Fertilizer

Many fertilizers have a killing and repellent effect on pests. Ingenious fertilization has the effect of controlling pests.
Phosphate fertilizer Helicoverpa armigera is sensitive to phosphorus during spawning, and escapes when exposed to phosphorus. During the spawning of cotton bollworm, 2% superphosphate leaching solution is sprayed every 5-6 畦, leaving 1 畦 without spraying, which can drive the cotton bollworm to concentrate on spawning, so as to eliminate it centrally.
Silicon-calcium fertilizer, corn, soybean and other crops, 30-40 kg of silicon-calcium fertilizer per acre can avoid the damage of corn borer and bean pod. For rice, wheat and other crops, applying 20-30 kg of siliceous calcium fertilizer per acre can greatly reduce the damage of armyworms.
Nitrogen fertilizers such as urea, ammonium bicarbonate and ammonia are volatile, and have certain stimulation, corrosion and fumigation effects on pests. Use urea 250-800 grams, add 100 grams of washing powder, spray 150 kg of water, can control pests such as red spiders, mites and so on.
The grass ash is taken from 20 kg of grass ash, soaked in 80 kg of water for a day and night, and the filtrate is sprayed, which can effectively control the mites. In the onion, garlic, and leeks, 20-30 kg of grass ash per acre of ditch can be applied to prevent root sputum and increase production.
Fertilizer mixed with 50% dichlorvos EC (concentration 1%) in 1% urea solution can kill red spiders that harm citrus, cotton and flowers. 50 grams of 40% dimethoate emulsifiable concentrate per acre, 250 grams of urea, 50 kilograms of water, sprayed at the booting stage of rice, can not only prevent rice pests, but also promote rice yield. In the soybean seedling stage and the initial flowering stage, 50 grams of ammonium molybdate, 50 grams of 50% phoxim emulsifiable concentrate per acre, and 50 kg of water are sprayed to treat both molybdenum deficiency and control of aphids and pea pods.
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