How did the United States get rid of weeds in the fields? Can you talk about it?

When farming, there will always be a lot of weeds in the field, which is difficult to remove. If these weeds are not cleared, they will compete with crops for nutrition. Most weed control methods in China rely on pesticides. Pesticides are mainly used to kill weeds in the field, whether by manual spraying or mechanical spraying. What about abroad? Do you also use pesticides?

As the world's largest agricultural exporter and one of the most developed countries in agriculture, the United States did not choose to store grass with chemical pesticides, but used the most primitive flame to remove weeds. Propane is used in flame weeding machine. After ignition, the machine can weed the fields at a speed of about 10 km per hour. Generally speaking, weeds are burned before corn or soybean crops are planted, even before germination. A clean-up can prevent a large number of weeds from appearing in this land in about three years. These flames will not burn weeds to ashes, but the temperature is just enough to destroy the cell structure of weeds, so that weeds can not carry out photosynthesis and die slowly. The flame temperature is generally controlled at 1000 to 1500 degrees Celsius. At the same time, the concentration of flame can also remove weeds after emergence, and sometimes weeds and some residual straw will be removed again after autumn harvest, which can make the land more fertile and extend to the ground to destroy the roots of weeds. Moreover, there is another advantage that pests and some eggs hidden underground will also be killed because of high temperature.

The principle of this flame mower is not complicated, even for any fire rack, it is very simple, mainly composed of gas tank and flame spraying rack, and then towed by tractor. In addition to this large-scale flame herbicide, there are also small-scale ones, which are manually moved. The overall structure is very similar to the traditional electric back medicine barrel in China, except that the medicine barrel is filled with propane instead of chemical pesticides. This small herbicide is mainly used to clean some crops that are not suitable for large-scale mechanical weeding, because propane is a clean combustible gas and will not have any impact on the air. This weeding method is very popular abroad, and many farms have given up the weeding method of chemical pesticides. It is necessary to know that pesticide weeding is convenient and fast, but the harm is more serious. In the process of weeding, there will be a lot of pesticide residues on crops, which will easily enter our stomachs if they are not cleaned up.

If people use fruits and vegetables containing pesticide residues for a long time, it will not only affect our health, but also affect the development and growth of future generations. Moreover, pesticides are also a kind of dangerous goods, and deaths caused by pesticides are common every year, causing many tragedies. However, pesticides also have an advantage, probably that they are cheap, and the investment in flame weeding is relatively large.