Chapter 81 Leftovers From Fish Killing
When it comes to potash fertilizer, as a rural child, Marin naturally thought of phosphate fertilizer. Crops are generally fertilized with nitrogen, phosphorus, and potassium.
The ancient Chinese people applied manure, which was actually nitrogen fertilizer. Because manure contains nitrogen. However, nitrogen fertilizer alone is not enough. Europeans do not fertilize, so the yield of wheat per mu is only 100 catties. The Chinese people apply manure, and the yield per mu can reach more than 200 catties.
Later, in addition to applying manure, the Chinese people also sprinkled plant ash on the ground. Plant ash contains potassium, which is barely a weakened potash fertilizer. Applying these two kinds of natural fertilizers, the wheat yield of Huaxia people can reach about 300 catties per mu.
In the paddy fields in the south of the Yangtze River, because of the vertical and horizontal ditches, there are many fish and shrimps in them. These fish and shrimp are rich in phosphorus in their bodies. Phosphorus seeps into the ground after fish and shrimp die. Its effect is equivalent to the phosphate fertilizer of later generations.
Therefore, some paddy fields in the south of the Yangtze River that have been applied with manure and plant ash, and are rich in phosphorus, can produce up to five or six hundred catties per mu. Because, in this field, the three elements of nitrogen, phosphorus and potassium are complete...
Of course, the ancients did not understand the principle of fertilizer, and did not know that dead fish and shrimp could also fertilize fields. Therefore, it has been said that the land in the south of the Yangtze River is fertile and the land in the north is barren. Actually, that's not the case at all.
The actual situation of later generations has proved that as long as three kinds of chemical fertilizers are applied, the fields in the north and the south are as high-yield.
On Texel, Marin promoted manure as well as grass ash. However, the vegetation resources on Texel Island are not as abundant as inland. The potassium content of plant ash is very limited, so Marin sent people to the Harz Mountains to purchase bitter salt mines (potash mines) and directly use potassium salts as potash fertilizers.
However, this phosphate fertilizer is very difficult to obtain. Because Morocco, which is rich in phosphate fertilizer, can't afford to mess with Marin. Even Western Sahara, another phosphate-rich place, is within Moroccan control.
Marin had read time travel novels before, and knew that near Laayoune in Western Sahara, there was an extra-large phosphate mine with reserves of up to 2 billion tons, not far from the sea.
However, it is now Moroccan territory. Morocco is not too strong, but definitely not weak either. There is no problem with pulling out 10,000 or 20,000 Arab cavalry. Therefore, if you want to seize the phosphate mines in Western Sahara, you have to ask the Moroccans' machete first.
As for trading with Moroccans, buying phosphate rock can be done after more than 100 years, but absolutely not now...
Because, after the 17th century, the Holy See declined and its authority was no longer there, and everyone could trade with pagans, no problem. But now is the end of the 15th century, the authority of the Holy See is still very strong.
If it is a big country like Spain and Portugal, it may not be necessary to give face to the Holy See. As for the island of Texel in Marin, he dared not give face to the Holy See. Trading with pagans, and also the Greens, the nemesis of Christians, could easily be declared heretical by the Holy See.
The Holy See itself may have average combat effectiveness, but now the Holy See has a very strong appeal. If he is on the blacklist of the Holy See, Marin will wait to be beaten by the group...
Therefore, before the European Reformation and Religious Wars, Marin never dared to fight against the Holy See. And defeating Morocco is currently unlikely. Therefore, regarding the phosphate fertilizer issue, Marin must think otherwise...
I remember when I was studying chemistry in middle school, Marin listened to the middle school chemistry teacher who said that the bones and scales of fish are rich in phosphorus. Even in fish meat and fish viscera, phosphorus content is good.
"In other words, fish bones, fish scales, and fish internal organs can also be used as low-level phosphate fertilizers?" Ma Lin thought while sitting at the table.
Thinking of this, Marin brought a few attendants and rode to the two fishing ports of Thoruncher and Odeshilde to conduct on-the-spot research.
Sure enough, every time the fishing boats returned to the port, after a large number of sea fish were unloaded, the fishermen began to kill the fish one after another...
A large number of fish scales were hung and thrown on the ground at will. Large quantities of fish guts were discarded and even thrown into the sea…
And after every meal, many fishermen's homes,
There are also a lot of fish bones left over from eating, which are treated as garbage and discarded at will...
"Damn it! What a waste!" Marin who was on the inspection couldn't help feeling distressed.
"Master, what's the matter?" asked Ban Sauer.
"These... are all good phosphate fertilizers! Just throw them away!"
"Phosphate fertilizer? What is it?" Sauer was full of question marks.
"You don't know..." Marin shook his head.
The next day, Marin issued an order, ordering all the fishermen in the two major fishing ports to kill the leftovers of the fish (except for the highly toxic gallbladder) and the remaining fish bones after eating the fish. To collect and submit. Anyone who throws it privately will be fined...
These collected fish scraps, such as fish scales, fish internal organs, and fish bones, Marin planned to organize people to dry them in the sun, and then smash them into natural green fertilizers similar to plant ash. Or, throw it directly into the manure pit, and ferment the compost with manure and plant ash.
Although, the phosphorus content of this fish-killing waste is far less than that of phosphorus fertilizers. However, a plant ash-like effect can also be provided.
Moreover, because of Marin's strong support, there are now more than 20 large fishing boats with a displacement of 100 tons in the two fishing ports of Thoruncher and Odesilde. Every day, the two fishing ports handle dozens of tons of fish scraps alone.
The phosphorus content of these scraps is about one percent. Although it can't keep up with the special phosphate fertilizer, but the dosage is large, it can still be used as a phosphate fertilizer.
Manure (nitrogen fertilizer), potash fertilizer (potash) and phosphate fertilizer (fish leftovers) have been fully applied, not to mention reaching the level of kilograms per mu in later generations, at least similar to that of the top paddy fields in the south of the Yangtze River in the Ming Dynasty, reaching five Six hundred catties per acre...
That is to say, the fish-killing scraps that were discarded by the fishermen as garbage, Marin intends to use it as the most primitive and natural phosphate fertilizer...
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