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Phosphorus fractions in sandy soils of vineyards in souther..:

Djalma Eugênio Schmitt ; Jucinei José Comin ; Luciano Colpo Gatiboni...
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200018&lng=en&tlng=en.  , 2013