It's the height of summer, and mosquitoes are also active in Europe. Pen, fun, pavilion www. biquge。 info Marin is not afraid, anyway, he has rough skin and thick meat. However, little Caesar was afraid, and was bitten by mosquitoes for many bags, and Angela was so distressed that Angela burst into tears.

Ma Lin naturally remembered his previous plan to plant wormwood in the tropics and smoke mosquitoes with wormwood, so he sent someone to that wormwood field, collected a lot of wormwood leaves, dried them and put them in the master bedroom to light them to repel mosquitoes. Although the smell was not good, it finally allowed the pink little Caesar to avoid the mosquito attack.

To be honest, there are not many mosquitoes in Europe. This is mainly due to the fact that European agriculture is mainly dryland. And mosquitoes like to hide in paddy fields the most. Therefore, where rice is grown, there are often more mosquitoes than where rice is not grown.

In later generations, Marin was not very happy to go back to his hometown in the summer. Because, the mosquitoes in my hometown are too big. Probably, those mosquitoes are growing well in rice fields with plenty of fertilizer. One by one, they are all "Yao Ming" in the mosquito world, and it hurts people.

Europe has only dry land, no paddy fields, and naturally there are many fewer mosquitoes. However, the East Friesian region, with its swampy land, is just right for mosquitoes. So, there are more mosquitoes here than in other areas. But compared with the real water town area, it is still much less. Under the smoke of wormwood, these mosquitoes naturally do not make the climate.

After helping his son successfully expel the mosquito infestation, Marin put his arm around Angela and began to brag, saying that he had "eyes like a torch" and discovered how amazing wormwood is......

Unexpectedly, Angela was very faceless:

"Isn't it mosquito repellent, similar flowers and plants, we also have them in Italy."

"Huh?" Marin's ox suddenly couldn't blow it anymore, and he was a little angry. Fortunately, it's just the two of them, otherwise they would have lost face.

"In my hometown in Italy, there is a kind of chrysanthemum, which is also very powerful. Pick it down and dry it and put it in the house, which can not only repel mosquitoes, but also poison flies! ”

"Pyrethrum?" Marin reacted suddenly. Isn't it? Pyrethrum is one of the plants that is most effective at repelling flies and mosquitoes. The most important thing is that its toxicity is only for small insects such as flies and mosquitoes, but it is not toxic for large mammals such as humans.

Moreover, Marin also remembered that the high school biology teacher in his previous life also said that pyrethrum is a natural plant-based pesticide. Pyrethrum is dried, ground into powder, and then added with some water and soap to make a suspension, so that it can be sprayed directly on the crop.

This pyrethrum natural plant pesticide can effectively control aphids, leaf chan, cabbage insects, goldenrod insects and other pests and diseases, which is very beneficial to the growth of crops.

However, the effects that Marin's biology teacher talked about in his previous life did not attract farmers. Why? High cost......

Pyrethrum is a foreign gadget native to Europe, and it takes a large area of land to plant, and it is also necessary to pick chrysanthemums, dry and make powder, which is very troublesome and costly. At least, much higher than the chemical pesticides produced by factories purchased from agricultural companies. The common people are all budget-conscious, and the ghosts do that kind of thankless work. So, even if pyrethrum pesticides are environmentally friendly, what about safety? The cost is high, and everything is not negotiable......

However, Marin has now traveled back in time to the 16th century. In this era, there were no chemical pesticides. And Marlin is not a chemistry major and does not understand the configuration of chemical pesticides. In this case, plant pesticides such as pyrethrum are very useful......

Ma Lin remembers that in his previous life, a biology teacher who was an environmental activist, also said that pyrethrum, tobacco and fish vine are the world's "three major plant pesticides".

Of course, fish vines are found in the tropical and subtropical regions of East and Southeast Asia, so Marin doesn't have to think about it. Even if it is introduced, it cannot be planted locally.

And tobacco, which is still in the Americas at this time, needs to spend manpower to find it, and there is no need to think about it. However, in the future, it is possible to use a variety of tobacco, on the one hand, to make cigarettes, and on the other hand, to soak in water as a pesticide.

As for pyrethrum, this thing is native to Europe, and it can be introduced and then planted on a large scale.

It seems that mugwort leaves are lit and can only repel mosquitoes, while pyrethrum can kill mosquitoes and flies. After thinking about it, Marin still felt that it was safer to use mugwort leaves to repel mosquitoes. At least, the toxin is not as strong as pyrethrum. However, pyrethrum also needs to be planted on a large scale. It is mainly used for the allocation of pesticides and pest control.

In fact, in the past few years, after the introduction of potash and phosphate fertilizers, coupled with the use of brine selection, the yield per mu should theoretically reach more than 600 pounds.

Unfortunately, there are large and small pests and diseases every year, and in the end, the yield per mu can only reach about 400 pounds. If there are enough pesticides, the yield per mu will inevitably reach five or six hundred pounds. When the time comes, Marin's income will be increased by half......

To this end, Ma Lin specially took out 10,000 acres of land, which was intended to be used for intensive planting of pyrethrum. In addition, 10,000 acres of land were set aside for planting wormwood......

Wormwood can be used as a traditional Chinese medicine and has multiple medicinal effects. At the same time, it can also be used as a weak plant pesticide, and can also be used to repel mosquitoes.

As for pyrethrum, needless to say, it is more toxic and is cultivated to be used as a pesticide. When the time comes, there will be enough plant pesticides made from pyrethrum, and where there are diseases and pests, they will be sprayed......

After making plans, Marin called Kohler and asked him to arrange for people to go to various parts of Europe to collect pyrethrum seeds for planting on the 10,000 acres of land.

According to Angela, pyrethrum is very common in Europe and can be found in many parts of Italy. It's just that it's not very common in northern Germany.

So, Marin asked Kohler to send people to Italy to collect more pyrethrum seeds for local planting. In short, be sure to find enough seeds to plant 10,000 acres of land.

As for wormwood planting, Marin thinks there should not be enough seeds to plant 10,000 acres. Because, after successfully cultivating in a glass greenhouse before, Marin only let people plant wormwood on an area of a few acres. Even if all the seeds were collected, there would only be enough to plant hundreds of acres of land at most.

It's not a big deal, though. As long as a few more rounds of planting, there will be enough seeds to plant 10,000 acres of land......

Speaking of this pesticide, Marin remembered the earliest pesticide - Bordeaux liquid and stone sulfur mixture.

It's just that Bordeaux liquid is copper sulfate, and now that copper is so expensive, Bordeaux liquid will obviously not be cheap. Therefore, even if Marin knew about Bordeaux liquid, he would not have done it. Because, the cost is too high......

It's a stone sulfur mixture, which can be done, and Mashan can do it. Because, the stone sulfur mixture is made of quicklime and sulfur. Quicklime and sulfur are both common in Europe and are cheap, making them a good inorganic pesticide.

In addition, Marlin also remembered that the gray water of plants and trees also seems to have a certain insecticidal effect, and it is also a good potash fertilizer......

In addition, the biogas liquid after fermentation of the biogas digester is also a very high-quality fertilizer, and it also has a strong insecticidal effect......

Moreover, the biogas liquid can also be used to soak seeds, because it has strong fertility and a certain insecticidal effect at the same time, the seeds soaked by the biogas liquid not only grow well, easy to germinate, but also killed and poisoned, making the seeds more healthy and easy to grow after planting......

In fact, the seeds produced by the seed companies of later generations were soaked in a specific nutrient solution. These nutrient solutions not only have sufficient nutrients, but also kill the germs in the seeds. In this way, after the seeds are planted, they will be healthier and easier to grow. However, if ordinary grain grains are used as seeds, because they may carry some germs and nutritional problems, the growth will not be so good......

The more Ma Lin thought about it, the more excited he became, and the more he thought about it, the more excited he became, and he wrote down all the knowledge he had ignored in his previous life in a small notebook. Of course, it was Chinese characters, and even if it was stolen, no one in Europe at this time could understand it......