Effectiveness of Extractants for Bioavailable Phosphorus in Tropical Soils Amended with Sewage Sludge

• Published in: Applied and Environmental Soil Science Vol. 2015; no. 2015; pp. 193 - 200
• Main Authors: Alleoni, Luís Reynaldo Ferracciú, Bertoncini, Edna Ivani, Melo, Wanderley José de, Nogueirol, Roberta Corrêa
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Limiteds 2015; Hindawi Publishing Corporation; John Wiley & Sons, Inc; Hindawi Limited
• Subjects: Cereal crops; Chemical properties; Colorimetry; Corn; Environmental aspects; Leaves; Micronutrients; Organic phosphorus; Phosphorus content; Plant-soil relationships; Saccharum; Sewage sludge; Sludge; Soil sciences; Soils; Sugarcane; Sulfuric acid; Tropical environments; Zea mays
• ISSN: 1687-7667; 1687-7675
• DOI: 10.1155/2015/720167

Urban wastes such as sewage sludge can be an economically viable alternative source for providing macro- and micronutrients to plants in tropical conditions. Sewage sludge is normally rich in phosphorus (P), which is present in soils mainly in organic forms, so that it is very important to establish methods for estimating its availability to plants. This study aimed to test three extractants that simulate P-uptake by maize (Zea mays) cropped in plots after 13 consecutive years of fertilization with sewage sludge, in a cycle of fertilized sugarcane (Saccharum L.) amended with sewage sludge and organic compost. Soil samples were collected at depths of 0–10, 10–20, and 20–40 cm in March 2010 from the two experimental areas. Soil P was extracted via ion exchange resin, Mehlich-I, and 0.025 M H2SO4 and determined via colorimetry. Maize and sugarcane diagnostic leaves were collected in the experiments, subjected to nitric-perchloric digestion, and the leaf-P content was determined via colorimetry. No significant correlations were found between phosphorus extracted from soils and phosphorus concentrations in diagnostic leaves. Resin extracted larger amounts of P in the short-term experiment, while acidic extractants yielded larger amounts in the long-term experiment.