Any of a large number of natural and synthetic materials, including manure and nitrogen, phosphorus, and potassium compounds, spread on or worked into soil to increase its capacity to support plant growth.
Qualsevol d'un gran nombre de materials naturals i sintètiques, incloent-hi fems i nitrogen, fòsfor i compostos de potassi, difondre o treballat en terra per augmentar la seva capacitat per donar suport el creixement de les plantes.