Introduction

Certain properties of soils are described by soil scientists for purposes of understanding how they were formed. What is a typical soil profile and how can soil texture be differentiated?

Soils are classified in a complex taxonomy. What are four common groups of soils important for agriculture and forestry?

The soil environment must provide plants with water, nutrients, and air for the roots. What are the key attributes of the soil that bear on its being able (or not being able) to provide these things?

A dynamic interaction between mineral particles, detritus, and organisms in the soil is most important in developing the soil's key attributes. Describe this dynamic interaction and how it develops these attributes.

Soil degradation is devastating to the future productivity of a landscape. What are the major practices leading to erosion and desertification and what are some ways to combat these harmful processes?

Certain irrigation practices may be nonsustainable. Why? Describe the problems that may develop from irrigation.

To bring about better stewardship of soil resources, soil conservation must be promoted at the level of public policy. Describe some encouraging changes that are taking place in the United States

Individual landholders and herders hold the key to sustainable soil stewardship. What are some steps being taken to promote sustainable agriculture in the developing world?

Dryland ecosystems cover over one third of the land area of Earth. How are these systems defined, and what is their significance?