The Boron (B), Copper (Cu), Iron (Fe), Chloride

The nutrient
cycle describes how nutrients move from the physical environment into living
organisms, and subsequently are recycled back to the physical environment. This
movement of nutrients, essential for life, from the environment into plants and
animals and back again, is a vital function of the ecology of any region. In
any particular environment, the nutrient cycle must be balanced and stable if
the organisms that live in that environment are to flourish and be maintained
in a constant population. Currently, large parts of humankind influence the
nutrient cycle in such a way that we remove nutrients from the land and
discharge them into aquatic environments. On the one hand, this leads to soil
depletion on the land, and on the other hand, an overabundance of nutrients and
pollution of water sources.

Nutrients are
chemical elements that all plants and animals require for growth. On the earth,
there is a constant and natural cycle how these elements are incorporated when
an organism grows, and degraded if an organism dies. The nutrients used
in the largest amounts are the non-mineral elements, i.e. carbon (C), hydrogen
(H) and oxygen (O). These elements are mainly taken up as carbon dioxide (CO2)
from the air, and water (H2O) by the roots. They make up 95-98% of the mass of
all living beings. But they are, however, not sufficient for life to exist.
Further elements are important to fuel life on earth: Nitrogen (N)and Phosphorus (P), Potassium (K)
as well as Calcium (Ca) and Magnesium (Mg) are highly important, in particular
for plant growth and agriculture. These elements are often referred to as
macro nutrients. Their uptake is about 100 times that of micro nutrients.
Further nutrients, that plants take up in a much smaller amount and that
are essentially consumed by humans, include Boron (B), Copper (Cu), Iron (Fe),
Chloride (Cl), Manganese (Mn), Molybdenum (Mo) and Zinc (Zn) and others. These are called
micro nutrients.

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These nutrients –
essentially chemical elements – are continuously in a circular movement,
the nutrient cycle. The nutrient cycle is hence a general
term that describes how nutrients move from the physical environment
into living organisms, and are subsequently recycled back to the physical environment. Nutrients in
the soil are taken up by plants, which are consumed by humans or animals, and
excreted again by them — or they are released back into the environment when
organisms die (e.g. plants lose their leaves). Microorganisms in the
soil break this matter down, and again make nutrients available in
their mineral form, which makes it possible for plants to take them up again .