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 Inorganic
Fertilizers
Organic Fertilizers/Manures
Bio-Fertilizers
Methods of Applying Fertilizer
Soil Testing
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Introduction:
Fertilizer is generally defined as "any material, organic or inorganic,
natural or synthetic, which supplies one or more of the chemical elements
required for normal growth and development of plants. Sixteen elements
listed in Table 1 are identified as essential elements for plant growth, of
which nine are required in macro quantities and seven in micro quantities.
Of the elements listed in Table 1, carbon, oxygen and hydrogen are supplies
by air and water and are, therefore, not treated as nutrients by the
fertilizer industry. The main aim of the industry is to provide the primary
and secondary nutrients which are required in macro quantities.
Azolla -
a Potential Bio-fertilizer..
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