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Soil Phosphorus Fractions in a Sandy Typic Hapludaft as Affected by Phosphorus Fertilization and Grapevine Cultivation Period

2013; Taylor & Francis; Volume: 44; Issue: 13 Linguagem: Inglês

10.1080/00103624.2013.794819

1532-2416

Gustavo Brunetto, Felipe Lorensini, Carlos Alberto Ceretta, Luciano Colpo Gatiboni, Gustavo Trentin, Eduardo Girotto, Alcione Miotto, Cledimar Rogério Lourenzi, George Wellington de Melo,

Soil Management and Crop Yield

Abstract The purpose of this study was to quantify the phosphorus (P) fractions in phosphate-fertilized sandy soils under grapevines. Soil was sampled from a grassland site and two vineyards (13 and 31 years old) in the State Rio Grande do Sul, Brazil, from the layers 0–5, 5–10, 10–15, 15–20, and 20–40 cm deep. The samples were prepared and P fractions were assessed by chemical fractionation. Phosphate fertilization of the vineyard soils increased P contents to a depth of 40 cm, especially in the more recalcitrant fractions but detectable in the more labile fractions as well, which are plant available and may increase the risk of environmental contamination. Phosphate fertilizers and the period of grapevine cultivation had little effect on the levels of organic P forms, whereas cover crops in vineyards could be an appropriate strategy to increase or maintain the levels of soil organic matter and the levels of organic P over the years. Keywords: Chemical phosphorus fractionationinorganic phosphorusorganic phosphorus Vitis vinifera Acknowledgments The authors are indebted to the National Council for Scientific and Technological Development (CNPq) for the financial support (Edital MCT/CNPq No. 014/2010, Universal). The authors thank the undergraduate students Tadeu Luis Tiecher and Lessandro De Conti for all their help with the laboratory work.