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一、何谓“超低容量” 塞依耳(Sayer)于1959年最早采用“超低容量”(Ultra Low Volume简称 ULV)的名称,使用的剂量相当于每亩(合6.07市亩)0.025加仑(0.114公升)。当时常规使用的高容量器械每亩达200—600加仑(910—2,730公升)药液,即如低容量器械每亩也要50加仑药液。塞依耳当时使用的只是高浓度(20％狄氏剂)的杀虫药剂。以后逐步发展到用未经稀释的杀虫药剂原液,因此更降低了药剂的使用容量,每亩甚至降到0.5液两或更少。美国农业部对超低容量喷洒的杀虫药剂规定为每亩用量不超过半加仑(即2.27公升)。所谓“超低容量”,最主要的还是决定于药剂的使用容量,每亩不超过半加仑。其次是杀虫药剂的浓度,用不稀释
First, what is meant by “ultralow volume” Sayer first adopted the name “Ultra Low Volume” (ULV) in 1959 at doses equivalent to 0.025 gallons per mu (6.07 mun acres) 0.114 liters). At that time, conventional high-capacity instruments used 200-600 gallons (910-2,730 liters) of liquid per acre, or 50 gallons of liquid per acre for low-capacity equipment. Seyère used only the insecticide at a high concentration (20% dieldrin). After the gradual development of insecticide with undiluted stock solution, thus reducing the use of pharmaceutical capacity, even reduced to 0.5 liquid per acre two or less. USDA specifies that pesticides sprayed at ultra-low capacity should not exceed half a gallon (2.27 liters) per acre. The so-called “ultra-low capacity”, the most important thing is decided by the use of pharmaceutical capacity, no more than half a gallon per acre. Followed by insecticide concentration, with no dilution