Green Composites from Natural Resources

172 Green Composites from Natural Resources

soil. Herbicides and insecticides may inadvertently affect benecial organisms (e.g.,

plants with nitrogen-xing nodules on the roots or microorganisms).

Zwerman and De Haan (1973) reviewed the signicance of the soil in environ-

mental quality improvement outlining the plant and animal ecology and the impact

of agriculture and industry upon them. They discussed remedial measures necessary

to maintain and/or improve this environment. They stated that data exist to show

that overfertilization actually decreases crop yield under a wide range of conditions.

O’Sullivan and Simota (1995) reviewed the problems of combining soil compac-

tion models with crop production and environmental impact models. Håkansson ...