Patricio Grassini, Kent M. Eskridge & Kenneth G. Cassman. “Distinguishing between yield advances and yield plateaus in historical crop production trends.” Nature Communications volume 4, Article number: 2918 (2013)
1970诺贝尔和平奖。他的贡献如下：“Borlaug received his B.S. in forestry in 1937 and Ph.D. in plant pathology and genetics from the University of Minnesota in 1942. He took up an agricultural research position with CIMMYT in Mexico, where he developed semi-dwarf, high-yield, disease-resistant wheatvarieties. During the mid-20th century, Borlaug led the introduction of these high-yielding varieties combined with modern agricultural production techniques to Mexico, Pakistan, and India. As a result, Mexico became a net exporter of wheat by 1963. Between 1965 and 1970, wheat yields nearly doubled in Pakistan and India, greatly improving the food security in those nations. Borlaug was often called "the father of the Green Revolution", and is credited with saving over a billion people worldwide from starvation。”
1. 国家的平均值（美国的数据分区），不是实验田的。
2. 中国的粮食单产1980大增，但还是落后于美，欧（我原来以为美国是大农业，单产不如精耕细作的中国）。
Dr. Borlaug 是绿色革命之父，获1970诺贝尔和平奖。
数据来源： Nature， https://www.nature.com/articles/ncomms3918/figures/5
更多我的博客文章>>> 自绿色革命来，各国粮食单产趋势图。穷人的救星是无产阶级伟大领袖？ 立夏一周了，试图英译杜甫的《江村长夏》及其它
暖→丰收→轻度饥荒→无起义、暖→丰收→中度饥荒→无起义、暖→常年→轻度饥荒→无起义、暖→常年→中度饥荒→无起义。
我存疑，气候好-丰收-人口多-饥荒，这条链不导致起义。也许difference is冷造成的歉收是饥寒交迫。
China 6081 kg/hectare
USA 8692
North America 7644
Netherlands 8318
France 6885
UK 6789
Germany 6220
Euro zone 5515
New Zealand 8064
Egypt 7149
Korea 6585
Japan 5919
India 3248
Latin America 4374
East Asia & Pacific 5130
Arab World 2011
World 4071
https://data.worldbank.org/indicator/AG.YLD.CREL.KG
Patricio Grassini, Kent M. Eskridge & Kenneth G. Cassman. “Distinguishing between yield advances and yield plateaus in historical crop production trends.” Nature Communications volume 4, Article number: 2918 (2013)
1。穷人的救星确实是无产阶级领袖。
2. 关于美国单产和中国单产的问题：
美国出口粮食占世界出口的的26%，按人均消耗500公斤粮食算，可养活3亿人口，所以美国产粮食可养活6亿多人。
中国人均粮食470公斤，养活14亿人口，95%自给率，大概进口主粮5%。可以自给100%，但是进口更便宜，所以少量进口主粮。副粮主要进口，因为大豆亩产仅300公斤，进口更合算。
美国耕地面积耕地面积世界第一，耕地条件好，一望无际大平原，沃野千里，水源充足。由于美国轮换休耕制，所以美国粮食总产量远远没有中国的高。还由于美国的科技农业，机械化作业，所以美国单产产量高不足为奇。
中国耕地自然条件是比较差的，长江中下游平原条件最好，东北大平原条件很好，但是寒冷，只能一季。华北平原，黄土高原干旱，产量低。云贵川桂群山峻岭，耕地少，坡陡地，小块地，山遮阳地。浙赣闽粤多山少地。中国能够单产这么高主要是中国人勤劳，土里刨食，几千年来在温饱线上挣扎。
1970诺贝尔和平奖。他的贡献如下：“Borlaug received his B.S. in forestry in 1937 and Ph.D. in plant pathology and genetics from the University of Minnesota in 1942. He took up an agricultural research position with CIMMYT in Mexico, where he developed semi-dwarf, high-yield, disease-resistant wheat varieties. During the mid-20th century, Borlaug led the introduction of these high-yielding varieties combined with modern agricultural production techniques to Mexico, Pakistan, and India. As a result, Mexico became a net exporter of wheat by 1963. Between 1965 and 1970, wheat yields nearly doubled in Pakistan and India, greatly improving the food security in those nations. Borlaug was often called "the father of the Green Revolution", and is credited with saving over a billion people worldwide from starvation。”
人家低，单位化肥农药用量又翻倍地高于人家，说明什么？光靠一两个种子是搞不定的吧？而且这与地形关系也不大吧？讲机械化已经out了，要智能化，用化肥农药要像外科手术一样的精准。
60多岁的人了，不知道你在说什么，回我的帖吗？