Fertilizers are what we
use to distribute nutrients into the root zone of
plants. Technically, they are NOT PLANT FOOD since
plants make their own food through a process called
photosynthesis. Fertilizers merely provide the nutrients
that are used as the building blocks of carbohydrates
and sugars in the plant. Unless they are present along
with the proper temperature, water, light and
chlorophyll levels, growth will not occur.
Generally, the home
gardener is concerned with three major factors when it
comes to fertilizers:
1.
Nutrient Levels - By
law, all fertilizers must have a listing of the
amounts of various nutrients to found in them. At a
minimum, the label must contain the percentages of
nitrogen
(N) -
phosphorus (P in the form of phosphate) -
potassium
(K in the form of phosphate). Based on the needs of
the particular plants or on the results of a
soil test, the amount of each nutrient needed may
determine the fertilizer selected.
In addition to the
three major nutrients, fertilizer containers will
show the percentage of minor nutrients that might be
available. For instance, a container of ammonium
sulfate fertilizer will have an analysis of 21-0-0
but the label will also give the percentage of
sulfur included.
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