What are fertilizers?

                      Fertilizers contain some of the essential chemicals that plants need to stay healthy. Nitrogen is one of the most important chemicals, and it is in constant demand from the plant. Nitrogen cannot easily be obtained from the air, except by plants that have organs containing nitrogen-fixing bacteria. Fertilizers used on crops and garden plants usually contain nitrogen, phosphorus, iron, potassium and several other minerals that can boost the plant’s rate of growth.

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