![]() Historically fertilization came from natural or organic sources: compost, animal manure, human manure, harvested minerals, crop rotations and byproducts of human-nature industries (i.e. Farmers applying these fertilizers in a variety of ways: through dry or pelletized or liquid application processes, using large agricultural equipment or hand-tool methods. For most modern agricultural practices, fertilization focuses on three main macro nutrients: Nitrogen (N), Phosphorus (P), and Potassium (K) with occasional addition of supplements like rock dust for micronutrients. Many sources of fertilizer exist, both natural and industrially produced. Fertilizers may be distinct from liming materials or other non-nutrient soil amendments. A farmer spreading manure to improve soil fertilityĪ fertilizer ( American English) or fertiliser ( British English see spelling differences) is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. ![]()
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