ABSTRACT
Acknowledgments ..................................................................................................................... 653
References ................................................................................................................................... 653
A prime objective of agriculture in the coming decades must be to optimize soil
productivity while preserving the capacity of soils to function as healthy systems. This
is particularly important for the stressed soils that are so abundant in most developing
countries. Increasing productivity in perpetuity without inducing any associated
ecological or social ill-effects — achieving what M.S. Swaminathan has called the “ever-
green revolution” (Swaminathan, 1996) — is imperative if we are to reduce poverty and
hunger without worsening people’s current living conditions and future prospects. In this
move towards more sustainable agricultural practices, the use of biological inputs will
play a key role in the maintenance of soil fertility and in increasing crop production.