Pharmaceuticals are applied into the soil before and after sowing to prevent the spread of seed-borne diseases and soil-borne diseases. The main pesticide application methods are as follows: 1. Spraying or irrigation method. Dilute the pesticide to a certain concentration with water and spray it on the surface of the soil with a sprayer, or irrigate it directly into the soil so that the liquid can penetrate into the deep soil and kill the pathogens in the soil. Spray application of pesticides to treat soil is suitable for fields, nursery nutrient soil, lawn renewal, etc. The irrigation method is suitable for the irrigation of fruit trees, melons, and solanaceous crops and the disinfection of various crop seedbeds. Commonly used disinfectants include Luheng No. 1 and No. 2, etc., which can prevent and control seedling diseases with remarkable results. 2. Poison soil method. First mix the medicine into poisonous soil and then apply it. The preparation method of toxic soil is to mix pesticides (emulsifiable concentrate, wettable powder) and fine soil with a certain humidity in proportion. Application methods for poisonous soil include ditch application, hole application and broadcast application. 3. Fumigation method. Use a soil syringe or soil sterilizer to inject the fumigant into the soil, cover the soil surface with a film or other covering, and spread it in a closed or semi-closed facility to kill the germs. After the soil is fumigated, sowing can only be done after the pesticide is fully dispersed. Otherwise, phytotoxicity may easily occur. Commonly used soil fumigation disinfectants include methyl bromide, formaldehyde, etc. This method is used in the planting of strawberries, watermelons, and vegetables in facility agriculture, as well as in the seedbeds of seedlings and green lawn planting. The solar disinfection method is to uproot the old plants in the field after harvesting crops in the greenhouse or field, apply more organic fertilizers, and then level the ground. In July to August, when the temperature reaches above 35 degrees Celsius, use a transparent heat-absorbing film If covered well, the soil temperature can rise to 50 to 60 degrees Celsius and sealed for 15 to 20 days, which can kill various pathogens in the soil. This method is suitable for use in greenhouses where strawberries, watermelons, and flowers are grown year after year in northern my country. Steam thermal disinfection Steam thermal disinfection of soil is heated by a steam boiler and the steam heat energy is sent to the soil through a conduit to increase the temperature of the soil and kill pathogenic bacteria to achieve the purpose of preventing and controlling soil-borne diseases. This disinfection method requires relatively complex equipment, is only suitable for crops with high economic value, and is applied to a small area on the seedbed. Exposed soil disinfection and sterilization is an economical, convenient and effective disinfection and sterilization method for small flower gardens and amateur flower cultivation enthusiasts. The operation method is to spread the soil evenly on the cement floor or other hard ground in summer and expose it to the sun until it is completely dry. The temperature of hard ground under direct sunlight in summer can reach over 60°C and up to 75°C. The nymphs and adults of some pathogenic fungi and pests in the soil and the larvae of other animals, as well as weed seeds that have germinated or are about to germinate, can be It can kill, in addition, it can cause slugs, snails, etc. to explode, and cause earthworms, grubs, rats, millipedes, etc. to dry out.
If you can spray 50% Polyvinyl WP or 500-600 times of 65% Metazin WP during drying, add 50% Phim EC or 40% Omethoate It is better to use 1000 times liquid of emulsifiable concentrate, stir it as you spray it, and lead or assist in insecticide and sterilization. Sun-exposure disinfection and sterilization is suitable for the soil of all potted flowers.