Soil disinfectants can be divided into: pesticides and microbial preparation fungicides. Pesticide-based fungicides are characterized by high toxicity, systemic and conductive properties, such as: methyl bromide, calcium cyanamide, etc.; Peroxyacetic acid disinfectant, chlorine dioxide disinfectant because of its bactericidal, non-toxic, environmentally friendly and efficient characteristics, it will become the future development direction of soil disinfection.
Due to heavy planting, soil-borne diseases such as root-knot nematodes have become a prominent problem in greenhouse vegetable production. It is very important to carry out soil disinfection in the idle period of greenhouses. At present, there are mainly the following soil disinfectants.
Methyl bromide Before use, remove residual straw and root system, deep-turn the soil at least 30 cm, apply the base fertilizer, break up the large clods, and ensure that the temperature of the soil at 20 cm deep is at least 8 °C. The higher the temperature, the stronger the fumigation effect. When handling, take a small arch shed and cover the shed film. Generally, 40 kg per mu is used, 1 can of medicine is placed every 13 square meters, and a small piece of plastic cloth is placed under the medicine can. When the medicine is applied, the medicine can is stuck on the can opener, and the film is pressed down through the covered film. The can, the sharp edge of the can opener pierces the can, and the methyl bromide is discharged into the underlying plastic cloth in a liquid state, and is vaporized after a few minutes. It is necessary to be cautious when using methyl bromide. It is strictly forbidden to operate during the ventilation period. The fumigation period should be about 15 days. Only when the film is ventilated for more than 30 days can it be planted. Since methyl bromide is effective against pathogens, weeds, nematodes, insects and mites, and the use of methyl bromide has a significant effect on cucumber and tomato production, it is widely used.
Calcium cyanamide is generally first sprinkled with soil and manure into the shed. After rotary tillering with a rotary tiller, the calcium cyanamide is evenly spread on the shed, and then evenly spread with a rotary tiller to cover the mulch, 20~25 days later. Uncover the film.
Xinnuohua brand chlorine dioxide disinfectant has the best effect on soil bacteria, soil-borne diseases and root-knot nematodes. The method of using chlorine dioxide is activated, diluted with water, sprayed to wet, and infiltrated into the soil by about 5-6 cm. , keep it for 30 minutes. It is also possible to use chlorine dioxide disinfectant to water the land with water. Usually, chlorine dioxide disinfectant can reduce the amount of pesticides, prevent and cure a variety of page diseases, and degrade heavy metal residues. Consult the company's technical staff for specific usage.
Sanqiao brand peracetic acid disinfectant Peracetic acid is a strong oxidant. It relies on its powerful anti-virus mechanism to kill all microorganisms and bacteria. It has a strong killing effect on plant bacterial, fungal and viral diseases. Because its decomposition products are acetic acid, water, oxygen, long-term use will not cause residue and environmental pollution, the use of methods are spray, flood irrigation, etc., please consult our technical staff for specific methods.
