Sustaining the increase in crop production is the basic cornerstone of meeting
the rising demands from population growth, changing dietary preferences and
expanding biofuels use. The earlier strategy was simply to expand the area
devoted to crop production. However, expanding the area for crop production
is now limited and often associated with environmental concerns since it always
involves the clearing of natural ecosystems, forests, and other fragile ecosystems.
This has shifted to strategy such as the intensification of the crop yields of existing