Jiang Feng was carefully calculating, but he quickly crossed out 500 catties of salt again, the reason for the slow efficiency in the early stage was because of the construction of the salt pan in the early stage, which slowed down the overall efficiency, if you simply consider the efficiency after the completion of the salt pan, Jiang Feng quickly recalculated a number, the average daily salt rate of a person is about 750 catties.

According to this efficiency calculation, it is not difficult to increase the annual output of 120,000 stone by increasing the number of manpower, because in winter, the salt yield will definitely drop to a very low number, so the production must be increased in summer and autumn, but I don't know this salt lake...... Can it sustain such development?

Of course, Jiang Feng didn't know that even if the entire salt lake was supplied to the entire Datang people for more than a thousand years, it would be no problem, and of course, Datang could not rely on this one salt lake alone to replenish it.

In fact, there are many salt lakes in Qinghai, but unfortunately you can eat it directly by drying salt, that is, a tea card, like the Zarkhan Salt Lake in later generations, which is bigger than the Chaka, but the Zarkhan Salt Lake is famous for its potassium salt, which is an important source of fertilizer and industrial salt, not edible salt.

Jiang Feng now has to consider not only the problem of salt brine, he is also thinking about how to improve the salt brine, filter out the impurities in it, and be able to produce better quality salt.

During this time, Jiang Feng took a lot of words from these working Tuyuhun nobles, for example, the salt of the Chihai here was actually known by the Tuyuhun nobles all along, but they blocked the news, in some places in the Chihai, only the salt cover on top was uncovered, and the salt dug out from below had no impurities.

Moreover, Jiang Feng also heard that the salt here was sold to the Central Plains during the Han Dynasty, but it was gradually cut off later.

Jiang Feng knows the salt cap in these people's mouths, because the salt cap contains impurities, so it is not as pure as the salt below.

The question is, why is it that the salt cap formed by the continuous solidification of the water of the salt lake has more impurities on the top and purer salt below? What's the truth in that? If you make this clear, is it what His Highness said can filter impurities? How do you simulate this environment?

And why is it that the salt obtained according to the method given by His Highness does not have as many impurities as in the naturally condensed salt caps?

Jiang Feng, who was originally calculating efficiency, involuntarily fell into thinking again.

When Jiang Feng was thinking about it, the hammer was also entangled, he first exchanged five catties of black noodles, which is a rough noodle directly processed from wheat, without removing the bran, such a face was a luxury for them before, and they couldn't eat it once during the New Year.

And now he can exchange 5 pounds for a day's work! That's enough food for their family for a day! If you add his eldest son's, it means that they save a day's rations for every day they work! Isn't it possible to save a year's worth of food in a year?! Then they will be able to kill a sheep in the New Year!

And in the grain store, the hammer actually saw the snow-white white flour! White flour without bran! 2 catties of food stamps can be exchanged for 1 catty!

And salt! There is salt in the Red Sea, and the hammer knows it, but that's not something they can touch, it used to be a nobleman's! But now His Highness has spent a lot of effort to make these salts, but with only 5 catties of grain, they can exchange them for half a catty!

What a gift!

What's more, after the hammer came here, they found out that His Highness was open to them for more than just salt and grain! They can also exchange fish, and the fish is also very cheap, a pound of food stamps can be exchanged for a pound of fish!

What's more, in the third shop, Hammer can barely believe his eyes! Iron! That's right! His Highness is willing to let them exchange for iron!

When he saw the iron tools, Iron Hammer was stunned, because Datang embargoed iron tools from these countries, and Iron Hammer knew about it! In the herdsmen's place, a knife can be used as a family heirloom! And the arrows they use for hunting are almost all wooden! The Hammer family had a knife, which had been handed down from his grandfather's time!

But after so many years, the knife has become smaller and smaller!

And now, His Highness actually let them exchange food stamps! Iron Hammer went to see the exchange price of ironware, which is also calculated according to weight, if you exchange ironware, 1 catty of pig iron can be exchanged for 50 catties of food stamps!

Iron Hammer was moved to tears, a kitchen knife, the price of His Highness here is 70 catties of food stamps, which means that he can exchange a kitchen knife for more than two months! This is something that was unimaginable before! In the past, let alone work for two months, he worked for the nobles for a year, and the nobles would not give him an iron kitchen knife!

For three generations, the only thing they had in their family was an iron dagger, and now it was almost worn out like a knife.

Iron Hammer couldn't help but think, it is said that the cost of iron smelting is very high, can Your Highness afford to lose it! Give them such a low price.

Lu Hai is also calculating this problem, a blast furnace needs about 80 people to maintain, of which only 20 people are needed to operate the blast furnace in two shifts, and the remaining 60 people are used to dig iron ore, coal mines, and transport the consumption of iron ore mines.

The work of about 80 people can supply a blast furnace, and the main thing they mine is the rich iron ore in the information given by His Highness, about 1.8 stone of iron ore to produce 1 stone of pig iron.

In fact, manpower is mainly consumed in transportation, coal mines, iron mines, limestone mines, and copper mines have been selected as far as possible from the information given by His Highness.

Lu Hai was considering whether to prioritize the construction of concrete roads between these mines first, so that they would be faster and require less manpower.

Now the number of iron in one furnace is also increasing, an average of 3 furnaces of iron per day, about 100 catties of iron per person per day, a person can work for 10 days to exchange 1 catty of pig iron, about 999 times the profit.

However, this profit is also on the Xizhou side, and if it is transported to Chang'an or other places, this profit will definitely be reduced.

Lu Hai was a little entangled in his heart, how to help His Highness increase profits, I heard that His Royal Highness was going to prepare a dowry for His Royal Highness Changle, the eldest grandson's family seemed to be quite rich, and he didn't know if he could make so much money in a year, and he couldn't let His Highness lose no matter what!

Oops, no! Lu Hai suddenly knocked on his head, it's so stupid! It's stupid! Your Highness's teachings are all lost in your mind! Why should I calculate the cost of shipping?! I will transport the pig iron from here to these places in Longyou Road, and according to His Highness's price, I will add transportation fees to the big buyers?! It costs 5 yuan to transport a catty, and I add 10 yuan!

It's so far away, it's reasonable that iron is more expensive! What's more, even if I add the transportation fee, it is much cheaper than their own refining!

According to His Highness's teachings, this is called a seller's market! Yes, the shipping fee must be added! Anyway, the large-scale purchases are all gate valve families for the time being, and they are not short of money.

As for the ordinary people, they only buy one or two pieces, and according to His Highness's pricing, the freight is subsidized to the people! When the time comes, they must be told so that these people can know that His Highness has lost the transportation fee, so that he can sell iron tools at a low price for them, so that they can use good iron tools! That's it!

By the way, when these herdsmen exchange ironware, they also have to tell them that the ironware purchased by the people of Chang'an City is slightly more expensive than them, and in Xizhou, His Royal Highness is sympathetic to them!