Phosphorus fractions in apple orchards in southern Brazil

ABSTRACT: Phosphorus (P) applications at dosages higher than the necessary may cause P buildup in the soil labile fractions and, consequently, pollution of water sources. This study aimed to assess accumulation of P fractions as well as the parameters of adsorption isotherms in soil profiles having a history of application of phosphate fertilizers and cultivated with apple trees. Soil samples were collected from an area with no history of cultivation and 2 apple orchards cultivated for 8 (P8) and 18 (P18) years, in the city of Urubici, Santa Catarina, southern Brazil. Soil samples were air dried, sieved in a 2-mm mesh, and subjected to chemical analyses (P adsorption) besides P chemical SOIL AND PLANT NUTRITION - Article Phosphorus fractions in apple orchards in southern Brazil Djalma Eugenio Schmitt 1 , Gustavo Brunetto 2 *, Elaine dos Santos 3 , Winicius de Lima Wagner 3 , Paula Beatriz Sete 4 , Monique Souza , Vitor Gabriel Ambrosini 5 , Matheus Ademir dos Santos 3 , Tales Tiecher 2

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