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A chemical element with the symbol N. Nitrogen is a macronutrient, that - along with oxygen, carbon and hydrogen - is essential for plant growth.

The bacteria on the roots of leguminous vegetables, or the micro-organisms found in soil, which convert atmospheric nitrogen into nitrogen compounds that can be used by plants.

The result of a chemical process by which nitrogen in plant and animal waste is oxidised by soil bacteria. It first changes into nitrites, then into nitrates, which can be absorbed by plant roots. Nitrate of soda is an alkaline fertiliser that

Knobbly growth arising from the roots of leguminous plants. The root nodules contain bacteria used in nitrogen fixation.

Any substance, organic or inorganic, used to increase soil nutrients. It can be straight, containing only one nutrient, such as nitrogen; or compound, containing more than one nutrient; or balanced, containing equal quantities of plant nutrients.