00835naa a2200217 a 450000100080000000500110000800800410001910000180006024501220007826000090020052002400020965000160044965000130046565000170047865000090049565300190050465300100052370000190053370000210055277300440057320119942015-03-24       1964    bl ---       0--  u    #d1 aDAHNKE, W. C.  aPhosphorus fractions in selected soil profiles of El salvador as related to their development.h[electronic resource]  c1964  aThe first soil survey of El Salvador (1) was published in 1946. This was a broad reconnaissance survey and made no attempt to define series or to establish relationships among the broader soil groups by means of laboratory examination.  aEl Salvador  aFósforo  aLevantamento  aSolo  aFertilização  aSolos1 aMALCOLM, J. L.1 aMENÉNDEZ, M. E.  tSoil Sci.gv. 98, n. 1, p. 33-38, 1964.