County Chronicles" contains: "Bao Gu, the yield per mu of the upper land is 130 catties"