01889naa a2200313 a 450000100080000000500110000800800410001902400380006010000170009824501540011526000090026952009440027865000130122265000250123565000180126065000230127865000090130165000080131065000160131870000180133470000160135270000200136870000160138870000160140470000150142070000200143570000220145577300980147719635152016-02-22       2013    bl uuuu     u00u1 u    #d7 a10.1080/00103624.2013.7948192DOI1 aBRUNETTO, G.  aSoil phosphorus fractions in a sandy typic hapludaft as affected by phosphorus fertilization and grapevine cultivation period.h[electronic resource]  c2013  aThe 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.  aFósforo  aFósforo Inorgânico  aFracionamento  aNutrição vegetal  aSolo  aUva  aViticultura1 aLORENSINI, F.1 aCERETTA, A.1 aGATIBONI, L. C.1 aTRENTIN, G.1 aGIROTTO, E.1 aMIOTTO, A.1 aLOURENZI, C. R.1 aMELO, G. W. B. de  tCommunications in Soil Science and Plant Analysis, New Yorkgv. 44, n. 13, p. 1937-1950, 2013