在防治果树害虫的药液中混用1％的尿素或硝酸铵可以使甲基对硫磷、三甲硫吸磷、敌百虫等农药明显增效。在近年来防治马铃薯晚疫病,小麦锈病、稻瘟病等试验的基础上,又进行了三年果园的小区试验和大田试验。方法:早晨(6—10时)或晚上(18—23时)喷洒,喷洒量是500升/公顷。根外追肥用尿素(含氮46％)和液态复合肥(含氮10％、磷34％、不含钾)。小区试验的处理浓度为 Mixing 1% urea or ammonium nitrate in pesticide solution for preventing and curing fruit pests can obviously enhance the efficiency of pesticides such as methyl parathion, trimethylsulfate and trichlorfon. In recent years, prevention and control of potato late blight, wheat rust, rice blast and other tests, based on the three-year orchard plot and field trials. Method: Spray in the morning (6-10 hours) or evening (18-23 hours) with a spray rate of 500 liters / ha. Root top dressing with urea (46% nitrogen) and liquid compound fertilizer (nitrogen 10%, phosphorus 34%, non-potassium). Cell test concentration of treatment