HORTICULTURE

Weathered Minerals

Imagine a cross-sectional slice made down into the earth’s crust (Figure 3-1). This is called a soil profile. The mineral content of soil results from the weathering of solid bedrock or other parent material over long periods of time. The solid rock is acted on by an assortment of natural forces including temperature alternations that crack the rock, water that freezes within the cracks, and plant roots that further pry

Weathered Minerals

figure 3-1. A soil profile (Delmar/Cengage Learning)

the cracks open. Then follows abrasive grinding by wind, water, and sometimes ice. Lichens and microbes may produce organic acids that react with the rock to further weaken it. While the weathering of parent material takes place over eons of geological time, it is nonetheless a simple breakdown of large pieces of rock into smaller particles.

HORTICULTURE

Selecting the Correct Lighting

In summary, no single recipe for correct lighting can be given. There will be varied settings, needs, and objectives to accommodate. Plants will seldom be the only consideration in the …

Natural Light

Most important of all light sources for interior plantscapes is natural sunlight when it can be planned for and depended on. Each footcandle of illumination that nature provides is one …

Light Quality

Once acclimatized to the reduced light intensity of the interior, the plantscape may still prove unsatisfactory if the light quality is incorrect. Light quality is the color of light emitted …

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