Non-polluted vegetables refer to the content of harmful substances (such as pesticide residues, heavy metals, nitrites, etc.) in vegetables, which are controlled within the permissible range of the state and are not harmful to human health after consumption. So how do you prevent pests from producing pollution-free vegetables?
1. Insect pest control
Pick up 100 grams of dead cabbage caterpillar from the field, smash and add 200 ml of water to soak. After 24 to 28 hours, filter the insect solution, dilute with 45 kg of water, add 45 g of washing powder, stir well, spray on the cabbage caterpillar. On the vegetables, it has a good control effect.
2, pepper water control cabbage caterpillar
Use 150 grams of pepper per acre (the more spicy the better), smash, add 1 kg of water and boil for 30-40 minutes, filter with gauze, dilute the filtered pepper water with 5 kg of water, choose sunny day 10-12. It is sprayed on the vegetables that produce cabbage caterpillar from 3 to 5 in the afternoon to prevent the cabbage caterpillar from being excellent.
3, the grass and ash
Roots are important pests of vegetables such as onions, garlic, leeks, cabbage, etc. Roots are like wet and dry, and the application of plant ash in the rhizosphere of crops can inhibit their development, which is unfavorable for their survival and has good control effects. At the same time, the ash is a good fertilizer, which can improve the resistance and have obvious effect of increasing production.
4, urine washing agent treatment of aphids
Use 250 grams of urea, 150 grams of washing powder, and add 50 kilograms of water to mix and form a "urine washing agent". After the washing powder is completely dissolved, spray it. It not only has a good control effect on vegetable aphids, but also has the effect of foliar spray fertilizer to promote plant growth. Pay attention to the current use to prevent urea volatilization.
5, fresh urinary mites
Each acre of vegetables with fresh human urine 35 kg, add water 30 kg, diluted in the sunny day 10-12 hours, 3-6 in the afternoon sprayed on the locust-producing vegetables, the effect of killing mites is more than 95%. If 0.2% neutral detergent is added to the urine, the effect is better.
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