00726naa a2200157 a 450000100080000000500110000800800410001902400660006010000140012624501040014026000090024452002260025365000090047970000170048877300630050521200082020-02-07       1990    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.2134/agronj1990.00021962008200020027x2DOI1 aSMYTH, T.  aCritical phosphorus levels for corn and cowpea in a Brazilian Amazon Oxisol.h[electronic resource]  c1990  aPhosphorus soil test interpretations in the Brazilian Amazon currently do not account for differences in P requirements among crops and lack information on the changes in available soil P per unit of applied fertilizer P.  aCorn1 aCRAVO, M. S.  tAgronomy Journalgv. 82, n. 2, p. 309-312, Mar./Apr. 1990.