The main reason is that hydrogen peroxide has a strong oxidizing and sterilizing effect, which purifies the soil environment and reduces microbial damage to the root system, thus promoting the growth of plants.
An easy way to sterilize your potting soil requires hydrogen peroxide, known for being a disinfectant. Combine equal amounts of water and 3% hydrogen peroxide and pour this into potting soil that is in a container with drainage holes.
Because it oxygenates the soil, hydrogen peroxide may help aerate the soil, providing better access to oxygen for plant roots. It also helps disinfect the growing material to stave off bacteria and fungus. Mix two and a half teaspoons of hydrogen peroxide in a gallon spray jug.
Soil sterilization modalities with high efficacy at bench-scale include wet and dry heat, metam sodium, chlorine dioxide gas, and activated sodium persulfate. Simple oxidants such as chlorine bleach are ineffective in sterilizing soil.
You can sterilize the soil with hydrogen peroxide. Using a spray bottle, saturate the soil with the peroxide solution. Spray until the soil is moist but not soaked, and make sure to spray evenly, paying special attention to the corners. Before using the soil, let the hydrogen peroxide dry.
Solarization: Soil can be sterilized in a plastic sheet and put under the sun. This method may take about six to ten weeks to be effective.
Heat is the only practical means of treating soil physically. Complete treatment, or sterilization, requires heating soil to 2120 F. Partial treatment, or pasteurization, requires heat of 140 to 1600F.
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Double 6 is the strongest and longest-lasting vegetation killer you'll ever need. Double 6 contains a high potency, highly residual additive ensuring that you do the job only once a season. (Control may last up to 3 seasons depending on rainfall).
Under aerobic soil metabolism conditions, hydrogen peroxide degrades with a half-life of ca. 1.4 hours in diluted test solutions. This half-life value was extrapolated to ca. 7 hours for concentrated test solutions.
Soil Sterilization by Heat
The soil is steam sterilized either in special containers (soil sterilizers), into which steam is supplied under pressure, or on the greenhouse benches, in which case steam is piped into and is allowed to diffuse through the soil.
Hydrogen peroxide is effective in eliminating existing infections, but if used too much it will “sterilize” the entire potting soil killing not only the “bad” organisms but also the “good” ones and can even burn the roots if not diluted.
Hydrogen Peroxide (H2O2) is a strong oxidizing agent and oxidizes soil Carbon into Carbon Dioxide. However in doing so, H2O2 itself gets reduced into water at the same time. Thus, we observe bubbles (CO2) and water when H2O2 comes in contact with soil.
Three commercially available biological control agents can be purchased to control fungus gnats in pots or container media (Table 1). These include Steinernema nematodes, Hypoaspis predatory mites, and the biological insecticide Bacillus thuringiensis subspecies israelensis (Bti).
Some of the claims are that it aerates the garden, can be used as a fertilizer, cures root rot and fungal diseases, disinfects soil, disinfects greenhouse and garden equipment, encourages root growth, kills weeds, repels insects, sanitizes seeds and speeds germination, and treats water.
A 7% stabilized hydrogen peroxide proved to be sporicidal (6 hours of exposure), mycobactericidal (20 minutes), fungicidal (5 minutes) at full strength, virucidal (5 minutes) and bactericidal (3 minutes) at a 1:16 dilution when a quantitative carrier test was used 655.
Similar to neem oil, you could use a combination of water and hydrogen peroxide. Mix these together in a container and cover your soil to begin the soil mite removal process. By using this regularly, you should begin to see mite-free soil.
To sterilise potting mix
Saturate the soil with 1/2 cup hydrogen peroxide 3% per 1 litre water.
Be sure to remove any insects, place the soil in an oven-safe pan, and cover with foil. Bake at 175 to 200 degrees Fahrenheit for 30 minutes. You also can microwave 2 pounds of soil in microwavable containers at full power for 90 seconds. Now that your soil is sterile, you can use it again.
If you're spraying or watering the soil for fungus, eggs or larvae, be certain you really soak the soil. If you have any of these problems, you can use hydrogen peroxide on your plants once a week.
However, the two most common soil-sterilant herbicides encountered in landscape settings are tebuthiuron (Spike) and imazapyr (Arsenal AC).
Herbicidal soaps are also popular Roundup alternatives that use fatty acids to kill weeds. Corn gluten meal can also kill grass weeds and broadleaf weeds. Spreading 20 pounds for every 1,000 square feet of garden and waiting five days before watering the area should kill weeds for up to six weeks.
SODIUM HYPOCHLORITE. Chlorine is the universal disinfectant, active against all microorganisms. It is generally served in the form of sodium hypochlorite, with different concentrations of free chlorine.
Solarization. Using the natural heat of the sun is a common way to sterilize large amounts of soil, especially entire gardens or fields.
Heat. Heating the soil is very effective and the soil can be used immediately after cooling, unlike chemically treated soil. Many plant pathogens are killed by short exposures to high temperatures. Most plant pathogens can be killed by temperatures of 140°F (60°C) for 30 minutes.
Bacterial predators, including bacteria-feeding nematodes, protists, bacteria (Bdellovibrio and like organisms, Lysobacter, and myxobacteria), and bacteriophages are responsible for bacterial turnover in soils that lead to many ecosystem services.