Chapter 210 Xiao Zhao
The girl leaned over and held up Sang Yu's left hand, gently kissed the base of her hand, and said something silently.
Then he turned around and left without stopping.
The door opened silently and closed silently.
After a long time, Sang Yu, who was 'asleep', let out a sigh, and his right hand, hidden under the pillow, loosened the dagger he had been holding tightly.
She is not a naive person, nor is she a saint who thinks that if she saves others, the other party will be grateful to her.
There are so many stories about the farmer and the snake, and about repaying kindness with enmity. Children of this era tend to mature more precociously, and no one can predict what they will do.
So she hid Sang Yongjing's dagger under her pillow early on, and pretended to be asleep until the girl fell asleep completely.
The little girl probably didn't expect that Sang Yu could tell whether a person was sleeping soundly or not by his breathing rhythm.
When she came closer, Sang Yu was almost ready to attack, because she really couldn't imagine what else the other person could do besides killing her when he was so close to her.
But before she could do anything, the other person grabbed her left hand, and what happened next was even more beyond her expectations.
Since the other party is determined to leave, then let's go. I just hope she can arrive in Lingnan City safely.
Her mind was in a mess, and Sang Yu herself didn't know when she fell asleep. When she woke up and went out, she saw that the sun was already high in the sky.
She was just about to go to the stream to wash up when she caught a glimpse of a figure huddled outside the courtyard gate and was startled.
"You..." She wanted to ask, "Didn't you run away last night? Why are you back now?"
But when he saw the girl's pitiful appearance with water droplets hanging on her hair and eyelashes and her curled up body, he couldn't bear to ask.
"Forget it, come in and have something hot to warm yourself up."
After eating a bowl of white porridge sprinkled with sugar, the girl, whose face was pale from the cold, finally had some color on her face. It was unknown how long she had been freezing outside.
After finishing his porridge, Sang Yu asked her, "Do you still want to leave? If so, I'll take you to the city."
The girl wanted to nod and agree directly, but she didn't know what she thought of. In the end, she shook her head slightly and decided not to leave.
"You don't have to leave, but you can't run out without saying a word like you did last night."
Sang Yu originally planned to heal her injuries and then send her to the city to learn embroidery or other skills to make a living. It was just right that she didn't leave now.
"By the way, what's your name? I can't keep calling you 'hey' or 'eh' all the time."
Name? A trace of sadness flashed in the girl's eyes, and she shook her head slightly.
Is this because they don’t want to say it or because they don’t have a name?
Sang Yu simply assumed it was the latter and thought for a moment before coming up with a name for her: "Then I'll give you one. How about calling you Xiao Zhao?"
The word "Zhao" means new life and brightness. She doesn't know the other person's past, but hopes that her future life will be like a new life, full of brightness.
The girl nodded slightly, and then she had a new name - Xiao Zhao.
Having one more person at home doesn’t seem to make any difference to life as before, it’s just a matter of adding one more pair of chopsticks.
Xiao Zhao obviously had no interest in going out with Sang Xinghao to play with people of the same age. What she liked most was to follow Sang Yu, quietly watching her do things and helping out.
What Sang Yu is busy with now is the vegetable greenhouse that she had been thinking about for a long time.
In fact, the prototype of the later vegetable greenhouse already exists in the contemporary world, but it is not called a greenhouse, but a fire room.
A closed roof is built with bamboo and wood as the frame, a building similar to a simple shed. Rice husks, charcoal and other materials are burned day and night to maintain the room temperature, and straw mats are covered to enhance insulation at night.
However, the fuel cost of this type of firebox greenhouse is too high and most people cannot afford it.
Another method is to utilize geothermal resources, divert hot spring water to irrigate vegetable plots, and achieve early maturity of fruits and vegetables.
Both methods require certain financial resources or geographical advantages, which Sang Yu cannot obtain, but she also has her own methods.
Children who have lived in rural areas know that rural residents generally make their own compost or dig special biogas digesters.
Under closed environmental conditions, biogas digesters use microorganisms such as bacteria and archaea to decompose organic waste and continuously produce biogas.
Biogas can provide farmers with cheap and high-quality fuel, and biogas liquid can be made into fertilizer and feed, saving resources and improving the environment.
With existing technology, Sang Yu certainly cannot create a tool that can convert biogas, but she can learn from the principles of biogas fermentation.
Since the fermentation of manure will increase the temperature, why not take advantage of this characteristic of fermentation to replace open flame heating through bioenergy conversion.
The winter in Lingnan is not as severe as elsewhere. Many wild plants can survive the winter, and the plants grown by Sangyu are all cold-resistant plants, so there is no need to keep them particularly warm.
She plans to first build a frame for the two vegetable plots with bamboo and wood, and then cover it with thick parchment paper coated with palm oil to form an insulation layer.
Then, in the aisle in the middle of the vegetable field and around it, pits were dug and filled with cow dung and sulfur powder to increase the temperature.
If you encounter extremely low temperatures, you can burn charcoal to supplement heat in a timely manner.
By doing this, the two vegetable plots planted in the yard can be guaranteed to survive the winter safely, and their family can also eat fresh green leafy vegetables in winter.
There were plenty of bamboos in the mountains behind the Sang family. After cutting them, the father and son carried them home and then dug a hole under Sang Yu's command.
When digging the vegetable field before, Sang Yu had anticipated that if it was too close to the mountain wall and it rained, the vegetables planted on it would easily be washed away by the falling rain, causing them to drown.
Now is a perfect time to dig a hole. The depth of the hole does not need to be too deep but not too shallow either.
If it is too deep, the fermentation temperature cannot reach the ground; if it is too shallow, a large amount of undiluted manure will burn the planted vegetables.
The depth of the pit is about 30 centimeters below the planting layer and surrounds the vegetable field.
After digging the pit, Sang Yu directed the father and son to build the framework together.
She did not plan to build the square greenhouse like those in later generations, but only planned to build a triangular structure with a high middle and low sides.
Firstly, it reduces the space inside the greenhouse, making it easier for the temperature to rise.
Secondly, to reduce the stress-bearing surface, she planned to lay another layer of straw on the outside of the shed at night to keep it warm.
Seeing the framework being erected in an orderly manner, Sang Yu's brows slowly furrowed, causing Xiao Zhao behind him to be full of doubts.
She gently tugged at Sang Yu's sleeve to signal her to squat, and then reached out to smooth the wrinkles between her brows.
This action caused Sang Yu to burst out laughing: "Pfft, Xiao Zhao, do you think that my sister's frown is not pretty?"
Xiao Zhao shook her head decisively. Her elder sister was beautiful no matter what, but she didn't want to see her unhappy.
"I'm not kidding you. I'm just wondering where to get some cow dung."
What Sang Yu was worried about was not anything else but the most important part of this fermentation system - cow dung, where would it come from.
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