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There are a lot of different types of fertilizer, because different plants need different types of nutrients.

Most but not all fertilizers contain nitrogen. Nitrogen-rich fertilizer comes mainly from animal urine and feces. Fish-based fertilizers also contain a lot of nitrogen and other valuable nutrients for plants. Nitrogen helps to keep a plant green.

Some fertilizers have phosphorous. Phosphorous type fertilizer comes from ground-up animal bones from slaughterhouses.

Iron-rich fertilizer may have dried animal blood that came from slaughterhouses. Iron is used for plants when there is an abnormal yellowing in the foliage (a sure sign of iron deficiency in plants).

Fertilizers help plants because they replace the nutrients in the soil that the plant has already taken out and used.

Somtimes they use animal poo.

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13y ago

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