Application of ozone generator in vegetable and fruit production in greenhouse
The low-quality ozone produced by the greenhouse disease ozone control machine can prevent and control all the air-borne and soil-borne diseases of greenhouse fruit and vegetable crops such as cucumber, melon, eggplant and strawberry. The average comprehensive control effect exceeded 78%. The control effect of cucumber, gray mold, downy mold and other air-borne diseases is 90%-100%, and the control effect of soil-borne diseases such as epidemic and spreading is 73%-100%. The control effect of gray mold of eggplant is within 94%-100%, and the control effect of verticillium wilt of eggplant is within 90%-100%.
Practice has proved that the ozone diffusion tube laid on the height of 1.5-2 meters can prevent and control the diseases of low vegetables such as eggplant and green pepper significantly higher than that of cucumber, melon, beans and other high seedlings. This is directly related to the proportion of ozone and the way ozone disperses. Improvement of ozone diffusion can significantly improve the effect of disease control. On the other hand, in addition to the significant control effect, the control effect on aphids was within 63% to 86%, but there was no significant control effect on whitefly, red spider and spot miner. The ozone concentration was increased to 1.2×106 for 30 minutes. Whitefly and starscream are inactivated, and spot divers are inactivated for 120 minutes, but this ozone concentration disrupts the photosynthetic system of plant leaves within minutes. Therefore, ozone can only be used for plant disease control, not pest control.
Precautions for using ozone generators:
(1) The use at the beginning of seedling can significantly prevent the occurrence of gas-borne diseases during the whole growth period, and the use in the middle of growth can show the effect within one month. Special tips: When used in the middle growth of cucumber, ozone can first aggravate cucumber disease (photosynthesis is inhibited), but 20 to 45 days later, after the melon seedlings adapt to the ozone environment, the disease began to significantly reduce, and the later growth is strong, no disease.
(2) Reasonable determination of ozone concentration and release time. The release concentration and release time of ozone should be properly adjusted according to different crops and their growth periods. Ozone is more adaptable to ozone than seedling crops. If the ozone concentration is too high or the release time is too long, it will lead to the poisoning and drying of greenhouse vegetable leaves and flowers, and even lead to plant death.
(3) Temperature and humidity regulation. When ozone is released, the temperature in the shed should be kept below 30 degrees, and the influence of humidity is much more complex. The effect of high humidity and light is worse than that of high humidity and no light.
(4) When used for a long time in winter, the ozone pipe is easy to collect water, because the ozonated air contains nitrogen oxides, and the water will form strong nitric acid over time. Pay special attention when discharging, on the object.
Ozone has the characteristics of wide bactericidal spectrum, fast bactericidal speed, simple use and no secondary pollution, which meets the requirements of pollution-free vegetable production. Greenhouse disease ozone control machine is used to prevent the disease treatment of fruits and vegetables, edible fungi and other agricultural products, not only good effect, but also good quality, and to a certain extent, improve the output. It is one of the ideal control measures to protect pollution-free vegetable production, and can be popularized in production.
