一、国外植保机械发展概况国外植保机械的发展,根据各国的具体情况,各有其特点。如日本地块较小,经营分散,故以发展小型动力配套的背负式和担架式植保机械为主。为了提高效率,近年来开始发展较大型植保机械,如自走式机动喷粉喷雾弥雾机。美国、苏联、加拿大等国,土地面积大且较平坦,故以发展拖拉机配套的 First, the development of foreign plant protection machinery Development of plant protection machinery abroad, according to the specific circumstances of each country, has its own characteristics. Such as Japan, the smaller plots, scattered management, it is to develop a small power-supporting knapsack and stretcher-based plant protection machinery. In order to improve efficiency, in recent years began to develop larger plant protection machinery, such as self-propelled mobile spray mist fog machine. The United States, the Soviet Union, Canada and other countries, the land area is large and relatively flat, so to develop tractor supporting