01297naa a2200193 a 450000100080000000500110000800800410001910000150006024500950007526000090017052007540017965000250093365000090095865000130096765000090098065300190098970000180100877300770102613658682012-03-12       1943    bl ---       0--  u    #d1 aSTELLY, M.  aForms of inorganic phosphorus in the C horizons of some IOWA soils.h[electronic resource]  c1943  aThe C horizons of many Iowa soils derived from loess contain several hundred parts per million of dilute acid-soluble phosphorus (13). In spite of this high solubility, the phosphorus in some of these soils has a low avaliability to such plants as corn and sudan grass, althought in general a fair avaliability to alfafa. In the C horizon of other soils, however, the phosphorus has a high avaliability to all these crops even when the amount of dilute acid soluble phosphorus is considerably less (16). In view of these rresults it seemed desirable to undertake a study of the forms of phosphorus present in the C horizon of these soils. This was done largely by comparing the phosphorus solubility of various naturally occuring phosphate minerals.  ainorganic phosphorus  asoil  aFósforo  aSolo  aFertilização1 aPIERRE, W. H.  tProceedings of Soil Science Society of Americangv. 7, p. 139-147, 1943.