1984年4月11—25日,襄樊市请省民航局派23架飞机,在襄阳、枣阳、随州、宜城、老河口、谷城、襄北农场的上空,对53个区、镇、场的175.72万亩小麦喷施了磷酸二氢钾,取得了很好的效果。为了掌握飞机喷肥效果的准确数据,全市固定了56名技术干部,在6个县、市安排了48个测试点,进行了飞机喷肥与不喷肥的对比试验。作法是:在飞机喷肥前10—20分钟,用长6米宽2米的薄膜盖在麦子上面,喷肥后15分钟揭除薄 From April 11 to April 25, 1984, Xiangfan City asked CAAC to send 23 aircraft to airfields in 53 districts, towns and villages in Xiangyang, Zaoyang, Suizhou, Yicheng, Laohekou, Gucheng and Xiangbei Farm. The field of 1.7572 million mu of wheat sprayed with potassium dihydrogen phosphate, and achieved good results. In order to grasp the accurate data of the effect of airplanes spraying, the city fixed 56 technical cadres and arranged 48 test points in 6 counties and cities. Practice is: 10-20 minutes before the aircraft fertilization, with a film length 6 meters wide and 2 meters covered in wheat, 15 minutes after spraying thin