Effect of sources and rates of nitrogen on nutrients extraction in coastcross pastures.

PRIMAVESI, A. C. P. de A.; PRIMAVESI, O. M. A. S. P. R.; CORREA, L. de A.; CANTARELLA, H.; SILVA, A. G. da; FREITAS, A. R. de

Effect of sources and rates of nitrogen on nutrients extraction in coastcross pastures.

Autores

PRIMAVESI, A. C. P. de A.

PRIMAVESI, O. M. A. S. P. R.

Descripción

The 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<0.05) 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.

Palabras clave

Mineral extraction cynodon dactlon cv, Surface application, Extracao mineral, Coastcross, Aplicacao de superficie, Nitrato de amonia, ammonium nitrate, urea