Plants feed on substances found in the
soil, but over time the floor nutrients
in the soil are depleted, and we need
to use fertilizer to replace them.
Organic fertilizer is a natural product obtained
from the decomposition of plant and animal
matter. Organic fertilizer can make the soil
more fertile. There are a number of different
organic fertilizers, including compost,
vermicast (worm humus), and manure.
3. The importance of fertilizer
3.1 Organic fertilizer
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