02178naa a2200265 a 450000100080000000500110000800800410001910000200006024501100008026000090019050001360019952012670033565000160160265000180161865000170163665300160165365300120166965300340168170000240171570000210173970000200176070000220178070000200180277300900182211117432018-08-28       2004    bl uuuu     u00u1 u    #d1 aCANELLAS, L. P.  aPhosphorus analysis in soil under herbaceous perennial leguminous cover by nuclear magnetic spectroscopy.  c2004  aTítulo em português: Análise de fósforo em solo com leguminosas herbáceas perenes por meio de ressonância magnética nuclear.  aThe availability and the reserves of organic phosphorus are controlled by its mineralization rate and are also influenced by changes in soil management. The objective of this study was to evaluate the influence of soil covering with different leguminous plant on soil organic P by 31P-NMR spectroscopy. Alkaline soil extracts were obtained from two depths (0-5 and 5-10 cm) of an Ultisol cultivated with herbaceous perennial leguminous plants (Arachis pintoi, Pueraria phaseoloides, Macroptilium atropurpureum). In an adjacent area, samples of the same soil cover with a secondary tropical forest and grass (Panicum maximum) were also collected. The leguminous management was divided into with removal and without removal of shoot parts after cut on soil surface. Phosphate monoesters are the dominant P species in all soil samples and P diesters accumulated on the superficial layer of secondary forest soil. The P amount of this fraction is higher for the legume covered soil when compared with the grass covered soil. The permanence of leguminous plants on the topsoil after the cut promoted an increase in P diester/P monoester ratios. These findings can be accounted for an enhancement of P availability to plants in soils cultivated with leguminous plants.  acover crops  adeforestation  aDesmatamento  acultivation  acultivo  aculturas de cobertura do solo1 aESPINDOLA, J. A. A.1 aGUERRA, J. G. M.1 aTEIXEIRA, M. G.1 aVELLOSO, A. C. X.1 aRUMJANEK, V. M.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 39, n. 6, p. 589-596, junho 2004