© T. M. Whitmore TODAY “The Green Revolution” continued.
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Transcript of © T. M. Whitmore TODAY “The Green Revolution” continued.
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© T. M. Whitmore
TODAY• “The Green Revolution” continued
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© T. M. Whitmore
LAST TIME• The Fertilizer Revolution
Late 18th thru early 20th centuryCoincident with the development of
chemistry generally
• “The Green Revolution”
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© T. M. Whitmore
How does it work? • The “green revolution” consists of several
things — “the package” 1) Dwarf, high yielding hybrid seeds (HYV)2) Irrigation3) Fertilizer4) Herbicides and pesticides 5) Often uses agricultural machinery
• Lacking the “package”: yields/ha are often NO better than traditional
• Infrastructure: (roads, markets, banking and finance, rural credit, agricultural extension, research capacity, national integration and policy making) necessary to develop and sustain the technological package
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© T. M. Whitmore
Changes in an Punjab (India) village 1960s-1970s
• Changes are not just increases in output – the proportion of crops sown changesWheat:
yields up 2x as HYV monocrop increased proportion of village land
Rice yields increase 1970s as HYV
monocrop none planted in 1960s
Maize yields up as HYV monocrop increased proportion of village
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© T. M. Whitmore
Changes in crops (continued)• Changes are not just increases in output –
the proportion of crops sown changes Cotton
little change in yield decreased proportion of village
Cane sugar little change in yield decreased proportion of village
Bersim (a form of clover) legume/fodder crop for rotations little change in yield decreased proportion of village
(stubble of maize/wheat used as fodder)
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© T. M. Whitmore
Changes in technology• Technology
Irrigation: increased for winter cropping; better tube wells and mechanical pumps; worth it with higher yields
Soil amendments: increased chemical inputs for rice, wheat, maize; decreased intercropping and rotation
Tools of cultivation: hand tools and oxen plows still; add some rental tractors
Transport: ox carts & bicycles only before; better ox carts, motorbikes, some trucks
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© T. M. Whitmore
Changes in technology (continued)
• Use and type of animalsDecrease in cattle (traction)Increase in buffalo (traction AND milk for
local use and sale)
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© J. Jangoux
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© M. Meade © M. Meade
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© M. Meade
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© T. M. Whitmore
Social Changes• Human populations
Total numbers grewProportions in upper classes lower
moved out or now manage larger farms; teach;
etc.Proportions in landless lower classes
increased now wage labor
• Tenurenumber of holdings decreased - size of
some increased
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© M. Meade
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© T. M. Whitmore
Social Changes (continued)• Public works
Improved roadsImproved templeLocal secondary school built
• Interconnectivity/dependenceRather self sufficient beforeNow reliant on
Capital (loans) Purchased inputs Petroleum Markets
• NOT clear that even though total output increased - wellbeing did for everyone
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© M. Meade
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© T. M. Whitmore
Problems & Successes – critics and apologists
• SuccessesImproved productivity 3-6 times as much
per hectareFar lower prices for main grain crops
world wideLower rates of extensification world wideVastly increased food productionLower proportions of hunger and lower
absolute numbers
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0
1
2
3
4
5
Yiel
d (m
etric
tons
/hec
tare
)
1960 1965 1970 1975 1980 1985 1990 1995 2000
Wheat Yield Rice Yield Maize Yield
Yields Are Up, But Growth is Slowing
World Resources Institute
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© T. M. Whitmore
Problems & Successes continued
• Problems with the technology itselfChemical pollution
runoff can enter water tables and poison local water sources
individual farmers often have very little knowledge of risks using pesticides especially — thus compromising their health
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© T. M. Whitmore
• Problems with the technology itselfSoil damage
chemicals, especial herbicides and other organic killers, can also kill micro organisms within the soils
very “tight” spacing of crops in the field lead to large demands on the soils for nutrients
tight spacing and mechanization can lead to soil compaction
Erosion & salinization
Problems & Successes continued
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© T. M. Whitmore
Problems & Successes continued
• Uneven geographic and crop-specific impacts Little improvement in pulses and rootsLittle improvement in crops that are
mostly dry land (barley, millets, and sorghums
Late getting to Africa and Mid East Most growth 1960s-70s in Africa due to
extensificationMost growth in output 1980s - due to
increased inputs not HYVs per se Most benefits to Asia and LA
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Progress in Feeding the World Has Varied Progress in Feeding the World Has Varied Widely by RegionWidely by Region
80
100
120
140
160
180
1961 1966 1971 1976 1981 1986 1991 1996
Inde
x Nu
mbe
rs 1
961=
100
U.S.S.R. (former) AfricaAsia EuropeWorld Latin America
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© T. M. Whitmore
Problems & Successes continued
• Impacts on large and small holdersDifficult for poor to afford the “package”Benefits of improved output mostly to
the already relatively better off
• Other criticisms Genetic lossPetroleum dependence (fertilizer)Dependence on irrigationDoes not “solve” the food problem
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Food Supply Increasingly Relies on Irrigation
0
2
4
6
8
10
12
1961 1966 1971 1976 1981 1986 1991
(per
cent
)
Africa Asia Latin America Europe
North America Oceania World
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0
20
40
60
80
100
120
140
160
1961 1966 1971 1976 1981 1986 1991
(mill
ion
met
ric to
ns)
AfricaAsiaSouth and Central AmericaEuropeNorth AmericaOceaniaWorld
More fertilizer: More food, but more pollution
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