The weather is getting hotter, and it hasn't been long since the sun has risen, and people who are already hot want to sweat.

Fortunately, ice has begun to be made in the palace, and because ice cubes can be made at any time, there is no shortage of them, so they are distributed to each palace every day.

There are more ice basins, and the inside of the palace is really cool.

"Your Majesty, there are too many ice basins in this hall, which is not good for your body." Wei Renshi stood in the hall for a while, feeling a little cold, so he reminded.

Li Shi was looking at a pile of music at the desk, and when he heard Wei Renshi say this, he didn't look up, but said, "It's too hot this year." In previous years, it would have been another month to get so hot. It seems that this year is also God's help to the Tang Dynasty, so as to teach those Zhancheng rice to ripen earlier. ”

What Li Shi has in his hand is the music played from the pilot projects of various Champa rice.

As the weather gets hotter, the Champa rice in each trial county has begun to mature closely, and the yield per mu can be roughly estimated.

These estimates, as well as the growth of Champa rice, were passed on to Li Shi through these notes.

"The Champa rice in Lingnan has been harvested for two seasons, and the yield is the same as Wei Qing said." Li Shi was very happy, put down the music in his hand, and smiled at Wei Renshi: "In this way, the harvest of this half year alone will be more than the harvest of the side in a year!" And in Yazhou and other places, it is estimated that it can be planted for two seasons, so calculated, isn't it planting Zhancheng rice there, and it can be planted in other places for two years a year? ! In just a few pilot projects in Lingnan, after these two seasons, the grain obtained is almost close to the annual output of a Shangzhou in Guanzhong. ”

"In the past few days, the minister has also thought of some ways to increase the planting area of multi-season Zhancheng rice." Wei Renshi listened, so he said.

"Oh?" Li Shi's eyes lit up and asked, "What did Wei Qing think of?" ”

"Develop Lingnan." Wei Renshi said: "There are still large tracts of wasteland in Lingnan, and these wastelands have been developed for the cultivation of Champa rice. ”

"Develop Lingnan?" Li Shi repeated, and said: "Lingnan can indeed be planted for multiple seasons, but most of the wasteland in Lingnan cannot grow crops, so what is the use of development." Moreover, there are many miasma in the Lingnan forest, and people will get sick if they encounter it mildly, and if they die if they are serious, how can they develop the land of Lingnan? ”

In fact, Wei Renshi had already thought about it before.

The conquest and occupation of the Ring Kingdom is not to be thought about until the Sixteen Guards, at least the Jin Wuwei, completely regain their establishment and combat effectiveness.

However, in the territory of Datang, the only place where Champa rice can be planted for multiple seasons is Lingnan.

At the same time, there are many limestones in Weinan, and limestone is the main raw material for firing cement, so Wei Renshi sent people to look for several other places near Weinan, such as Jingyang, which are also rich in limestone resources.

In addition to being used to burn cement, one of the other uses of limestone is that it can be used to make mature lime to improve acidic soil.

After only giving up the plan to temporarily abandon the Ring Kingdom, Wei Renshi connected the two.

Gangnam Province and Yeongnam Province are the main areas of acidic soils, and this area has a large amount of undeveloped land and can be cultivated in multiple seasons.

If the Imperial Court could develop Gangnam Province and Yeongnam Province on a large scale, then the area where these acidic soils were located would be developed.

Once developed, hydrated lime can come in handy.

Although there is not much hydrated lime needed to improve the acidic soil, and it only needs 10 to 40 kilograms per mu per year, it is not enough to withstand the large area of acidic soil in Gangnam Province and Lingnan Province!

If these places are developed, the soil will be improved and Champa rice will be planted. With such a large area, even if the yield is not high, it is worth a Linyi country!

And to improve so much acidic land, there will be no shortage of slaked lime needed!

In this way, Wei Renshi could mine limestone to make slaked lime for sale, and the imperial court could obtain fields that could grow Champa rice for many seasons and obtain more grain.

Win-win!

"Your Majesty, if Weichen contributes to the imperial court to overcome the miasma in the forest, is there a way to improve the fields in Lingnan?" Wei Ren bowed and said.

In fact, the development of Lingnan has been backward in ancient times, and miasma is a major reason.

The so-called miasma is the poisonous gas generated after the decay of animals and plants in the tropical primeval forest, the miasma in traditional Chinese medicine, the toxic gas that can cause human diseases in the damp heat and evaporation in the mountain forest, the main reason is that no one effectively disposes of the dead carcasses of animals, and the tropical temperature is too high, which creates favorable conditions for the production of miasma.

In fact, because ancient people had very limited knowledge of miasma, they did not know the real situation. In fact, most of the miasma that causes disease is caused by mosquito swarms. A large number of mosquitoes with falciparum malaria bacteria gathered together to fly, and from a distance it looked like a black and dreary gas. Humans and animals are infected with falciparum malaria when they are bitten by them. This is why some people who have been to Lingnan will say that after seeing the smoke miasma in the forest, people will fall, in fact, the miasma is caused by mosquito swarms, and these mosquitoes can transmit falciparum malaria, causing people to get sick and even die. Historically, it was not until the emergence of microscopes in the West that a large number of microbial viruses were found in the bodies of patients who had been invaded by "miasma", and the invisible "miasma" disappeared from infectious diseases and was replaced by pathogenic microorganisms that could be visually verified by scientists.

In later life, Wei Renshi studied Chinese in the university, and there was a folklore in it, and he had followed his mentor to the primeval forests in the south, and he needed to inject a lot of vaccines in advance.

Wei Renshi asked at the time how he could avoid being infected with malaria if he did not have a vaccine.

I still remember that there are some things that cannot be cured, but can be prevented. One is coix seed, after a long time, it can be lightened to remove miasma, and there is also betel nut, which can also win miasma, and the rest such as, wormwood, realgar, atractylodes and the like, often used to burn and smoke, can also remove miasma. There is also Artemisia skun, also known as Artemisia annua, which can also disperse those mosquitoes and treat malaria.

Wei Renshi told Li Shi these methods, and Li Shi was greatly surprised when he heard it.

"Oh? Wei Qing said......" Li Shi asked.

"Your Majesty can send someone to verify it according to Weichen's method, to see if it can really improve the sour soil in Lingnan Province and Jiangnan Province, and see if it can overcome the miasma in the forest." Wei Renshi knew what Li Shi meant, so he said.

Li Shi thought for a while and said, "Okay!" I sent this edict to the locals and asked them to try this method. If it succeeds, Wei Qing should be remembered again! ”

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