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In the countries of the Third World, some 2.3-2.6 billion people are supported b
y agricultural systems characterized by modern technologies brought about by the
Green Revolution. These systems utilize good soils and usually have reliable ac
cess to water, and are close to the roads, markets and supplies of inputs. Howev
er, these systems are not applicable to the 1.9-2.2 billion people living in rai
n-fed, undulating and mountainous areas, which are largely untouched by modern t
echnology. They tend to be in the poorer countries with little foreign exchange
to buy external inputs. Their agricultural systems are complex and diverse, and
are located in the humid and semi-humid lowlands, the hills and mountains, and t
he drylands of uncertain rainfall. They are remote from services and roads, and
they commonly produce per unit area only one-fifth to one-tenth of the food as f
arms in the industrialized and Green Revolution land

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