The world's population is expected to reach 8 billion by 2025 and most
of this growth in population will occur in developing countries. To feed
the world with such a marked increase in population, a great improvement
in food production must be achieved particularly in these countries. To
meet this challenge, present agricultural productivity must be increased
on the cultivated land. However, in many developing countries,
particularly in Africa, reduced soil fertility caused by continuous
cropping with low nutrient input and the resultant nutrient mining of
soils is a major threat both to food production and to ecosystem
viability. As a result of declining soil fertility, together with
increasing population pressure, expansion of crop production to marginal
lands and forested areas contribute to the destruction of natural
ecosystems. Food production is not only a quantitative challenge.
Improving the nutrient status of plants provides a further valuable
means of enhancing food quality and is of extreme benefit to the health
of both plants and humans. There are several excellent examples showing
that plants with optimum nutrient status are better adapted to biotic
and abiotic stress factors. Because of population pressures, many global
food systems are not currently providing enough micronutrients to ensure
adequate micronutrient intakes in the human diet. This has resulted in
an increasing prevalence of micronutrient deficiencies that now afflicts
over three billion people worldwide.