As such, not all have been assessed for their effects on soil, water, and air quality.

The starting point must be deep enough to intercept the expected flow of soil water, usually at least 12 to 18 inches.

The proposal, he said, would establish acceptable levels for chemical contaminants in soil, ground water and building interiors.

A concentration gradient is established between the root and the soil water.

If stated, water potential is comparatively positive in the soil water.

Buckingham then work on soil water, research for which he is now renowned.

It can be cultured from soil, water, and air samples.

When insufficient soil water is available, a water-stressed condition occurs.

In cultivation, the plants prefer light well-drained soil, not too rich and adequate water.

To measure the effects of air pollution alone, she controlled most other conditions - soil, light, water and genetic composition.