A fertilizer is any material, it can
be organic or inorganic, it can be natural or synthetic, which supplies plants
with the necessary nutrients needed for plant growth and optimum yield. Organic
fertilizers are natural materials of either plant or animal origin, including
livestock manure, green manures, crop residues, household waste, compost, and
woodland litter. Inorganic (or mineral) fertilizers are fertilizers that are mined
from mineral deposits with little processes (e.g., lime, potash, or phosphate
rock), or industrially manufactured through chemical processes (e.g., urea).
Inorganic fertilizers vary in appearance depending on the process of the
manufacturer.
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