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The decision to use a particular type of fertiliser needs to be supported by some understanding of the preferred soil conditions and other requirements of the plants being raised. To grow properly, plants require a broad selection of nutrients. Ideally, these occur naturally and are directly available from soil or compost. The three macro or major nutrients: Nitrogen (N), Phosphorus (P), and Potassium (K), are required in significant quantities. They work together and in combination with other nutrients but each of them has a dominant role in certain aspects of growth and plant development. Nitrogen, for example, is required for shoot and leaf growth. Phosphorus is the most crucial nutrient for developing functional root systems, while the main...