02031nam a2200181 a 450000100080000000500110000800800410001910000230006024501010008326002880018452012790047265000130175165000170176465000160178165000110179770000230180870000180183118790732013-04-01       2010    bl uuuu     u00u1 u    #d1 aCARVALHO, M. C. S.  aTiming of nitrogen fertilizer application in no-tillage cotton in Brazil.h[electronic resource]  aIn: WORLD FERTILIZER CONGRESS OF THE INTERNATIONAL SCIENTIFIC CENTRE FOR FERTILIZERS, 15., 2010, Bucharest. Meeting the fertilizer demand on a changing globe: biofuels, climate change, and contaminants. Bucharest: Academiei Române: The Publishing House of the Romanian Academyc2010  aThis study aimed at evaluating the agronomic efficiency of nitrogen (N) fertilizers blended with urease inhibitor, nitrification inhibitor, and a slow-release polymer applied at different times in a no-till cotton crop as well as the possibility of reducing the number of broadcast applications using conventional and alternative N sources. The experiment was carried out in a complete randomized block design with four replications, in a (6x4)+1 factorial arrangement: six N sources (ammonium nitrate; urea; 50% urea + 50% ammonium sulfate; urea + urease inhibitor - NBPT; urea + slow-release polymer; and ammonium sulfonitrate + nitrification inhibitor - dimetil pirazol phosphate), four times of broadcast application (100% right after emergence; 50% right after emergence + 50% in phase B1 - first floral bud; 100% in phase B1; and 50% in phase B1 + 50% in phase F1 - first flower), and one control. None of the alternative N sources tested resulted in yields higher than the conventional sources (urea, ammonium nitrate, and ammonium sulfate). The highest yield was achieved when the N was applied earlier and split into two applications (50% right after emergence + 50% in phase B1). Single N application was more efficient only when using urea + slow-release polymer.  aAlgodão  aFertilizante  aNitrogênio  aUrease1 aFERREIRA, A. C. B.1 aSANTOS, F. C.