1703334042
1703334043
48.Alcantara, 1973, 25.
1703334044
1703334045
49.农业活动咨询委员会，1951，4，在Brinkmann, 2009，5中引用。
1703334046
1703334047
50.Gaud, 1968.
1703334048
1703334049
51.Dubin and Brennan, 2009, 21.
1703334050
1703334051
52.统计总局，1955, 13–16.
1703334052
1703334053
53.Patel, 2013.
1703334054
1703334055
54.Ibid.
1703334056
1703334057
55.依据Cochrane, 1979, 128; EPI, 2012, 2013, 2014计算。
1703334058
1703334059
56.Moore, 2010c.
1703334060
1703334061
57.依据Fuglie and Wang, 2012, 2; Grantham, 2011计算。
1703334062
1703334063
58.参见：FAOSTAT database at www.fao.org/faostat/en/#home。
1703334064
1703334065
59.Rosset, 2000.
1703334066
1703334067
60.Specter, 2014.
1703334068
1703334069
61.Tiwana et al., 2009.
1703334070
1703334071
62.Kumar and Kumar, 2016, 3.
1703334072
1703334073
63.Wiggins and Keats, 2015.
1703334074
1703334075
64.V. Miller et al., 2016.
1703334076
1703334077
65.Patel, 2007, ch 3.
1703334078
1703334079
66.McMichael, 2009.
1703334080
1703334081
67.Patel et al., 2014, 22.
1703334082
1703334083
68.Weis, 2013, 1–2.
1703334084
1703334085
69.Ibid., 126.
1703334086
1703334087
70.Cronon, 1991.
1703334088
1703334089
71.PennState Extension, 2015.
1703334090
1703334091
72.EPA, 2012.
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