美国在20世纪30年代曾出现“黑风暴”现象,给美国农业经济带来非常大的影响,因此美国一直关注保护性耕作技术的推广和应用。为了适应需求,迪尔公司率先研制并生产保护性耕作技术所需的各种农业机械。1978年,我国黑龙江省农垦总局引进迪尔公司的成套保护性耕作机械,其中包括联合收割机茎秆粉碎抛撒装置、915V型深 The phenomenon of “black storm” in the United States in the 1930s brought a very big impact on the U.S. agricultural economy. Therefore, the United States has always been concerned about the promotion and application of conservation tillage technology. In response to demand, Deere pioneered the development and production of a wide range of agricultural machinery for conservation tillage technology. In 1978, China’s Heilongjiang Provincial Land Reclamation Bureau introduced Deere’s complete set of protective tillage machines, including a combine harvester stalk crushing and throwing device, 915V type deep