01630nam a2200277 a 450000100080000000500110000800800410001910000300006024501150009026001080020530000160031352007260032965000210105565000090107665300280108565300150111365300210112865300420114965300220119165300240121370000330123770000210127070000190129170000200131070000220133010452552023-06-12       2001    bl uuuu     u00u1 u    #d1 aPRIMAVESI, A. C. P. de A.  aEffect of sources and rates of nitrogen on nutrients extraction in coastcross pastures.h[electronic resource]  aIn: INTERNATIONAL GRASSLAND CONGRESS, 19., 2001, São Pedro, SP. Proceedings... Piracicaba: FEALQc2001  ap. 192-193.  aThe contents and the extraction of mineral nutrients were determined in a coastcross pastures established on a dark red lotosol (Hapludox), in Sao Carlos, SP, Brazil, under tropical altitude climate, receving five rates of urea and ammonium nitrate, applied on surface. There weredifference (P&lt0.05) among sources and rates of N. Nutrients extractionincreased with the nitrogen lelves. Especial high werw total N (319 and 446 kg ha) and K (341 and 467 kg ha) extraction. When forage yield was high (treatment with 500 kg of N ha) and for both fertilizers, macronutrientns extraction was greater for K and, followed by Ca, S. PandMg. Micronutrients extraction ocurred in the following decreasing order: Fe, Mn Zn and Cu.  aammonium nitrate  aurea  aAplicacao de superficie  aCoastcross  aExtracao mineral  aMineral extraction cynodon dactlon cv  aNitrato de amonia  aSurface application1 aPRIMAVESI, O. M. A. S. P. R.1 aCORREA, L. de A.1 aCANTARELLA, H.1 aSILVA, A. G. da1 aFREITAS, A. R. de