Research and practice have proved that the use of chemical fertilizers or organic fertilizers to control crop pests and diseases is not only economic, safe and effective, but also saves pesticides. At the same time, it has the characteristics of fertilizing and not harming natural enemies and not polluting the environment. Promoted in production.
Nitrogen fertilizer: 1 ammonium bicarbonate, ammonia and other ammonium nitrogen fertilizers have strong volatility, have certain stimulation, corrosion and fumigation effects on pests, especially for small spiders, aphids, thrips and other small, weak endurance pests, the effect better. Application method: Spray evenly with 1% ammonium hydrogencarbonate or 0.5% ammonia aqueous solution, spray once every 5 to 7 days, and spray 2 to 3 times. 2 Urea has the function of destroying chitin of insects, and is mixed with urea, washing powder and water in a ratio of 4:1:400. It is a mixture of aphids and cabbage caterpillars that harm cotton, vegetables and flowers. Various pests such as red spider beads have good control effects. 3 When wheat rust occurs sporadically, it is sprayed with 50% fresh urine or 3% ammonium sulfate aqueous solution, and the effect is good.
Phosphate fertilizer: Application method: 1 The oxalic acid secreted by the glandular hair of the cotton head has an attracting effect on the cotton bollworm moth. In the adult stage of cotton bollworm, 1-2% calcium perphosphate leaching solution is used for foliar spray fertilizer, which can change oxalic acid into calcium oxalate and lose the attraction to cotton bollworm. In this way, the amount of eggs in the cotton field can be reduced by 33.3% to 73.4%, with an average of 55%, and the duration of each spraying of phosphorus is generally 2 to 3 days. 2 Tomato umbilical rot is a physiological disease caused by calcium deficiency in plants. Starting from the initial flowering stage of tomato, the leaching solution of 1% superphosphate is sprayed once every half month, and even sprayed 2 or 3 times. The disease prevention effect is obvious.
Potassium fertilizer: Potassium can enhance the stress resistance of crops, and the application of potassium fertilizer can inhibit the pests and diseases of various crops. According to reports, among the 740 fungal diseases and 68 bacterial diseases, 71% and 75% were reduced by potassium, respectively, and 59% of the 230 pests (èž¨) were mitigated. In production, the potash fertilizer that is directly used to control crop diseases and insect pests is grass ash. Application method: 1 using 10 kg of plant ash, 50 kg of water, soaking for 24 hours, filtering, taking the filtrate spray, can effectively kill the mites on the crop; 2 before planting onion, garlic or leeks, using ash per acre 20 kg, applied to the bottom of the ditch, or in the seedling stage of onions, garlic, alfalfa and other vegetables, 15 kg of grass ash per acre, and then paddling the soil, the root mites can be significantly reduced, and the vegetable yield is increased by 15-20%. 3) When wheat sheath blight occurs at the beginning, 30 to 40 kilograms of plant ash per acre is used. When the morning dew is not dry, the ridge is removed from the base of the wheat plant, which has a certain effect on controlling the spread of the disease; for the fruit tree with root rot, First digging the root soil, scraping off the root bark of the disease, drying it slightly, and then planting 2.5 to 5 kilograms of plant ash per plant. After about 1 to 2 months, the diseased tree can emit new roots.
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