Weeding with biotechnology is an effective way for the development of plant protection. Its economic security, long-lasting effect, and no pollution to the environment are in line with the concept of harmonious development between man and nature. It will surely occupy an extremely important position in the 21st century.
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First, use grass roots bacteria to weed. US microbial experts have found in the study of biological weeding that bacteria can acquire organic substances from the roots of plant roots. Pseudomonas and Owennia from the plant roots have obvious biological weeding potential. Line grass is the main weed that harms soybeans and corn. Scientists used two Pseudomonas species, about 2.5 bacteria mixed with peat soil, applied to a 1 m2 field of seminal hairy grass seeds. In the month, the rate of weeding was 35% to 40% lower than that of the non-bacterial control plot, and the seedling height was also 35% to 43% lower. Obviously, this method has great potential for weeding.
Second, biological pesticides weeding. Using extracts that have inhibitory effects on certain weeds in plants, spraying farmland has both killing weeds. It has no effect on the environment. China began to use it as early as the 1950s, and there are many such targeted pesticides.
Third, weeding with microorganisms. Some microorganisms have a characteristic that it infects only one or a few plants but does not infect other plants at all. Experts are using the unique characteristics of microbial pathogens to control weeds. In recent years, in China, we have discovered a black powder fungus that can control the dry weeds in the Ma Tong. The disease does not develop in grass crops, and the incidence rate on weeds and horse ponds is as high as 98%. This result has found a new way to exploit early weed control.
Fourth, the use of plants with phase g inhibit weeds. Phylogenetic phenomena exist among plants. A plant secretes special substances that can inhibit or repel another plant. Therefore, this phase can be utilized to effectively suppress weeds by the method of rotation. For example, sunflower can inhibit weeds such as purslane, mandala, etc.; sorghum can inhibit the growth of weeds such as big bluestems, paniculata, and green onions can inhibit the growth of weeds such as underground bamboo grass. Biologists are looking for and nurturing herbicide-resistant and weed-killing crops. If they can take full advantage of the herb's own herbicide-resistance and weed control characteristics, they will not only reduce costs, but will undoubtedly benefit the global environment.
Fifth, use insects to weed. Different insects have different feeding habits. Using this feature, weeding purposes can be achieved. For example, in Hunan, China had used cabbage leaf to control the reservoir and the Alternanthera philoxeroides on the edge of the paddy field and received good results.
Sixth, use weeds in livestock. Use of livestock to eat weeds, weeding and fattening livestock, livestock and livestock manure can also be fertilizer, save labor and save more. If a rabbit is raised in a tomato garden, it will quickly eat net weeds but will not eat tomatoes. In some parts of southern China, lakes and ducks are put into rice fields during jointing of rice to heading. This kind of duck is specialized in eating weeds and pests. But do not eat straw, artificial cultivator, is conducive to the role of rice growth.
7. Weeding with home fish. Sandy grass, duckweed, etc. in rice fields grow fast and reproduce quickly. Weeding by artificial or chemical methods is not effective. For example, when fish is raised in paddy fields, 180 to 200 grass carp are put into every acre. These weeds are eaten clean by grass carp.
Weeding with biotechnology