Twentieth Century Crop Statistics, 1900-2017

The Twentieth Century Crop Statistics, 1900-2017 data set consists of national or subnational maize and wheat production, yield, and harvested area statistics for all available years for the period 1900-2017. It combines a new digitization of crop statistics from Italy, Spain, Indonesia, China, Mexico, Uruguay, Chile, Sweden, and Morocco with existing, publicly available, digitized data sets from India, Australia, the United States, Canada, Southern Brazil, Argentina, England, Austria, Belgium, Croatia, Czech Republic, Finland, Germany, Spain, Portugal, France, the Netherlands, and South Africa. All Units are converted to hectares (ha) for Units of harvested areas, tonnes for Units of production, and tonnes/ha for Units of yield. A ratio of 1/36.744 is used to convert wheat bushels to tonnes, and a value of 1/39.368 is used to convert maize bushels to tonnes. In all cases, the Harvest_year reported in the data set is the harvest year for the crop.

《二十世纪农作物统计》数据集，涵盖1900年至2017年间各国或次国家玉米和小麦的生产、产量及收获面积统计数据。该数据集融合了对意大利、西班牙、印度尼西亚、中国、墨西哥、乌拉圭、智利、瑞典和摩洛哥等国家农作物统计数据的全新数字化处理，以及来自印度、澳大利亚、美国、加拿大、南巴西、阿根廷、英格兰、奥地利、比利时、克罗地亚、捷克共和国、芬兰、德国、西班牙、葡萄牙、法国、荷兰和南非等地的现有、公开可用的数字化数据集。所有单位均转换为公顷（ha）以表示收获面积，吨（tonnes）以表示产量，以及吨/公顷（tonnes/ha）以表示产量率。小麦蒲式耳转换为吨的换算比率为1/36.744，玉米蒲式耳转换为吨的换算比率为1/39.368。在所有情况下，数据集中报告的Harvest_year均为作物的收获年份。