| http://www.w3.org/ns/prov#value | - Organic fertilizers and soil enhancers are used for their organic matter contribution and nutrients, mainly N and P (Fuente et al., 2006) since around 98% N (Castellanos et al., 2000) and 33 to 67% total P (Ortiz y Ortiz, 1990) found in soils are associated with organic matter.
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