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Scientific fertilization to prevent pests
Ammonium bicarbonate is highly volatile and has strong irritant, corrosive, and fumigant properties, making it effective against small pests like spider mites, aphids, and thrips. To use it, mix a 1% solution of ammonium bicarbonate and spray evenly on the affected plants. Repeat the application every 5 to 7 days for 2 to 3 times for best results.
Urea can disrupt the chitin in insect exoskeletons, making it an effective natural pesticide. Prepare a mixture using 4 parts urea, 1 part washing powder, and 400 parts water. This solution works well against pests such as locusts, cabbage worms, and red spider mites that damage cotton, vegetables, and flowers.
Superphosphate, when used as a foliar spray at a concentration of 1% to 2%, can significantly reduce egg-laying by cotton bollworms. It decreases the number of eggs laid in cotton fields by 33.3% to 73.4%, with an average reduction of 55%. The effect typically lasts for 2 to 3 days.
Plant ash is a rich source of potassium, phosphorus, calcium, magnesium, sulfur, and micronutrients like boron, manganese, copper, zinc, and molybdenum. To control aphids, mix 10 kg of plant ash with 50 liters of water, let it soak for 24 hours, then filter and spray. During the seedling stage of cotton, spreading 20–25 kg of plant ash per acre along the ridges helps raise soil temperature and reduce diseases like blight and anthrax. Before planting onions, garlic, or leeks, apply 20 kg of plant ash per acre at the bottom of the furrow. In the vegetable seedling stage, spreading 15 kg of ash per acre and covering it with soil can reduce root boring and increase yield by 15% to 20%.
Silicon-calcium fertilizer enhances crop resistance by accumulating silicon in the epidermal cells, forming a protective layer. Applying 30–40 kg per acre to crops like corn and soybeans reduces damage from corn borers and soybean meal. For rice, this fertilizer increases silicification, boosting disease and pest resistance. Yield increases by 10% to 50%, and rice blast incidence drops by 0.3% to 19%. Returning 1/3 to 1/2 of high-silicon early rice straw to the field can also reduce panicle blast by 2.63% to 7.23% and lower rice leaf roller infestations.
Zinc fertilizer, when sprayed at 0.05% to 0.1% zinc sulfate solution after sweet pepper flowering and fruiting stages, helps reduce virus disease and improves fruit setting rate and weight. This can boost production by 15% to 37%.
Manganese fertilizer is beneficial for Chinese cabbage. Apply manganese as a base dressing during sowing, or spray 0.1% to 0.2% manganese sulfate solution during the seedling, rosette, and filling stages. This effectively prevents heart disease, increasing yield by 10% to 18% and improving quality.