title: Recycling of solid waste rich in organic nitrogen from leather industry: mineral nutrition of rice plants.
abstract: The leather industry produces a large quantity of solid waste (wet blue leather), which contains a high amount of chromium. After its removal from wet blue leather, a solid collagenic material is recovered, containing high nitrogen levels, which can be used as a nitrogen source in agriculture. In order to take more advantage of the collagen, it was enriched with mineral P and K in order to produce NPK formulations. The objective was also to evaluate the efficiency of such formulations as a nutrient supply for rice plants in an Oxisoil, under greenhouse conditions. The application of PK enriched-collagen formulations resulted in N contents in the vegetative parts and grains of rice plants which were equivalent or superior to those obtained with urea and commercial NPK formulations.
authors.affiliation: Departamento de Química, Universidade Federal de Lavras, Caixa Postal 3037, CEP 37200-000, Lavras, MG, Brazil.
authors.forename: Francisco G E
authors.initials: FG
authors.lastname: Nogueira
authors.forename: Isabela A
authors.initials: IA
authors.lastname: Castro
authors.forename: Ana R R
authors.initials: AR
authors.lastname: Bastos
authors.forename: Guilherme A
authors.initials: GA
authors.lastname: Souza
authors.forename: Janice G
authors.initials: JG
authors.lastname: de Carvalho
authors.forename: Luiz C A
authors.initials: LC
authors.lastname: Oliveira
mesh_terms: D002857:Chromium / Q000737:chemistry; D003094:Collagen; D005308:Fertilizers; D007220:Industrial Waste; D008855:Microscopy, Electron, Scanning; D008903:Minerals / Q000378:metabolism*; D009584:Nitrogen / Q000032:analysis*; D009747:Nutritional Physiological Phenomena; D012275:Oryza / Q000254:growth & development / Q000502:physiology*; D010758:Phosphorus / Q000737:chemistry; D018520:Plant Shoots / Q000254:growth & development / Q000502:physiology; D011188:Potassium / Q000737:chemistry; D059027:Recycling / Q000379:methods*; D012037:Refuse Disposal / Q000379:methods*; D013633:Tanning
chemical_list: D005308:Fertilizers; D007220:Industrial Waste; D008903:Minerals; D002857:Chromium; D010758:Phosphorus; D003094:Collagen; D009584:Nitrogen; D011188:Potassium