Spectroscopic quantification of soil phosphorus forms by 31P-NMR after nine years of organic or mineral fertilization Quantificação espectroscópica de formas de fósforo do solo por 31p-rnm após nove anos de uso de fertilizantes orgânicos ou minerais

• Main Author: Gatiboni L.C.*
• Publication Date: 2013
• Other Authors: Brunetto G., Rheinheimer D.S., Kaminski J., Pandolfo C.M., Veiga M., Flores A.F.C., Lima M.A.S., Girotto E., Copetti A.C.C.
• Format: Article
• Language: eng
• Source: Repositório Institucional da Udesc
• dARK ID: ark:/33523/001300000k5dq
• Download full: https://repositorio.udesc.br/handle/UDESC/9027

Long-standing applications of mineral fertilizers or types of organic wastes such as manure can cause phosphorus (P) accumulation and changes in the accumulated P forms in the soil. The objective of this research was to evaluate the forms of P accumulated in soils treated with mineral fertilizer or different types of manure in a long-term experiment. Soil was sampled from the 0-5 cm layer of plots fertilized with five different nutrient sources for nine years: 1) control without fertilizer; 2) mineral fertilizer at recommended rates for local conditions; 3) 5 t ha-1 year-1 of moist poultry litter; 4) 60 m3 ha-1 year-1 of liquid cattle manure and 5) 40 m3 ha-1 year-1 of liquid swine manure. The 31P-NMR spectra of soil extracts detected the following P compounds: orthophosphate, pyrophosphate, inositol phosphate, glycerophosphate, and DNA. The use of organic or mineral fertilizer over nine years did not change the soil P forms but influenced their concentration. Fertilization with mineral or organic fertilizers stimulated P accumulation in inorganic forms. Highest inositol phosphate levels were observed after fertilization with any kind of manure and highest organic P concentration in glycerophosphate form in after mineral or no fertilization.