Agroecology : researching the ecological basis for sustainable agriculture / Stephen R. Gliessman -- Two examples of natural enemy augmentation : a consequence of crop diversification / Deborah K. Letourneau -- An evaluation of ants as possible candidates for biological control in tropical annual agroecosystems / C. Ronald Carroll and Stephen Risch -- Cropping systems, insect movement, and the spread of insect-transmitted diseases in crops / Alison G. Power -- Diversification of agroecosystems for insect pest regulation : experiments with collards / Miguel A. Altieri, David L. Glaser, and Linda L. Schmidt -- Reduction of damping-off disease in soils from indigenous Mexican agroecosystems / R.D. Lumsden [and others] -- The role of allelopathy in agroecosystems : studies from tropical Taiwan / Chang-Hung Chou. Nutrient mobility in a shifting cultivation system, Belize, Central America / J.D.H. Lambert, D. Brubacher, and J.T. Arnason -- Low-input ideotypes / M.J.J. Janssens, I.F. Neumann, and L. Froidevaux -- An ecological approach to reducing external inputs through the use of intercropping / M.F. Amador and Stephen R. Gliessman -- Integrating trees into agriculture : the home garden agroecosystem as an example of agroforestry in the tropics / Stephen R. Gliessman -- The influence of trees in selected agroecosystems in Mexico / John Farrell -- Tree improvement from the ground up : the potential for a select microbial inocula in forestry / Tim Wood and Wm. Hugh Bollinger -- Variability, stability, and risk in intercropping : some theoretical explorations / John Vandermeer and Brian Schultz. Reducing the risk : some indications regarding pre-Hispanic wetland agricultural intensification from contemporary use of a wetland/terra firma boundary zone in Central Veracruz / Alfred H. Siemens -- Agricultural systems of the northeastern hill region of India / P.S. Ramakrishnan -- The impact of agrohydrological management on water, nutrients, and fertilizers in the environment of the Netherlands / J.G. de Molenaar -- Technological changes in energy use in U.S. agricultural production / David Pimentel, Wen Dazhong, and Mario Giampietro -- Energy flow in agroecosystems of northeast China / Wen Dazhong and David Pimentel -- Threats to sustainability in intensified agricultural systems : analysis and implications for management / B.R. Trenbath, G.R. Conway, and I.A. Craig -- Quantifying the agroecological component of sustainable agriculture : a goal / Stephen R. Gliessman.