Hydroponics, the science of growing
plants, in water or inert substances, represents one of the most innovative
practices in modern agricultural development. Not only does it allow greater of
the plant growth process, it permits the production of crops in hostile
infertile environments.
The first widely publicized soilless
gardening experiments were conducted during the 1930s. W. F. Gericke varied
nutrient levels among specimens suspended in a gravel substrate (沙砾基质) to
demonstrate remarkable alterations in growth. Among the findings that amazed his
fellow horticulturists was the production of tomato plants over 6 meters
high.
The original hydroponics gardens merely consisted of
plants floating in water. It was later discovered that the roots
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In the United States, the need to
protect plant and animal species has become a highly controversial and sharply
political issue since the passage of the Endangered Species Act in 1973. The
act, designed to protect species’ living areas, and policies that preserve land
and forests compete with economic interests. In the 1990’s, for example, the
woodcutters in the Western United States were challenged legally in their
attempt to cut trees for timber in the Cascade Mountains. The challenge was
mounted to protect the endangered spotted owl(猫头鹰), whose remaining population
occupies these forests and requires the intact, ancient forest for survival. The
problematic situation set the interests of environmentalists against those of
corporations and of individua
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