Su Jinli looked at Chu Yan with a smile: "The matter of fertilizer, the prince doesn't need to worry, I have already asked people to prepare, but it will take some time." ”

The kinds of soil fertilizers she knows are quite easy to make.

The only problem is the raw material.

The ancients have long known the role of fertilizer, and they also attach great importance to the aspect of making fertilizer, so they will open their minds and come up with various methods to make fertilizer.

Although some of the methods are a little strange, it can also be seen how much they value fertilizer.

Therefore, the collection of raw materials is a bit troublesome.

Because it's not just them who need to make fertilizer, but others need it.

For example, in the farmland they went to before, in order to maximize the use of fertilizer, the stewards used all the fertilizer in the upper and medium fields, and were unwilling to divide more fertilizer and fertilize the inferior fields.

Other farms are also making fertilizer.

Now it's spring ploughing again, and no one wants to give up their own fertilizer.

Su Jinli borrowed someone from Su Xin, and it took a lot of effort to collect some raw materials and make the first batch of fertilizer according to the recipe given by Su Jinli.

If you want more ingredients, you have to spend more time collecting them.

However, Su Jinli was not too worried.

Chu Yan raised a lot of cattle in his farmland, and there were so many tenants, and the raw materials were all ready-made.

As long as the effect of the first batch of fertilizer comes out, there is no need for Su Jinli to say more, those stewards and tenants will also beg her for more fertilizer, and even make fertilizer according to the recipe she provided.

Those recipes, she didn't plan to hide them.

The main reason is that the yield per mu in this era is too low, and if you want to increase the grain output of the whole country, those fertilizer recipes cannot be kept privately.

Moreover, the raw materials used in these soil fertilizers are also simple, as long as the recipe is published, the villagers can make it themselves.

However, Su Jinli does not plan to directly announce the formula of soil fertilizer.

She plans to let people experiment with more scientific fertilization methods first, and then publish them together with the formula.

In this way, the effect will be the best.

When Chu Yan heard Su Jinli's words, she knew that she already had a plan in her heart.

So he hesitated and didn't continue to ask.

Anyway, Su Jinli had already taken over those inferior fields, and he had already arranged for people to go in.

Every day, someone would report to him about Zhuangtian's situation.

As long as Su Jinli asked people to fertilize, he would soon know.

I just don't know what the effect of the fertilizer Su Jinli mentioned before is.

Chu Yan thought about it for a while, then pressed it down again, and thought of another, more important thing.

He coughed lightly and said, "Actually, this king came back on purpose because he wanted to tell you something serious. ”

That's right, he came back for business, not because of that kind of crazy person!

Chu Yan secretly snorted coldly in his heart, and seeing that Su Jinli didn't seem to be interested, he continued: "Bao'er, do you remember those cements? ”

When Su Jinli heard this, she really fell into her heart.

She looked at Chu Yan: "So the prince came back this time to talk about cement?" ”

"That's right." Chu Yan couldn't help but puff up his chest, looking more plump and handsome, "Father thinks that the effect of cement is very good, and he has arranged for craftsmen to go to the border to build a cement kiln and burn cement to repair the city wall. ”

Chu Yan paused when he said this, and saw that Su Jinli had been looking at him before continuing, "At this time, the border gates should have begun to repair the city wall. As long as it is repaired, when the barbarians knock again, they will definitely be able to suffer a big loss! ”

What he didn't say was that this winter was extremely cold, and it had been snowing heavily outside the gate, and I don't know how many cattle and sheep had frozen to death.

The barbarians had nothing to eat, and because of the heavy snow, they couldn't go south to plunder.

Now that the weather is getting warmer and the snow is beginning to melt, I am afraid that it will not be long before the barbarians, who have been suffering from hunger and cold, will go south and knock to the border.

When the time comes, I'm afraid it will be another fierce battle.

Although they are not afraid, once they fight, there will be a lot of casualties.

If they could dare to repair the city wall before the barbarians knocked, they would be able to minimize the damage and even teach the barbarians a hard lesson!

He thought that Su Jinli was still a woman after all, so he didn't plan to tell her about these dead people in the war.

But he didn't say it, Su Jinli still guessed it.

As soon as she thought of the casualties and economic losses caused by the war, she couldn't help but ask, "The barbarians went south to knock on the border, mainly because they had no food, grass and food. In that case, why not open a mutual market at the border gates? ”

Chu Yan shook his head: "You think too simply, those barbarians are fierce and greedy, and they like to plunder. Even if the mutual market is opened, they will loot if they are slightly dissatisfied, and may even collude with those profiteers to smuggle copper and iron. How can you cheapen them? ”

As soon as Su Jinli heard it, he knew that Chu Yan was very dissatisfied with those barbarians.

However, this is also understandable, Chu Yan has always grown up in the north, and often saw the barbarians knocking south to raid, so naturally he did not have a good impression of those barbarians.

However, she still felt that the losses in the war were too great to outweigh the losses.

The population of the Tianlong Dynasty is only fifty or sixty million, which can be said to be vast and sparsely populated.

So a lot of the land is barren and no one cultivates it at all.

Once there is a war, there will be countless casualties.

With today's medical treatment, the number of casualties in war must be terrible.

Many people were not killed on the battlefield, but because of an infected wound, and finally died of pain.

Once the population is lost, how can we still carry out development?

She can't do much now, but if she can avoid unnecessary wars, why not?

So she thought about it for a while, and then said: "If you are worried that those barbarians will privately collude with the profiteers in the customs to smuggle copper and iron, why not set up a foreign trade department to be responsible for foreign trade affairs?" ”

Chu Yan was stunned when he heard this: "Foreign Trade Division? ”

Su Jinli nodded: "I think that a foreign trade department can be set up, and if a businessman wants to do business with foreigners, he must first register with the foreign trade department." If it is not registered, it will be regarded as smuggling, and if it is caught, it will be severely punished.

In addition, when trading with foreign countries, you can also directly contact the Foreign Trade Department to see how many goods they need and negotiate the order.

Then the orders will be distributed to those registered merchants, so that they can prepare the goods, and after being inspected by the Foreign Trade Department, they will be handed over to foreigners, and the money will be paid in one hand and delivered in the other. ”

When Chu Yan heard this, he couldn't help but fall into deep thought.

In the past, the imperial court also set up a mutual market, but it seems that no one has ever done this method proposed by Su Jinli.

In the past, the mutual market was more like a bazaar for merchants and foreigners, allowing them to trade freely in this bazaar.

Now this approach ...... In fact, all orders are unified and traded by the Foreign Trade Department, rather than merchants directly trading with foreigners.

Sounds like a good deal?