Changjian led Mr. Xue through the alley and stopped in front of an arched door.

Changjian went up and said a few words to the guard. The guard went in to report, and soon, someone came to lead Mr. Xue in. Changjian was waiting for him.

She followed the guard into the same room as yesterday. Other than the maids and attendants, only Lady Liu accompanied her.

Today, the two ladies were both wearing a dress. Princess was dressed in black silk with complicated yet elegant patterns on the satin. She looked extremely beautiful.

Lady Liu wore a light blue dress with white hem. Fluttering butterflies were embroidered on the corner of her dress. It matched well with her beautiful eyebrows and beautiful eyes, making her look very elegant.

The two of them were sitting at the same spot; it was really beautiful.

Seeing Mr. Xue enter dressed in an old-fashioned suit, Princess's eyes narrowed. She didn't change her expression: "Youyang, what are you here for?"

Mr. Xue followed the maid's lead and sat down in front of Princess Pingyang. He placed the box he was carrying on the table and smiled: "Just now, I was packing a few things. I think that Your Highness Yu should be able to use them."

Hearing Mr. Xue's words, Princess Pingyang showed a little interest on her face, "What is it? Did you bring it from the Fowler? "

Mr. Xue nodded and asked: "May I ask Your Highness, have you heard of sweet potato and potato, these two crops?"

Princess Pingyang shook her head. "Never heard of it. What is it? "

Mr. Xue did not answer, but continued to ask: "May I ask, with your Highness' current Tang Dynasty, how much food can be produced per acre of land?"

Princess Pingyang's eyes lit up, "In Guan Zhong, the yield of a superior good field can reach three stones per mu. If it is such a barren land, the yield per mu would be lower."

Three Stones... One stone was equal to ten fights, each battle weighed around ten jins. In other words, the yield of a good field was only around three hundred jins.

As expected, without fertilizer or scientific methods of farming, the food production was extremely low. In addition to all kinds of taxes, there were not many people who could eat their fill. No wonder the people of ancient times had almost no ability to resist disasters. In the final analysis, it was still the food production that was too low.

Mr. Xue made up his mind. He didn't keep any suspense and directly opened the box. He handed the box to the maid: "Please have a look, Your Highness!"

The box contained two sweet potatoes, a potato, a handful of peanuts and a handful of pinch of pumpkin seeds.

Princess Pingyang took the box from the maid and asked with a strange light in her eyes, "What is this? Can you eat it? "

This question gave Mr. Xue a sense of familiarity.

Indeed, you are worthy of being a citizen of my gluttonous country. When you see something, the first thing you care about is whether it can be eaten or not.

Mr. Xue saluted, stood up, and pointed to the contents of the box: "This thing is called sweet potato, also known as Gan Gang, Hong Fu, it has the function of nourishing the deficiency, strengthening the spleen and stomach, strengthening the kidney and yin, it can also be used as food, or as vegetable, it has the characteristics of high and stable production, resistance to drought, low insect pests and other diseases, is easy to plant, easy to store, and produces 1000 kg per mu, which is more than 10 stones! If you can keep up with the fat stuff, the highest you can produce is about twenty stones. "

"Pfft ~"

This was the water that came out of Lady Liu's mouth when she was shocked!

Princess Pingyang was indeed a black-skinned person, she was able to keep her composure. If Mr. Xue hadn't been paying attention to her, he wouldn't have noticed her hand suddenly clench before releasing her grip. She still maintained a calm expression and took a sip of water calmly.

Your Royal Highness, your qi recovery skills are so great, does your father know about this?

Mr. Xue expressed his shame.

Lady Liu clearly did not have her leading qi recovery skills. Her voice was almost changing as she asked, "Clerk Xue, is that true?"

Mr. Xue nodded seriously. This was based on the cultivation level of the ancient era and the lack of fertilizer. Lady Liu leaned forward as if she had lost her composure, her eyes opened wide as she carefully sized up the sweet potato, wishing she could see the flowers.

In this era where the yield per mu was only 300 kilograms, the yield per mu of 1000 kilograms sounded like a myth.

Princess Pingyang slightly closed her eyes before opening them again. "What are the other three? Or is it food? "

Mr. Xue nodded and pointed to the potatoes: "This little thing is called potato, it is also called potato, or potato, like the sweet potato, it is also a food that can be eaten and stored easily. However, it is also easier to plant than wheat and rice. Apart from saline and alkaline soil, as long as you can water it, you can at least produce 3000 jins per mu. "

"Hiss!"

This was the sound of Lady Liu inhaling deeply. Her mouth was so wide that even her teeth could be seen from behind. Well, teeth are healthy, no tooth decay.

Princess Pingyang didn't move. She only closed her eyes and tucked her hands into her wide sleeves. She sat there on her knees, as silent as the abyss.

How patient!

Mr. Xue continued to throw bombs: "The potatoes are in the Fran Machine, someone once hit the yield of ten thousand pounds, but to reach the output of ten thousand pounds, we will need more fertilizer. We can slowly study this, it might not be good to raise the yield to this level, but it will not be difficult to get more than three thousand pounds."

Princess suddenly stood up. "This thing can really produce more than 3000 pounds per mu?"

Mr. Xue raised his right hand and guaranteed with his identity as a member of the youth team: "This is the lowest standard. If you want to increase the output again, you need to keep up with the fertility rate. The key is fertility and planting techniques. "

Princess stood quietly for five seconds, then sat back down and asked, "What's this?"

Mr. Xue continued to introduce, "This seed is called pumpkin, and it can bear fruit called pumpkin. It can also be used as food when you don't eat it. It is said that the melon has the effect of calming the fetus; the vine can clear the heat; and the leaves have the effect of stopping bleeding and relieving the pain." The most useful thing is the melon seeds, which can control and kill the blood-sucking insects.

"The blood-sucking bug?"

"It's a relatively common parasitic disease. Many places in the water are prone to disease. Moreover, this disease is contagious. Often eat some pumpkin seeds and don't drink raw water. It can be effectively controlled and prevented."

Princess Pingyang nodded. "What about the planting conditions and the yield per mu?"

It's easy to cultivate it, but it doesn't have to be farmland. In the forest, you can plant it anywhere near the walls. In the cold places, in the hot places, it's possible to plant it.

Pumpkins were probably the most widely grown vegetables in China. They were grown in the east, south, west, and could be eaten during famine. In the poor mountain regions where transportation was inconvenient, there were people who cooked for children to eat as fruits and snacks.

"What is this thing?"

Princess Pingyang pointed at Peanut. Mr. Xue said, "This is called peanut. The oil is good. It's also a pretty good nut and it's tasty."

Hearing that it wasn't food, Princess seemed to be a little disappointed. She didn't say anything, but stood up and slowly paced around the hall: "The several crops that Youyang took out, have never been cultivated by anyone in Tang Dynasty. "Did Youyang bring these from the machine?"

He probably said it too many times and even lied to Ye Zichen himself. Mr. Xue answered without a change in expression: "Yes, I ate a lot on the way, these are all leftovers."