Hancheng's problem is phosphate fertilizer. A few people thought about it for a long time. The easiest natural Gu Yunyun to obtain is animal bones, and the Committee of Agriculture has been fertilizing the fields with the remaining fish bones and fish residue from seafood processing plants, and occasionally animal bones. But now if you want to improve the old mumu of land, where can you get so many bones?

Applying plant ash can also supplement scale fertilizer. But there is still one problem: there are not enough of them.

After a group of people pondered and meditated for a long time, Zuihou decided to call Luo Feng.

Luo Shi now works in the Social Department of the Political Security Agency every day to make black materials, and his life is very fulfilling, but he still continues to act as a living dictionary every day after work.

Wu Nanhai's question is: how to make phosphate fertilizer without phosphate rock?

"It's easy." Luo Feng said. "Boiled plant ash"

"I know that, and I know the animal bones. However, I am going to fertilize the land that is severely deficient in phosphorus. ”

"Let's ask the metallurgical department for steel slag." Luo Shi said, "I remember they used a small converter, right? Just suitable. He went on to say: "Steel slag mixed with stone curtain can obtain a kind of soil phosphate fertilizer."

The slag making process in converter steelmaking is to produce acid slag from sand to replace phosphorus in pig iron. So converter slag contains quite a lot of phosphorus.

"Okay." Wu Nanhai hurriedly called the Ministry of Metallurgy.

Ji Wusheng told him that most of the steel slag accumulated after steelmaking had been used as paving materials, and there were only a few tons of stock in the steel plant.

"A few tons is enough." Fa Shilu said. "Let's make do with it. If it is not enough, a large amount of plant ash will be used, and the students of the national school will be asked to start a campaign to recycle the plant ash. Then put a lot of mud on it

"I don't know if the Foreign Trade Commission later dealt with Nanbao's side?"

Nanbao's coal mines, the brown butterflies and peat produced are the main sources of fertilizer in Lingao in modern time and space. Naturally, the traverser will not let go. However, Nanbao is already close to the Li district. And it is a hilly area, and the long-distance exploration team has been to it several times, thinking that their mining investment is too large, and the distance is also far away, which is almost equal to the opening base. It is better to let the locals mine and then buy the requisitioned model.

But so far, this has not been done. The locals have little interest in mining this black coal, and even if the Crossing Group is willing to buy it, no one is willing to mine and transport it.

After Wu Nanhai reported the need for lignite as fertilizer to the Executive Committee, Gao De decided to collect it without further ado, and simply used compulsory apportionment to collect it. So they sent people to call the liaison officers of all the villages near Nanbao, and gave them the task of mining and transporting a certain number of "big catties" of lignite to 100 taels in each village in return, and their grain dues could be compensated at a discount of lignite and peat.

"Thank you so much." Wu Nanhai was almost confused, "In fact, it's better to have phosphate rock"

"I don't have anywhere to look for that." Dude said helplessly, "There is no such thing in the local area." ”

"Why don't you sail to Yulin Port to mine?" Wu Nanhai said. He saw in the report that phosphate rock was found near Tiandu.

Ma Qianzhuo shook his head: "The phosphate rock over there in Yulin is not on the seaside, so you have to go more than ten kilometers inland." There are no roads. Without equipment, it won't be shipped back in a month. ”

"That's it." Wu Nanhai looked disappointed, "Can you think of a way to send a small-scale mining team to mine a dozen tons first?" ”

"This." Ma Qianzhuo thought about it, and it was not only the Committee of Agriculture that needed phosphorus, but also the Ministry of Chemical Industry and the weapons team had put forward proposals with him to discuss ores. We have to wait patiently for half a year to develop Tiandu. Otherwise, it's good to say, the food problem is not easy to mix.

"I asked the Ministry of Resources if there was a quick and economical way to do it." Ma Qianzhuo shook the phone on the table:

"Switchboard, I'm the Planning Commission, and I'm in charge of the first ugly office."

"The quickest solution is to go to Dongsha Island and collect struvite stones." The remote exploration team answered the phone by their secretary, Zhao Xue, "Judging from the resource map, this place is not far from Dongsha, and the strantio on the island is piled up, and it is easy to mine it in the open pit." It was enough to bring a boat back. ”

"It would be better if there were struvite stones." Wu Nanhai said. Struvite is not only rich in phosphorus, but also contains nitrogen and potassium, which is a natural compound fertilizer. Even potash fertilizer is saved.

"Okay, let's send the navy." Ma Qianzhu immediately made a decision, "Please ask People's Commissar Chen Haiyang of the Navy to come." Let's jihua a ship that has been dispatched. ”

Wu Nanhai was simply flattered, this efficiency, this kind of courage, more than anything else, "discuss and discuss." "Discuss and discuss" feels much better.

At the moment, it was decided that the Zhenhai would set off to dig guano and that it would take more than ten days to send a sailboat, and it would be much more convenient for the hybrid boat. After all, sailing in the wind, taking a jishu job, crossing the crowd, only the North American Qian brothers, those few people are relatively sophisticated, and they have played with small sails.

The Zhenhai, commanded by Lin Chuanqing, quickly found Dongsha Island according to the route map.

The island is about 10,000 kilometers wide, the terrain is very flat, there are no peaks, and "there are many coconut trees." A large number of seabirds constantly taught to take off and land over the island, and the masts of Zhenhai flew up and down. From time to time, he also left some "gifts" for the sailors on deck.

"Hell!" Lin Chuanqing scolded and spat at the mouth. Xie's hat has been baptized, and Wang Min is somewhat superstitious. I'm obsessed with this thing.

"There are so many birds, there must be a lot of struvite stones.

Bai Guoshi, who was full of interest, said.

"To hell with your struvite stones." Lin Chuanqing put on a straw hat for himself, "How can I do such a task!" ”

Lin Chuanqing, who has been smuggling snakeheads for many years, knows where it is without a navigation chart, but he has never been close to this place in the past, and there are Taiwanese marines on it, and it is very troublesome to come to check what, in case the temper is not good, thinking that you are engaged in espionage and rewarding you with a string of bullets, it will be even more unappetizing.

"The water is deep and the meter is rotten, and the distance is Xuan!" The sailor reported loudly.

"Slow down, lower the dinghy. Water Measurement! Lin Chuanqing commanded. So the sailors disembarked the boat and rowed towards the island.

Bai Guoshi said: "There is a lagoon on Dongsha Island, can't you just drive the boat into it?" ”

"It's too shallow." Lin Chuanqing shook his fork, although he did not go to Dongsha Island, but he heard that the lagoon of Dongsha Island is very shallow, "less than a meter at low tide." It's shallow when you go in. ”

The entire Dongsha Island is crescent-shaped. With an area of about one square kilometer, there is a lagoon on the west side of the island. The depth of this lagoon is less than a metre at low tide and the width of the outlet is not more than a metre. It has almost no value as a cobalt land on a coral island. Because of the exchange of water caused by the opening pole of the lagoon, the long-term accumulation of organic detritus at the bottom of the lake is very large; Overall, it resembles a swamp ecosystem along the coast, but is completely different from the clear, coral-filled lagoons found on the usual coral islands. A few travelers who wanted to enjoy the scenery of the tropical coral island were disappointed.

The vessel is under the guidance of a water measuring vessel. Skirt the west side of the island. Dongsha Island is actually the only one in a chain of atolls that is exposed to the water. The entire Dongbi Atoll is about a kilometer in diameter, and ships can sail into this lagoon to anchor. However, due to the lack of coral reef dams outcropping to resist it, its value as a harbor shelter is limited.

"Downtime! Under Cobalt! Lin Chuanqing steered the boat as close to the island shore as possible, and did not release the cobalt until the front keel was almost wiped to the bottom.

"Assemble the pontoon!" Lin Chuanqing continued to give orders.

Struvite mining requires heavy loads, and there is no lagoon on Dongsha Island where large boats can moor, making it too inefficient to travel by small boats. So there was a set of floating remnant bridges on the sea of Zhenhai. Prepare to improvise between the beach and the boat.

"Is there anyone on the island? Do you want to tell everyone to bring weapons? Bai Guoshi asked Lin Chuanqing. He put his pistol in a waterproof holster.

"There shouldn't be summer, it's not the fishing season, and Wang Min won't come here. But there are a lot of sharks here. Lin Chuanqing said and raised a horn and roared: "Everyone should be careful, there are a lot of sharks in the sea!" Don't fall overboard. If you get hurt, go back to the big boat right away, and don't pee in the sea! Don't panic if you see sharks."

The lagoon of Dongsha Island itself is rich in organic detritus at the bottom, and when the lake water flows out into the nearby sea, it becomes a food inducement, attracting sharks and other predatory creatures to follow the current to the vicinity of the lagoon. So the density of sharks here is particularly high. In addition to sharks, the soap lagoon is also home to a number of ferocious predatory fish that are not to be underestimated.

Two more dinghys were lowered, and the sailors untied the pontoon from the hull. Start connecting with chains. Lin Chuanqing took care of the sailors on the ship and kept watch on both sides of the ship. Each dinghy is also equipped with a special shark guard, who carries a harpoon and wears chain armmail and gloves made of thin iron rings on his arms.

There are a lot of sharks in the lagoon. And there are many kinds, and in the clear waters, you can clearly see these sea lords swimming around happily. Everyone was nervous. The action was deformed when it was tense, and the floating trestle took twice as long to build as usual. The nearly 100-meter-long pontoon bridge undulates on the surface of the sea, and shark fins can be seen from time to time around the water, and the faces of the first people who land through the pontoon bridge are white. Originally, I planned to go to the island to see it, and several of them simply didn't go up.

Because Bai Guoshi was responsible for guiding the mining of struvite stones, he had to get off the boat, hold his breath, and walk across the pontoon bridge with trepidation, and came to the island. It was the same as the general situation of Dongsha Island that he had learned about in geography.

The island is slightly higher in the northeast. The southwest is slightly lower, the center is low-lying, and the average elevation is about five or six meters above sea level. The highest is about ten meters high in the northeast. The whole island is in the form of high and low in the middle. The central lowlands are shallow lagoons, about one-third of the island, and the mouth of the lake opens to the west.

[зZcｎ.]