Spring has arrived, and the wheat planted by Jim has begun to turn green, and now Jim is also starting to get busy, at this time, there is a lot of farm work to do, first of all, loosening the soil, which is an important measure to promote the early return of wheat seedlings to green and healthy growth. Because of the loosening of the topsoil, the aeration conditions of the soil are improved, which can increase the soil temperature and promote the development of the root system. Because the capillary tube is cut, the moisture of the underlying soil can be prevented, and it plays a role in retaining moisture. And it's not something that can be done all at once. The number of hoeing pines, generally from the return to the green to the jointing of a total of 2-3 times, the depth of pines should be shallow first and then deepened one by one. So, in the era when there was no mechanization, it was really hard to take care of a large field of wheat.

This year's wheat is not growing well, so top dressing is extremely important. It's just that now the "soil gold" has not been delivered, so the top dressing has to wait a little longer. This made Jim a little worried. Fortunately, I was still prepared, and I still worked hard to compost myself years ago.

With the handle of the hoe in his hand, Jim straightened up, he had been busy all morning, and needed to go back to eat and rest. Jim walked to the wheat field, sat down on a rock, picked up the kettle he had placed there, took a sip of water, took out the bread that his wife had prepared for herself, nibbled on it, and then looked habitually into the distance. At this time, a small black dot appeared in his field of vision.

The little black dot was getting bigger and bigger, and Jim could finally see clearly, it was a freight wagon, slowly moving along the road towards Jim. The last one was in front of Jim, and then stopped.

"Hey, Jim!" Romney, who was driving the carriage, shouted at Jim, "There's something for you." Well, your earth gold! ”

"Really?" Jim asked, standing up.

"Well, it's in my car." Romney said, "Get in the car, go to your house and unload the cargo first, well, and the instructions for use, you can read it yourself." ”

……

"Petrov, go get another batch of rabbits. Real yàn to use! In the chemical area of the Dashi yàn room, Dr. Harry, who was in charge of the development of the insecticide, shouted to his assistant, "Also, these rabbits are dragged out and disposed of." ”

Harry is now in charge of the final tests of an epoch-making insecticide. This test is mainly to test the toxicity of this drug in warm-blooded animals. At the beginning of this study, Scrooge had this to say to the staff: "In this world, the scientist who needs the most conscience is the chemist, and among the chemists, the chemist who needs the conscience most is the chemist who studies pesticides." Because a chemist, especially a chemist who studies toxic substances, if he does not have a conscience, can easily make something dangerous to the public. In this world, the most cautious scientist is also a chemist, and among chemists, the most cautious is the chemist who develops pesticides. Because they are dealing with all kinds of toxic things, if they are not careful enough and do not do it well, it is likely that unintentional mistakes will bring irreparable losses to others. For an insecticide that is ready to be widely used in agricultural fields, the most important performance is not the efficiency of the insecticide, but the safety. If we only think about poisoning bugs, then it is not very difficult for us, well, for chemists who study toxic substances, it is not particularly difficult to poison an elephant or even a blue whale. But what we need is not a poison that can poison a single creature, but an insecticide that can effectively kill pests, but is relatively safe for warm-blooded animals. ”

In the real yàn, the real yàn group did get a lot of poisons with very high efficiency. For example, two months ago, they trial-produced the No. 35 test sample, at that time they were under the guidance of Scrooge, well, as a chemist, although Scrooge is usually very busy with business, he still often finds time out of hobby to run to the real yàn room and make real yàn together. At that time, they reacted phosphorus methoxydichloride with hydrogen fluoride to obtain phosphorus methyloxydifluoride, and then reacted with phosphorus methyloxydichloride and isopropanol to get isopropyl methoxyphosphonate (in our time and space, this thing has a simpler, easier to remember, and more intimidating name, and that name is "sarin"). It is an extremely lethal poisonous gas, which can cause death even if it is not inhaled, and it is extremely toxic. The semi-lethal concentration of mustard gas, the famous "king of poison gas" at the level of World War II, is 1300 mg/ddm, while the semi-lethal concentration of sarin is only 0.1 mg/ddm! ), which is the thirty-fifth test item mentioned above. God, this thing is very, very, very efficient at killing insects, but it's also horribly toxic to warm-blooded animals. It is a terrible volatile liquid that can poison warm-blooded animals, including humans, even if not inhaled, but by mere skin-to-skin contact. In that case, his assistant Tommy accidentally came into contact with the volatile gas of the thing just a little bit on his skin, and he had severe symptoms of poisoning such as difficulty breathing, and almost died. Such a highly toxic poison cannot be used as an insecticide, otherwise, the insects will of course die completely, but the farmers who spray the insecticides are afraid that they will die faster than the insects. In order to ensure safety, Scrooge quickly sealed all the relevant materials, and warned all the personnel involved in the implementation not to tell the relevant details of the implementation. And don't let the Germans in the other groups know about it. For this, each of them also received a large amount of hush money.

"This kind of thing is too dangerous, God forbid, it's us who found it, not the Germans, to let those Germans have this, God knows if they will use this as a weapon in a war. If this thing were to appear on the battlefield, it would be a nightmare for humanity. Think about it, tens of thousands of people could be killed like bugs killed by pesticides. It doesn't even take a large-scale operation from a country like Germany, it's so easy to make that an average college student can make it in a small room in his backyard and kill an entire town in one night. It's horrible! Therefore, this technical information must be sealed and must not be made known to others. This is a responsibility to all mankind! ”

At that time, Scrooge said this very strictly, and then he went to the next door to make a phone call, and after a while, a group of heavily armed Blackwater security guards came, came in without saying a word, packed all the test materials into a few iron boxes, and then carried them out, I don't know where they were delivered.

However, today's real yàn is still quite successful. Judging by the half of the dead dose in rabbits, this insecticide is really not very toxic to warm-blooded animals compared to its ability to kill various pests. It is made into an emulsion and sprayed in a sprayer, which will not be too dangerous for farmers, and it is enough to wear a mask at most.

This insecticide is called bis-p-chlorophenyltrichloroethane. In the real yàn room, it is test item 58. There are more than a dozen experiments competing with it, but Dr. Harry is very confident in his product, although his product is not the strongest insect killing ability, nor the safest, but he is the most stable and easy to produce industrially, in this sense, he believes that the test product No. 58 that he is responsible for developing will definitely be able to beat those opponents in the stereotype competition.

Interestingly, his friend and competitor, Dr. Court, has also developed a new insecticide that is more than ten times more effective than his products, and is almost imperceptibly toxic to warm-blooded animals. Well, Dr. Court even drank a test-tube of that stuff in front of Scrooge. Almost everyone's eyes were conquered by what Dr. Court had taken out of something called pyrethrum. Although it is a bit difficult to prepare, even Scrooge believes that it is not impossible to rent a large piece of land to plant pyrethrum. Then, later, as the real yàn deepened, the weakness of this thing was gradually exposed, well, this thing is too unstable dìng, afraid of light, as long as it is exposed to the sun, it will not take long to decompose. But whose wheat fields are not exposed to the sun? So, well, according to Scrooge, this thing is good to use as an indoor mosquito killer, as for the use of pesticides, forget it, in contrast, the No. 58 test product will hardly be degraded due to the natural environment, and it is obviously much easier to use.

Scrooge was also very optimistic about the test item 58, and even gave him an abbreviated name: "DDT".

"Teacher, why don't these dead rabbits just send them to be incinerated?" Petrov asked as he threw the dead rabbits into the cart one by one, ready to push them out.

"Ah, I heard that we have to peel off the skin first, because rabbit skins are still very useful, and we can make several coats from the skins of rabbits that die every day." Dr. Harry replied, "We have plenty of money, but we have to be frugal where we can be frugal." ”

……

Compared with Jim's wheat, most of the wheat in other neighbors' homes is thin and yellow, only the wheat in Jim's field grows green, thick and neat, and it looks like a bumper harvest is about to be harvested, which makes Jim quite proud. To be honest, Jim had never seen wheat grow so well.

"If there are no baskets and no insect infestations that are too strict, there will probably be a good harvest this year." Jim thought.