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利用肥料防治农作物病虫害,不仅能防止因农药使用不当而造成的药害,还能有效地促进农作物的生长,且不伤害天敌,又不污染环境,可谓一举多得。1.氮肥常用的氮素化肥有碳铵、氨水、尿素,这三种氮素化肥都具有较强的挥发性,对害虫有刺激、腐蚀和熏蒸作用。尤其对红蜘蛛、叶螨、蚜虫、蓟马等一些体形小、忍耐力较弱的害虫以及蛴螬、根蛆、小地老虎等地下害虫,防治效果尤佳。如每亩(1亩=667平方米,下同)用250~500克尿素,加洗衣粉100克,兑水50千克,混合搅匀后制成“尿
The use of fertilizers to prevent crop pests and diseases can not only prevent pesticide damage caused by improper use of pesticides but also effectively promote the growth of crops without harming natural enemies or polluting the environment. Nitrogen fertilizers commonly used nitrogen fertilizer ammonium bicarbonate, ammonia, urea, these three nitrogen fertilizers have a strong volatility of the pests have stimulation, corrosion and fumigation. Especially for spider mites, spider mites, aphids, thrips and some small size, weaker endurance pests and mulberry, root maggots, small tigers and other underground pests, prevention and control effect is particularly good. Such as per acre (1 mu = 667 square meters, the same below) with 250 to 500 grams of urea, add washing powder 100 grams, watered 50 kg, mix well and made of ”urine