Fertilizer used to be a good crop disease less

Research and practice have proved that the use of chemical fertilizers or organic fertilizers to control pests and diseases of crops is not only economical, safe, and effective, but also can save pesticides. At the same time, it also has the characteristics of fertilizing and does not harm natural enemies, and does not pollute the environment. It is worth mentioning. It is worth it. Promote in production.

Nitrogen Fertilizer: 1 Ammonium nitrogen fertilizers such as ammonium bicarbonate and ammonia water have strong volatility, and have certain irritating, corrosive and fumigating effects on pests, especially for small, weak endurance pests such as spider mites, aphids, and thrips. better. Application method: spray evenly with 1% ammonium bicarbonate or 0.5% ammonia solution, spray once every 5 to 7 days, and spray 2 to 3 times. 2Urea has the effect of destroying the chitin of insects. It is prepared by mixing urea, washing powder and water in a ratio of 4:1:400. It is used for locusts, cabbage worms, and other insects that damage cotton, vegetables and flowers. Red spider bead and other pests have good control effect. 3 When sporadic wheat rust occurs, spray with 50% fresh urine or 3% ammonium sulfate solution works well.

Phosphate Fertilizer: Application Method: 1 The oxalic acid secreted by the glandular hairs on cotton tender head has an attractive effect on the cotton bollworm moth. In the adult stage of Helicoverpa armigera, 1-2% of superphosphate leaching solution was used as foliar spray fertilizer to make oxalic acid become calcium oxalate and lose its attractiveness to cotton bollworm. In this way, the amount of eggs laid 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 plant calcium deficiency. From the initial flowering stage of tomato, 1% superphosphate leaching solution was sprayed once every half month, and sprayed for 2 to 3 times. The disease prevention effect was obvious.

Potassium fertilizer: Potassium can enhance the stress resistance of crops, and increasing potassium fertilizer has an inhibitory effect on a variety of crop pests and diseases. According to reports, 71% and 75% of the 740 fungal diseases and 68 bacterial diseases were reduced due to potassium, and 59% of the 230 species of insect pests were attenuated. In production, the most directly used potassium fertilizer for controlling crop diseases and pests is plant ash. Application method: 1 10 kg of plant ash, watered 50 kg, soaked for 24 hours after filtration, take the filtrate spray, can effectively kill the crop on the aphids; 2 in the onion, garlic or leeks ditch planting, per acre with plant ash 20 kilograms, applied to the bottom of the ditch, or in the vegetable seedling period of onion, garlic, wolfberry, etc., 15 kg of plant ash per acre, and then scratching and covering the soil, can significantly reduce the damage caused by the root bark, and increase the yield of vegetables by 15 to 20%. 3 In the early days of wheat sheath blight, 30 to 40 kg of plant ash was used per acre. When the dew had not yet dried in the morning, Shun ridge was withdrawn at the base of the wheat plant, which had certain effect on the control of disease spread. For fruit trees with root rot, The roots were first dug, the root bark of the disease was scraped off, and dried slightly. Then 2.5 to 5 kg of plant ash were planted. After about 1 to 2 months, the diseased trees could issue new roots.

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