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美国农场的谷物干燥机械化,是随着联合收割机的广泛使用和综合种用而迅速发展起来的。同时在干燥技术发展起来之后,才可能更广泛采用联合收割机。例如:五十年代中期以后,特别是1960～1970年间,随着干燥技术的推广,美国农场采用直接收获籽粒玉米的技术才迅速推广。目前美国玉米种植区已有80～90%的种植面积,采用联合收割机直接收获籽粒玉米的方法。但直接收获的玉米籽粒含水率高,一般达27～30%,这样玉米干燥就成了美国农业机械化中急需解决的重点问题。据美国农业部统计局资料介绍,1972年在美国玉米种植区的五个州中,有40%的玉
The mechanization of cereal drying in American farms is rapidly evolving with the widespread use and combination of combine harvesters. At the same time, it is possible to make the use of combine harvesters more extensively after drying technology has been developed. For example, after the mid-1950s, especially between 1960 and 1970, the technology of direct harvesting of grain corn in US farms was rapidly promoted with the promotion of drying technology. At present, there are 80-90% of the acreage in the corn growing area in the United States, and the method of harvesting the grain corn directly by the combine harvester is adopted. However, the direct harvest of corn seeds with high water content, usually up to 27 to 30%, so that corn drying has become the United States agricultural mechanization urgently needed to solve the key issues. According to USDA data, in 1972, 40% of the five states in the US corn-growing area